Heat loss in basement depends on many different variables. One of them ground temperature, which functions as outdoor design temperature in the heat loss transmission formula. The ground temperatures vary by geographical location.
The usual method for calculating heat loss transmission through basement walls is to view them as being divided into 2 (two) sections. The upper section extends from the frost line to the basement ceiling and includes portions of the wall that are exposed to outdoor air temperatures. The heat loss for the upper section is calculated the same way that other surfaces exposed to the outside temperature are calculated.
The lower section, the wall extending from the frost line to the basement floor and the floor itself can be calculated on the basis of the ground temperature. The ground temperature is substituted for the outside design temperature when calculating heat loss.
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