Details:BasicMaterialData - Versionsgeschichte

GauertV am 3. Juli 2009 um 08:10 Uhr

2009-07-03T08:10:42Z

← Nächstältere Version		Version vom 3. Juli 2009, 10:10 Uhr
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	V<small>tot</small> of the sample:		V<small>tot</small> of the sample:
	<math>\rho_{bulk} = m / V_{tot}</math>.<BR>		<math>\rho_{bulk} = m / V_{tot}</math>.<BR>
	~~<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>~~
	The true density ρ<small>true</small>, by		The true density ρ<small>true</small>, by
	contrast, is the ratio of the mass of the sample and the volume taken		contrast, is the ratio of the mass of the sample and the volume taken

GauertV am 3. Juli 2009 um 08:05 Uhr

2009-07-03T08:05:30Z

← Nächstältere Version		Version vom 3. Juli 2009, 10:05 Uhr
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	is the ratio of the mass m of the sample and the total volume		is the ratio of the mass m of the sample and the total volume
	V<small>tot</small> of the sample:		V<small>tot</small> of the sample:
	<math>rho_{bulk} = m / V_{tot}</math>.<BR>		<math>\rho_{bulk} = m / V_{tot}</math>.<BR>
	<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>		<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>
	The true density ρ<small>true</small>, by		The true density ρ<small>true</small>, by

GauertV am 3. Juli 2009 um 08:05 Uhr

2009-07-03T08:05:17Z

← Nächstältere Version		Version vom 3. Juli 2009, 10:05 Uhr
Zeile 15:		Zeile 15:
	is the ratio of the mass m of the sample and the total volume		is the ratio of the mass m of the sample and the total volume
	V<small>tot</small> of the sample:		V<small>tot</small> of the sample:
			<math>rho_{bulk} = m / V_{tot}</math>.<BR>
	<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>		<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>
	~~<math>rho_{bulk} = m / V_{tot}</math>.<BR>~~
	The true density ρ<small>true</small>, by		The true density ρ<small>true</small>, by
	contrast, is the ratio of the mass of the sample and the volume taken		contrast, is the ratio of the mass of the sample and the volume taken

GauertV am 3. Juli 2009 um 08:04 Uhr

2009-07-03T08:04:43Z

← Nächstältere Version		Version vom 3. Juli 2009, 10:04 Uhr
Zeile 16:		Zeile 16:
	V<small>tot</small> of the sample:		V<small>tot</small> of the sample:
	<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>		<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>
			<math>rho_{bulk} = m / V_{tot}</math>.<BR>
	The true density ρ<small>true</small>, by		The true density ρ<small>true</small>, by
	contrast, is the ratio of the mass of the sample and the volume taken		contrast, is the ratio of the mass of the sample and the volume taken

GauertV am 3. Juli 2009 um 08:03 Uhr

2009-07-03T08:03:34Z

← Nächstältere Version		Version vom 3. Juli 2009, 10:03 Uhr
Zeile 15:		Zeile 15:
	is the ratio of the mass m of the sample and the total volume		is the ratio of the mass m of the sample and the total volume
	V<small>tot</small> of the sample:		V<small>tot</small> of the sample:
	ρ<small>bulk</small> = m / V<small>tot</small>.<BR>		<math>ρ<small>bulk</small> = m / V<small>tot</small></math>.<BR>
	The true density ρ<small>true</small>, by		The true density ρ<small>true</small>, by
	contrast, is the ratio of the mass of the sample and the volume taken		contrast, is the ratio of the mass of the sample and the volume taken

Barbara: /* Basic Material Data */

2009-03-25T10:13:04Z

Basic Material Data

← Nächstältere Version		Version vom 25. März 2009, 12:13 Uhr
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	side of the specimen and condensing at the other side, thus		side of the specimen and condensing at the other side, thus
	in effect transporting latent heat without a corresponding		in effect transporting latent heat without a corresponding
	heat flow being conducted across the specimen). Since WUFI		heat flow being <I>conducted</I> across the specimen). Since WUFI
	explicitly computes this thermal effect of vapor flow, it		explicitly computes this thermal effect of vapor flow, it
	should not be included in the heat conductivity, if possible.		should not be included in the heat conductivity, if possible.
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	<BR>		<BR>
	On the other hand, hygrothermal simulations (in particular the		On the other hand, hygrothermal simulations (in particular the
	resulting moisture contents and distributions) usually don't depend		resulting <I>moisture</I> contents and distributions) usually don't depend
	very sensitively on the precise values of the heat conductivities,		very sensitively on the precise values of the heat conductivities,
	so the difference may be generally negligible unless you are		so the difference may be generally negligible unless you are
	specifically interested in heat flows.<BR>		specifically interested in <I>heat</I> flows.<BR>
	<BR>		<BR>

