1D:CollectingTheNecessaryData - Versionsgeschichte

Barbara: /* Surface transfer coefficients */

2009-03-10T09:41:14Z

Surface transfer coefficients

← Nächstältere Version		Version vom 10. März 2009, 11:41 Uhr
Zeile 89:		Zeile 89:
	==Surface transfer coefficients==		==Surface transfer coefficients==

	~~<P>~~
	These quantities specify the coupling between the climate data and the		These quantities specify the coupling between the climate data and the
	conditions in the building component:		conditions in the building component:
Zeile 122:		Zeile 121:

	<P>		<P>

	==Initial conditions==		==Initial conditions==

Barbara: /* Surface transfer coefficients */

2009-03-10T09:40:52Z

Surface transfer coefficients

← Nächstältere Version		Version vom 10. März 2009, 11:40 Uhr
Zeile 88:		Zeile 88:

	==Surface transfer coefficients==		==Surface transfer coefficients==
	~~</P>~~
	<P>		<P>
	These quantities specify the coupling between the climate data and the		These quantities specify the coupling between the climate data and the
Zeile 122:		Zeile 122:

	<P>		<P>
	* initial conditions		==Initial conditions==
	~~</P>~~
	* The temperature field must be initialised with <B>constant temperature across the component</B> or with an <B>initial temperature profile</B> (such as from measurements or previous simulations). Any profiles must be provided in a separate ASCII file.<BR>		* The temperature field must be initialised with <B>constant temperature across the component</B> or with an <B>initial temperature profile</B> (such as from measurements or previous simulations). Any profiles must be provided in a separate ASCII file.<BR>
	* The moisture field must be initialised with <B>constant relative humidity</B> across the component or with <B>individual mean moisture contents for each layer</B> or with an <B>initial moisture profile</B> (such as from measurements or previous simulations). Any profiles must		* The moisture field must be initialised with <B>constant relative humidity</B> across the component or with <B>individual mean moisture contents for each layer</B> or with an <B>initial moisture profile</B> (such as from measurements or previous simulations). Any profiles must be provided in a separate ASCII file.<BR>
	be provided in a separate ASCII file.<BR>
	<BR>		<BR>

	~~<P>~~
	The initial conditions are further discussed in the help topic for the		The initial conditions are further discussed in the help topic for the
	[[1D:Dialog_InitialConditions \| dialog "Initial Conditions"]].		[[1D:Dialog_InitialConditions \| dialog "Initial Conditions"]].
	</P>		</P>

Barbara: /* Climate data */

2009-03-10T09:37:35Z

Climate data

← Nächstältere Version		Version vom 10. März 2009, 11:37 Uhr
Zeile 49:		Zeile 49:
	== Climate data ==		== Climate data ==

	~~<P>~~
	These quantities define the boundary conditions at the interior and exterior		These quantities define the boundary conditions at the interior and exterior
	surfaces of the building component:		surfaces of the building component:

Barbara: /* Climate data */

2009-03-10T09:37:04Z

Climate data

← Nächstältere Version		Version vom 10. März 2009, 11:37 Uhr
Zeile 87:		Zeile 87:

	<P>		<P>

	==Surface transfer coefficients==		==Surface transfer coefficients==
	</P>		</P>

Barbara: /* Climate data */

2009-03-10T09:36:30Z

Climate data

← Nächstältere Version		Version vom 10. März 2009, 11:36 Uhr
Zeile 48:		Zeile 48:
	<P>		<P>
	== Climate data ==		== Climate data ==
	~~</P>~~
	<P>		<P>
	These quantities define the boundary conditions at the interior and exterior		These quantities define the boundary conditions at the interior and exterior
Zeile 87:		Zeile 87:

	<P>		<P>
	* surface transfer coefficients		==Surface transfer coefficients==
	</P>		</P>
	<P>		<P>

Len: Die Seite wurde neu angelegt: = Collecting the Necessary Data =
Of course, WUFI needs some data to perform the calculations. However, the equations built into WUFI have been formulated in terms...

2008-08-08T12:03:01Z

Die Seite wurde neu angelegt: = Collecting the Necessary Data = Of course, WUFI needs some data to perform the calculations. However, the equations built into WUFI have been formulated in terms...

Neue Seite

= Collecting the Necessary Data =


Of course, WUFI needs some data to perform the calculations. However, the equations
built into WUFI have been formulated in terms of quantities that are well known or
readily available or can easily be measured or estimated.


