This is assessed by comparing the electricity and heat generation of each roof design to those of the gable roof.
The largest south roof area is obtained with the larger side angle (90[degrees]) corresponding to a gable roof (Figure 6).
For instance, configuration 1 (with 15[degrees] orientation) exceeds annual electricity generation of the gable roof by 17% and heat generation for the assumed heating period by 15%.
Results of Energy Potential of the Multi-Faceted Roof Design Options in International System of Units (SI) Roof Options Annual Heat Combined Electricity Generation Generation Generation (Heating (kWh/yr) (kWh/yr) Period) (kWh/yr) Gable roof 7561 10068 17629 15[degrees] 8815 11544 20358 (E,W),40 [degrees] Split-roofs 30[degrees] 8636 11169 19806 (E,W),40 [degrees] Conf.
Furthermore, this roof shape has significantly higher south facing surface area than the gable roof (see Table 3).
For instance, the heating load required for the housing unit with gable roof (reference case) is approximately 5% larger than for the unit with hip roof of 45[degrees] side angle.
Comparison of the Effect of Roof Shapes on Heating and Cooling, for the Rectangular Shape and the Redesigned Shapes Comparison to the 45[degress] Hip Roof Comparison to Gable Roof (Reference Case) Rectangular Redesigned Rectangular Unit Units Unit Heating Cooling Heating Cooling Heating Split-roof Conf.
Results of the comparison of the redesigned units associated with each roof configuration, to the rectangular unit with 45[degrees] hip and with gable roof (reference), are presented in Table 5.
The rectangle with gable roof produces some 2% more than it consumes.
Ratio of Energy Production to Consumption Hip Roof Split-Roof Gable Roof Side Angle = Config.