Barbara: /* Basic Material Data */

2009-03-25T10:09:40Z

Basic Material Data

← Nächstältere Version		Version vom 25. März 2009, 12:09 Uhr
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	the specific heat capacity by mass of the dry material.<BR>		the specific heat capacity by mass of the dry material.<BR>
	<BR>		<BR>
	Using the specific heat capacity by mass has the advantage that this		Using the specific heat capacity <I>by mass</I> has the advantage that this
	value only depends on the chemical composition of the material, but		value only depends on the chemical composition of the material, but
	not on its porosity. For example, cellular concrete bricks with		not on its porosity. For example, cellular concrete bricks with

Barbara: /* Basic Material Data */

2009-03-25T10:08:00Z

Basic Material Data

← Nächstältere Version		Version vom 25. März 2009, 12:08 Uhr
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	organic materials. In most cases, these estimates will be sufficient		organic materials. In most cases, these estimates will be sufficient
	since hygrothermal simulations usually don't depend very sensitively on		since hygrothermal simulations usually don't depend very sensitively on
	this value.~~<BR>~~		this value.


	WUFI automatically allows for the additional heat capacity of the		WUFI automatically allows for the additional heat capacity of the
	water content, if any.<BR>		water content, if any.<BR>

Barbara: /* Basic Material Data */

2009-03-25T10:06:30Z

Basic Material Data

← Nächstältere Version		Version vom 25. März 2009, 12:06 Uhr
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	different bulk density, if their bulk density and porosity are known.		different bulk density, if their bulk density and porosity are known.
	Example: a cellular concrete brick with ρ<small>bulk</small> = 600 kg/m³ and porosity = 0.72 has		Example: a cellular concrete brick with ρ<small>bulk</small> = 600 kg/m³ and porosity = 0.72 has
	~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> =		ρ<small>true</small> =
	600 / (1 - 0.72) kg/m³ = 2140 kg/m³. The porosity of a		600 / (1 - 0.72) kg/m³ = 2140 kg/m³. The porosity of a
	cellular concrete brick with ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~bulk</small> = 400 kg/m³ can then be estimated as		cellular concrete brick with ρ<small>bulk</small> = 400 kg/m³ can then be estimated as
	porosity = 1 - 400 / 2140 = 0.81.<BR>		porosity = 1 - 400 / 2140 = 0.81.<BR>
	<BR>		<BR>

Barbara: /* Basic Material Data */

2009-03-25T10:05:26Z

Basic Material Data

← Nächstältere Version		Version vom 25. März 2009, 12:05 Uhr
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	<BR>		<BR>
	The porosity can be estimated from the true density		The porosity can be estimated from the true density
	~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> and the bulk		ρ<small>true</small> and the bulk
	density ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~bulk</small>:<BR>		density ρ<small>bulk</small>:<BR>
	~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~bulk</small> = m / V<small>tot</small> = m / (V<small>true</small> + V<small>pores</small>) = <~~FONT FACE="SYMBOL"~~>~~r</FONT> ~~true</small> / (1 + V<small>pores</small>/V<small>true</small>) = ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> * V<small>true</small>/V<small>tot</small> = ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> * (1 - V<small>pores</small>/V<small>tot</small>) = ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> * (1 - porosity), therefore<BR>		ρ<small>bulk</small> = m / V<small>tot</small> = m / (V<small>true</small> + V<small>pores</small>) = ρ<small>true</small> / (1 + V<small>pores</small>/V<small>true</small>) = ρ<small>true</small> * V<small>true</small>/V<small>tot</small> = ρ<small>true</small> * (1 - V<small>pores</small>/V<small>tot</small>) = ρ<small>true</small> * (1 - porosity), therefore<BR>
	<BR>		<BR>
	<CENTER>porosity = 1 - ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~bulk</small> / ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small>.</CENTER>		<CENTER>porosity = 1 - ρ<small>bulk</small> / ρ<small>true</small>.</CENTER>
	<BR>		<BR>
	~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~true</small> can in turn be		ρ<small>true</small> can in turn be
	estimated from other materials which have the same composition but		estimated from other materials which have the same composition but
	different bulk density, if their bulk density and porosity are known.		different bulk density, if their bulk density and porosity are known.
	Example: a cellular concrete brick with ~~<FONT FACE="SYMBOL">r</FONT>~~<small>~~ ~~bulk</small> = 600 kg/m³ and porosity = 0.72 has		Example: a cellular concrete brick with ρ<small>bulk</small> = 600 kg/m³ and porosity = 0.72 has
	<FONT FACE="SYMBOL">r</FONT><small> true</small> =		<FONT FACE="SYMBOL">r</FONT><small> true</small> =
	600 / (1 - 0.72) kg/m³ = 2140 kg/m³. The porosity of a		600 / (1 - 0.72) kg/m³ = 2140 kg/m³. The porosity of a