1D:Dialog SurfaceTransferCoefficients - Versionsgeschichte

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T10:16:31Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 12:16 Uhr
Zeile 63:		Zeile 63:
	<B>"Interior Surface":</B>		<B>"Interior Surface":</B>

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]][W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.  <BR> The normal [Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the ~~s<SMALL>d</SMALL>~~-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the sd-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	For all of these coefficients WUFI offers you predefined values which you can select from		For all of these coefficients WUFI offers you predefined values which you can select from

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T10:11:20Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 12:11 Uhr
Zeile 37:		Zeile 37:
	<BR>		<BR>
	* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>		* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>
	* The [[Details:LongWave \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:HeatTransfer \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:LongWaveExchange \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:LongWaveExchange \| explicit radiation balance]], you can enable this mode here and set some parameters:<br>  <BR>		* The [[Details:LongWave \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:HeatTransfer \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:LongWaveExchange \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:LongWaveExchange \| explicit radiation balance]], you can <B>enable</B> this mode here and set some parameters:<br>  <BR>
	[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]		[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T10:07:45Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 12:07 Uhr
Zeile 34:		Zeile 34:
	topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the component [[1D:Dialog_Assembly \| assembly]].<br>  <BR> If there is no such coating on your building component, or any coating has been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the ~~s<SMALL>d</SMALL>~~-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| ~~reference:~~ Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the component [[1D:Dialog_Assembly \| assembly]].<br>  <BR> If there is no such coating on your building component, or any coating has been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the sd-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>		* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T10:04:51Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 12:04 Uhr
Zeile 34:		Zeile 34:
	topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| ~~component~~ assembly]].<br>  <BR> If there is no such coating on your building component, or any coating ~~<I>~~has~~</I>~~ been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the component [[1D:Dialog_Assembly \| assembly]].<br>  <BR> If there is no such coating on your building component, or any coating has been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>		* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T10:02:15Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 12:02 Uhr
Zeile 18:		Zeile 18:
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  α = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:WAC-File \| WAC]] and [[Details:WBC-File \| WBC]] Format:</B><br> Same method as with TRY if the file contains wind direction and wind speed (scalar or vectorial). Otherwise, no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>  <BR>		** <B>[[Details:WAC-File \| WAC]] and [[Details:WBC-File \| WBC]] Format:</B><br> Same method as with TRY if the file contains wind direction and wind speed (scalar or vectorial). Otherwise, no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>  <BR>
	** <B>[[Details:KLI-File \| KLI]] format:</B><br> This format does not contain any information about wind speed or direction, so that no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>		** <B>[[Details:KLI-File \| KLI]] format:</B><br> This format does not contain any information about wind speed or direction, so that no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T09:57:45Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 11:57 Uhr
Zeile 16:		Zeile 16:

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br> &~~nbsp~~;~~<BR>  <FONT FACE="SYMBOL">a</FONT>~~ = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>

Barbara: /* Dialog: Surface Transfer Coefficients */

2009-03-23T09:50:21Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 23. März 2009, 11:50 Uhr
Zeile 16:		Zeile 16:

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the []1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>

Len: /* Dialog: Surface Transfer Coefficients */

2008-09-30T09:15:01Z

Dialog: Surface Transfer Coefficients

← Nächstältere Version		Version vom 30. September 2008, 11:15 Uhr
Zeile 32:		Zeile 32:
	This option becomes relevant if you want to do a computation with full long-wave		This option becomes relevant if you want to do a computation with full long-wave
	radiation balance (otherwise, it is not enabled). For details please refer to the help		radiation balance (otherwise, it is not enabled). For details please refer to the help
	topic [[Details:LongWaveExchange. \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>

Len am 30. September 2008 um 09:14 Uhr

2008-09-30T09:14:11Z

← Nächstältere Version		Version vom 30. September 2008, 11:14 Uhr
Zeile 32:		Zeile 32:
	This option becomes relevant if you want to do a computation with full long-wave		This option becomes relevant if you want to do a computation with full long-wave
	radiation balance (otherwise, it is not enabled). For details please refer to the help		radiation balance (otherwise, it is not enabled). For details please refer to the help
	topic [[Details:~~LongwaveRadiationExchange~~. \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongWaveExchange. \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>		* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>
	* The [[Details:LongWave \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:HeatTransfer \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:~~LongWaveRadiationExchange~~ \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:~~LongWaveRadiationExchange~~ \| explicit radiation balance]], you can enable this mode here and set some parameters:<br>  <BR>		* The [[Details:LongWave \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:HeatTransfer \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:LongWaveExchange \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:LongWaveExchange \| explicit radiation balance]], you can enable this mode here and set some parameters:<br>  <BR>
	[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]		[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]

