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471Global J. Environ. Sci. Manage., 6(4): 467-480, Autumn 2020and energy settings were defined for each mass. Finally, the results of energy analysis were received after generating the energy model and sending the related file to the Autodesk cloud services. After considering the proposed building design in terms of cost of energy consumption and considering the items such as project location, site scope, building height, facilities and project cost, the first mode of the building form was selected for accurate modeling and energy analysis. Table 2 shows the comparison of different building forms.Several conceptual masses were first developed to study different design ideas. The closest modes to the actual model of the building and the items such as number of units and area of the building were considered in construction of concept models. Input parameters of the energy model were selected according to the default software (Table 3). The results of the analysis show that the first form of the building has the lowest energy consumption among others. The cost of energy consumption based on the parameters listed in Table 3 is 14 USD/m2/y. Accordingly, the energy consumption is equal to 113 kWh/m2/y (Table 2). In this form, the building orientation is based on the geographical north. Thus, the angle of the building is automatically determined by the software, based on the building form and geographic coordinates of the project. The ratio of windows to north, south, east and west walls is 40% by default. All windows have shades with a depth of 45.72 cm. Also, the type of windows in the conceptual model is double-glazed windows without any external cover. Structure of the walls used in the conceptual model is light with insulation coverage in a mild climate, and the roof structure is light and without insulation. Values of the building infiltration rate, lighting efficiency, plug load efficiency, and operating schedule are adjusted according to the BIM parameter (Table 3). The building%u2019s HVAC system is assumed to have a BIM parameter (Residential 14 SEER/0.9 AFUE Split/Packaged Gas <5.5 ton). This building has no day lighting and occupancy control system and photovoltaic solar panels. By adjusting the effective parameters on energy consumption according to Table 4 and Appendix B, the energy cost would be 5.96 USD/m2/y. Accordingly, the energy Table 3: Basic parameters of the energy model in the conceptual massesBuilding form Module-1 Module-2 Module-3Energy cost (USD/m2/y) 14 14.8 14.3Effective factor Input parameterBuilding orientation BIMWindow-to-Wall ratio (Southern walls) BIM (40%)Window shades (south) BIM (0.4572 m)Window glass (south) BIM (Double Pane Clear %u2013 No Coating)Window-to-Wall ratio (Northern walls) BIM (40%)Window shades (north) BIM (0.4572 m)Window glass (north) BIM (Double Pane Clear %u2013 No Coating)Window-to-Wall Ratio (Western walls) BIM (40%)Window shades (west) BIM (0.4572 m)Window glass (west) BIM (Double Pane Clear %u2013 No Coating)Window-to-Wall ratio (Eastern walls) BIM (40%)Window shades (East) BIM (0.4572 m)Window glass (East) BIM (Double Pane Clear %u2013 No Coating)Wall construction BIM (Lightweight Construction %u2013 Typical Mild Climate Insulation)Roof construction BIM (Lightweight Construction %u2013 No Insulation)Infiltration BIM (None)Lighting efficiency BIM (10.76 W/m2)Day lighting and occupancy controls NonePlug load efficiency BIM (10.76 W/m2)HVAC BIM (Residential 14 SEER/0.9 AFUE Split/Packaged Gas <5.5 ton)Operating schedule BIM (24 Hours)PV - panel efficiency NonePV - payback limit NonePV - surface coverage 0%Table 3: Basic parameters of the energy model in the conceptual masses