By applying the proposed pattern based on optimal physical features of a
building, the total amount of energy consumption in a year in Sample B
was reduced to 91.5 KWH. Such a reduction shows the direct effect of
optimal physical condition on thermal performance of buildings.
Subsequently, indicating the size of openings in a building is of
considerable importance; these openings can be a means for both
receiving and wasting energy. Therefore, the specification of the total
area of windows (regarding the type of the examined climate, it is
effective as a main index) gains substantial significance. The optimal
percentages of openings based on length-to-width ratio in Ilam City’s
climate are listed in Table 9, with regards to the proposed optimal
pattern.
Table 9.: The extent of the transparency of openings and the
building plan’s length-to-width ratio in Ilam City’s climate (%).