Zeile 54:		Zeile 54:

	For further details on these parameters, please refer to the		For further details on these parameters, please refer to the
	topic [[Details:~~LongWaveRadiationExchange~~ \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongWaveExchange \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>

Len am 16. September 2008 um 06:36 Uhr

2008-09-16T06:36:06Z

← Nächstältere Version		Version vom 23. März 2009, 12:02 Uhr
Zeile 18:		Zeile 18:
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  α = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:WAC-File \| WAC]] and [[Details:WBC-File \| WBC]] Format:</B><br> Same method as with TRY if the file contains wind direction and wind speed (scalar or vectorial). Otherwise, no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>  <BR>		** <B>[[Details:WAC-File \| WAC]] and [[Details:WBC-File \| WBC]] Format:</B><br> Same method as with TRY if the file contains wind direction and wind speed (scalar or vectorial). Otherwise, no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>  <BR>
	** <B>[[Details:KLI-File \| KLI]] format:</B><br> This format does not contain any information about wind speed or direction, so that no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>		** <B>[[Details:KLI-File \| KLI]] format:</B><br> This format does not contain any information about wind speed or direction, so that no wind-dependent heat transfer coefficient can be determined, and WUFI simply uses the value in the text box.<br>

← Nächstältere Version		Version vom 23. März 2009, 11:57 Uhr
Zeile 16:		Zeile 16:

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br> &~~nbsp~~;~~<BR>  <FONT FACE="SYMBOL">a</FONT>~~ = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  ~~<FONT FACE="SYMBOL">a</FONT>~~ = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br />α = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  α = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>

← Nächstältere Version		Version vom 23. März 2009, 11:50 Uhr
Zeile 16:		Zeile 16:

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the []1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the [[1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
	** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:WET-File \| WET]] format:</B><br> Instead of a general mean wind direction, the WET format offers detailed information about the frequency of different wind directions during the hourly measurement interval.<br>  <BR> If the [[1D:Dialog_Orientation \| inclination]] of the component is less than 10° (i.e. permanent windward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else:<br>  <FONT FACE="SYMBOL">a</FONT> = weight_windward * (1.6 * v_wind + 4.5 + 6.5) + weight_leeward * (0.33 * v_wind + 4.5 + 6.5) [W/m²K].<br>  <BR> The weighting factor weight_windward is the sum of the components of the measured wind directions perpendicular to the component surface and weighted according to their duration.<BR>  <BR> Weight_leeward is (1 - weight_windward).<BR>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>

← Nächstältere Version		Version vom 16. September 2008, 08:36 Uhr
Zeile 15:		Zeile 15:
	</P>		</P>