This is what WUFI needs:

== Material data ==
these quantities define the hygrothermal behaviour of the materials:

=== ''Basic Data:'' ===

* bulk density [kg/m³], 
* porosity [m³/m³], 
* specific heat capacity of dry material [J/kgK], 
* thermal conductivity of dry material [W/mK], 
* water vapor diffusion resistance factor of dry material [-] 
  

=== ''Hygric Extensions:'' ===

* moisture storage function [kg/m³] as a [[Glossary:Glossary-1D | table]] or [[Glossary:Glossary-1D | approximated]] using sorption moisture at 80% RH (w80) and free saturation (wf), 
* liquid transport coefficient for suction [m²/s] as a [[Glossary:Glossary-1D | table]] or [[Glossary:Glossary-1D | generated]] from the water absorption coefficient (A-value), 
* liquid transport coefficient for redistribution [m²/s] as a [[Glossary:Glossary-1D | table]] or [[Glossary:Glossary-1D | generated]] from the water absorption coefficient (A-value), 
* moisture-dependent thermal conductivity [W/mK], if necessary as a [[Glossary:Glossary-1D | table]] or [[Glossary:Glossary-1D | generated]] from the moisture-induced thermal conductivity supplement, 
* moisture-dependent vapor diffusion resistance factor [-], if necessary as a [[Glossary:Glossary-1D | table]]. 


These material data are further discussed in [[Details:Material | Reference: Material Data]].


The definition of the water vapor diffusion resistance factor (a.k.a.
µ-value) and related quantities is discussed in [[Details:WaterVaporDiffusion | Reference: Water Vapor Diffusion]].


For mathematical reasons, the basic data are required as a minimum
for each calculation; otherwise, the transport equations are not fully
defined. 
The hygric extensions are refinements of the simulation model that
may be necessary to fully and appropriately describe the hygrothermal
situation under investigation. 
  



== Climate data ==


These quantities define the boundary conditions at the interior and exterior
surfaces of the building component:

* rain load on the surface [Ltr/m²h], as dependent on the inclination and orientation of the building component, 
* short-wave (solar) radiation flux density [W/m²], as dependent on the inclination and orientation of the building component, 
* exterior air temperature [°C], 
* exterior relative humidity (0..1), 
*interior air temperature [°C], 
* interior relative humidity (0..1), 
* mean barometric pressure [hPa] over the calculation period, 
* atmospheric counterradiation [W/m²], if radiation cooling is to be accounted for during the night. 
  


For each time step, WUFI reads these data from a climate file. Since the rain
load and the radiation flux are directional quantities, they must be evaluated
in dependence of the orientation and inclination of the building element.
This evaluation can be done with a preprocessor or by WUFI itself during the
calculation.


In the former case, the processed data are written to a file of
[[Details:KLI-File | *.KLI]] type, in the latter case
WUFI expects climate data in [[Details:WET-File | *.WET]] or
[[Details:TRY-File | *.TRY]] or [[Details:DAT-File | *.DAT]] or
[[Details:WAC-File | *.WAC]] or [[Details:IWC-File | *.IWC]] or
[[Details:WBC-File | *.WBC]] format. 
You can create files with your own data in any of these formats in order to
use them with WUFI.


Climate data and the climate file formats are further discussed in
[[Details:Climate | Reference: Climate Data]].



* surface transfer coefficients


These quantities specify the coupling between the climate data and the
conditions in the building component:


* heat transfer resistance [m²K/W] for interior and exterior surface, respectively. The heat transfer resistance is the reciprocal of the heat transfer coefficient which may be more familiar to some users, 
* vapor diffusion thickness, a.k.a. sd-value [m] for interior and exterior surface, respectively; allows to account for the diffusion-retarding effect of paint coats, wallpapers, vapor retarders etc., if present, without the need to explicitly include these layers in the component assembly, 
* short-wave (solar) radiation absorptivity [-], 
* long-wave (thermal) radiation emissivity [-] (must often be neglected, since data on sky and ground counterradiation are rarely available), 
* rain reduction factor [-] describes the reduction of rain water volume available for suction on non-horizontal surfaces, since some water splashes off on impact. 


The water vapor transfer coefficients are automatically calculated from
the heat transfer resistances and need not be specified separately.


The coefficients listed here are further discussed in
[[Details:Surface | Reference: Surface Transfer
Coefficients]].


The definition of the vapor diffusion thickness and related quantities is
discussed in [[Details:WaterVaporDiffusion | Reference: Water Vapor
Diffusion]].


WUFI offers lists of predefined common values of these coefficients for
selection, but you may enter user-defined values as well.



* initial conditions

* The temperature field must be initialised with constant temperature across the component or with an initial temperature profile (such as from measurements or previous simulations). Any profiles must be provided in a separate ASCII file. 
* The moisture field must be initialised with constant relative humidity across the component or with individual mean moisture contents for each layer or with an initial moisture profile (such as from measurements or previous simulations). Any profiles must
be provided in a separate ASCII file. 
  


The initial conditions are further discussed in the help topic for the
[[1D:Dialog_InitialConditions | dialog "Initial Conditions"]].

1D:CollectingTheNecessaryData - Versionsgeschichte

Barbara: /* Surface transfer coefficients */

Barbara: /* Surface transfer coefficients */

Barbara: /* Climate data */

Barbara: /* Climate data */

Barbara: /* Climate data */

Len: Die Seite wurde neu angelegt: = Collecting the Necessary Data = Of course, WUFI needs some data to perform the calculations. However, the equations built into WUFI have been formulated in terms...

Len: Die Seite wurde neu angelegt: = Collecting the Necessary Data =
Of course, WUFI needs some data to perform the calculations. However, the equations built into WUFI have been formulated in terms...