Impact Analysis of Window-Wall Ratio on Heating and Cooling Energy Consumption of Residential Buildings in Hot Summer and Cold Winter Zone in China

Table 1

Components and thermal performance of the building envelope.

Building envelope	Building envelope components	Heat transfer coefficients (W/(m^2·K))
External walls	20 mm lime mortar + 150 mm porous concrete + 20 mm lime mortar	0.987
Roof	20 mm lime mortar + 200 mm porous concrete + 130 mm reinforced concrete + 15 mm lime mortar	0.812