In Germany there are the following regulations: Detailled procedure:

Correction 0,1 W/m²K - without consideration of the building element connections from the building side

Correction 0,05 W/mfK - with consideration of the building element connection from the construction side, that means sample constructions are respected according to DIN 4108 / supplement 2

Simplified procedure:

Correction 0,1 W/m2K - without consideration of the building element connections

Heat transmission coefficient

The heat transmission coefficient of a building element results ac­cording to the U-value calculation and is shown for the control at the registration of the room surrounding surface.

For a building element which borders on earth the equivalent U-value is calculated and shown according to EN 13370. In this case the shorthand expression Ueq stands in front of the real value.

If the correction of the U-value through the thermal bridge extra charge fc has been agreed on, then the corrected U-value is shown in this column. The shorthand expression Uc stands in front of the real value.

Temperature on the building element out­side

At exterior building elements the exterior design temperature is registered according to standard, at interior building elements it depends if the building element borders on a heated or an unheated room.

At earth touched building elements no temperature is shown at the neighbouring side.

Principally the temperature must be shown on the neighbouring side of the building element at normal heating operation.

Note:

At building elements which border on heated or un­heated rooms the adjacent room can be chosen or entered. With it the temperature is also established. With the procedure the building element is automati­cally entered into the room to which it is referred. Changes at the building element have the same ef­fect.

Correction factor

For the calculation of the transmission heat losses first the trans­mission heat loss coefficients are calculated. Then these values are multiplied by the highest temperature difference (interior-minus exterior temperature). This procedure requires a tempera­ture reduction factor (correction factor) for each room limiting sur­face which does not border on exterior air which is calculated from the temperature balance.

The following correction factors are distinguished:

• fi at a building element which borders on a heated room

• bu at a building element which borders on an unheated room

• fg2 at a building element which borders on earth

Furthermore at exterior building elements the weather conditioned correction factors ek respectively el are distinguished.

For each room limiting surface the necessary correction factor is calculated and shown. The corresponding shorthand expression (ek, el, fi, bu or fg2) stands in front of the real value.

«- Note:

If a building element borders on an unheated room and the temperature of the unheated room is not known, then the correction factor has to be chosen by hand by certain construction characteristics of the unheated room.

Heat loss coefficient

The transmission heat loss coefficient of building elements is cal­culated from the building element surface, the U-value and the temperature correction factor. This value is now a calculation re­sult and cannot be edited directly. It is indicated in the unit W/K and cannot be mixed with the transmission heat loss.

Edge insulation

At base slabs at earth it has to be defined first if edge insulation exists or not. If that is the case, it can be chosen between vertical and horizontal edge insulation. In these cases the features of the edge insulation (thickness, depth, heat conductivity) have to be indicated.

Thickness, depth and heat conductivity of the edge insulation

A base slab on earth can be equipped with an edge insulation which is allocated either horizontally or vertically around the vol­ume of the base slab. Besides the real thickness of the insulation the thickness respectively depth and the heat conductivity of the insulation material must be indicated.

Exposed volume of the base slab

For the calculation of the exposed volume P only the lengths of the earth touched exterior walls are applied. If the option from room surrounding is marked, the program automatically calcu­lates the lengths of the walls which border on exterior air or on unheated rooms and adds them to the exposed volume. If the marking has not been set, then the value cannot be entered by hand.

In the following cases the exposed volume of the entire earth touched base slab of the building has been applied for the calcu­lation of the characteristic base slab dimension B':

• at inside lying rooms (they have no exterior wall which borders on earth )

• if Vfloor + correction factor fc < 0,5 W/m²K

In these cases the field of the room heating surface cannot be ed­ited, but the P-value of the building is here automatically entered from the common data.

In all other cases the room by room separate calculation of the B'-value takes place; that mans that the exposed volume of the room has to be applied.