Plus:Dialog Climate

Dialog: Climate

At its surfaces the building component is exposed to the climatic boundary conditions which have a profound effect on its hygrothermic and inner climate behaviour. As discussed in the help topic Climate data, WUFI needs for each time step data on the rain and radiation load, on the exterior and interior temperature and on the exterior and interior relative humidity.

The designed building in WUFI-Plus has on the outer facade contact to the external climate. Each of the surfaces of the components must be assigned its respective boundary conditions. But here it is possible to assign a external climate or an optional climate.

External Climate

The boundary conditions may be given as

• hourly data read from a climate file (describing an exterior climate),
• hourly interior conditions (describing an interior climate) derived from an exterior climate file through an appropriate model,
• schematic yearly sine curves (describing an exterior or interior climate).

The adjacently climates on the different components may be assigned only for the outside surface of the component. The boundary condition on the outside of the component have not to be an external climate. If the heated zone of the building is boardering to another flat or room the external climate can be change to an optional climate.

"Fom Map (Database)":

Choose this option if the boundary conditions are to be read from a climate file.

The button "Browse..." opens a dialog in which you can select the desired climate file on a map from a map.

Once you have selected a climate file, WUFI will plot the temperature and the relative humidity. The thin curves show the data read from the climate file, the bold curves represent the centered moving monthly means for easier visual accessibility.
 

If you have assigned the climate file to the outside of the building you may also have a climate analysis performed.

Click on the button "Analyze" to start the analysis. WUFI will display the minimum, maximum and mean values of temperature and relative humidity, the normal (i.e. vertical) rain sum and the directional distributions of solar radiation and driving rain:
The radiation rose shows the yearly sum of global radiation for receiving surfaces with different orientations and inclinations, the driving rain rose shows the yearly sum of driving rain on free-standing vertical surfaces ( R2 = 0.2 s/m) with different orientations.

These data will give you an overview of the most important characteristics of the selected climate file. In particular, the radiation and rain roses show the directions from which the radiation and rain loads on the facade are mainly to be expected.

*.KLI files can not be analyzed, since their radiation and rain data have already been converted for a fixed orientation and inclination.
The analysis of *.WET files is independent of any options you may have selected in the "Details..." subdialog; that is, the temperature analysis always reads the air temperature from the file, the radiation analysis always reads the global and diffuse radiation on a horizontal surface and the driving rain analysis always reads the normal rain and the wind speed and direction.
 

"Userdefined file":

Choose this option if you want to use a Userdefined file. With the button "Browse..." you can select the directory. WUFI can read:

• .wet
• .try
• .dat
• .wac
• .iwc
• .wbc
• .kli

If your weather file is in .txt format you have to load it with "Files / Measured Data" and define it as an optional climate.

Optional Climate

There are several ways to define or select a climate. By clicking on "New" a new optional climate it created. In the drop-down menu can be selected among several options for defining the climate. "File based" refers to a previously in "Files/Measured Data" uploaded climate file. Simple temperature and moisture profiles can be specified as a sine curve. The generation of an internal climate of the selected outdoor air is possible.

The file-based climate must now be assigned the appropriate parameters. Therefore, the previously stored data in "Files/Measured Data" will be selected. For an optional climate after a sine curve, the user has several predefined curves for temperature and relative humidity available. The curves can also be user defined. This selection is taken on a drop-down menu. The climates in accordance with EN 13 788 (DIN EN ISO 13788 2001), EN 15025 (EN 15026 2007) or ASHRAE 160 (ANSI / ASHRAE 160 2009) are derived from the respective standards. For the EN 13 788, the indoor temperature and humidity different classes are determined. Similarly, the climate to EN 15026 allows a choice of moisture load. The parameters that can be determined by ASHRAE 160 are extensive. In the field of temperature, the type of climate control is selected. Set values must be specified. The moisture can be determined by ASHRAE 160 to the number of bedrooms, or custom. In this selection, even an air exchange rate must be entered.