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:~~HeatTransferCoefficients~~ \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]] [W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<br>  <BR> You can select between a constant coefficient (which is sufficient for most cases) and a wind-dependent coefficient.<br>  <BR> If you have activated the option <B>"wind-dependent"</B>, WUFI determines the heat transfer coefficient as follows, in dependence of the format of the selected [[Details:Climate \| climate file]]:<br>  <BR>
	** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the []1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>		** <B>[[Details:TRY-File \| TRY]] and [[Details:IWC-File \| IWC]] format:</B><br> If the []1D:Dialog_Orientation \| inclination]] of the component is greater than 10° and the surface of the component is [[1D:Dialog_Orientation \| facing away]] from the mean wind direction (i.e. leeward conditions):<br>  <BR>  <FONT FACE="SYMBOL">a</FONT> = 0.33 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> Else (windward conditions):<br>  <FONT FACE="SYMBOL">a</FONT> = 1.6 * v_wind + 4.5 + 6.5 [W/m²K].<br>  <BR> 4.5 W/m²K is the convective heat transfer coefficient for v_wind = 0 m/s and 6.5 W/m²K ist the radiative component.<BR>  <BR>
	** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>		** <B>[[Details:DAT-File \| DAT]] format:</B><br> Same method as with TRY, but DAT files may also indicate variable wind (wind direction "999"). In this case, the average of leeward and windward conditions is used.<br>  <BR>
Zeile 28:		Zeile 28:
	<B>"includes long-wave radiation part":</B><BR>		<B>"includes long-wave radiation part":</B><BR>
	With this checkbox you can tell WUFI whether the user-defined heat resistance		With this checkbox you can tell WUFI whether the user-defined heat resistance
	you entered contains a [[Details:~~HeatTransferCoefficients~~ \| component due to long-wave radiation]]		you entered contains a [[Details:HeatTransfer \| component due to long-wave radiation]]
	or not. All the predefined values in the drop-down list contain such a component.<BR>		or not. All the predefined values in the drop-down list contain such a component.<BR>
	This option becomes relevant if you want to do a computation with full long-wave		This option becomes relevant if you want to do a computation with full long-wave
Zeile 34:		Zeile 34:
	topic [[Details:LongwaveRadiationExchange. \| Long-Wave Radiation Exchange]].<BR>		topic [[Details:LongwaveRadiationExchange. \| Long-Wave Radiation Exchange]].<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:~~WaterVaporTransferCoefficients~~ \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.<br>  <BR> The normal [[Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	* The [[Details:~~ShortWaveRadiationAbsorptivity~~ \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>		* The [[Details:ShortWave \| <B>"Short-Wave Radiation Absorptivity [-]"</B>]],<BR> which determines the fraction of total incident (short-wave) solar radiation that is absorbed by the component.<br>  <BR>
	* The [[Details:~~LongWaveRadiationEmissivity~~ \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:~~HeatTransferCoefficients~~ \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:LongWaveRadiationExchange \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:LongWaveRadiationExchange \| explicit radiation balance]], you can enable this mode here and set some parameters:<br>  <BR>		* The [[Details:LongWave \| <B>"Long-Wave Radiation Emissivity [-]"</B>]],<BR> which describes the efficiency of long-wave emission (heat loss by thermal radiation).<br>  <BR> In building physics, the long-wave radiation exchange between the component and its surroundings is usually accounted for by appropriately increasing the [[Details:HeatTransfer \| heat transfer coefficient]]. This is accurate enough for most applications, only details like nighttime radiative cooling and subsequent dew deposition and mold growth risk cannot be handled this way.<br>  <BR> <I>If you can do without nighttime cooling, we recommend to set the long-wave emissivity to zero.</I><br>  <BR> Otherwise, enter the emissivity of the component's surface. But then you must make sure that WUFI is working in the appropriate calculation mode and that you are using appropriate weather data (including, in particular, data on the long-wave radiation exchange). For details, see the topic [[Details:LongWaveRadiationExchange \| Long-wave Radiation Exchange]]. Because of the relatively large amounts of energy involved in the long-wave exchange, insufficient attention to these details may produce very inaccurate results.<br>  <BR> If you want WUFI to work in the calculation mode with [[Details:LongWaveRadiationExchange \| explicit radiation balance]], you can enable this mode here and set some parameters:<br>  <BR>
	[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]		[[Bild:DialogExpliziteStrahlungsbilanz_en_03.gif]]

Zeile 63:		Zeile 63:
	<B>"Interior Surface":</B>		<B>"Interior Surface":</B>

	* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:~~HeatTransferCoefficients~~ \| heat transfer coefficient]][W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<BR>		* The <B>"Heat Resistance [m²K/W]"</B> (the reciprocal of the [[Details:HeatTransfer \| heat transfer coefficient]][W/m²K]),<BR> which governs the convective and (long-wave) radiative heat exchange between the component and the surroundings.<BR>
	<BR>		<BR>
	* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.  <BR> The normal [Details:~~WaterVaporTransferCoefficients~~ \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>		* The [[Details:SurfaceCoatings \| <B>"Sd-value [m]"</B>]],<BR> of a surface 'coating' (if present), such as a paint coat, wallpaper, [[Details:Membranes \| vapor retarder]], weathered surface zone etc. This allows to account for the diffusion-retarding effect of such a 'coating' without the need to explicitly include the possibly very thin layer in the [[1D:Dialog_Assembly \| component assembly]].<br>  <BR> If there is no such coating on your building component, or any coating <I>has</I> been included in the [[1D:Dialog_Assembly \| assembly]] as a separate layer, select <B>"No coating"</B>.  <BR> The normal [Details:WaterVaporTransfer \| water vapour transfer resistance]] which is due to the boundary air layer is always automatically allowed for by WUFI and need not be included in the s<SMALL>d</SMALL>-value.<br>  <BR> Please refer to [[Details:SurfaceCoatings \| reference: Surface Coatings]] for further details on the use of this option.<BR>
	<BR>		<BR>
	For all of these coefficients WUFI offers you predefined values which you can select from		For all of these coefficients WUFI offers you predefined values which you can select from