Simulation of heating energy consumption of a passive house in severe cold zone

A passive ultra-low energy consumption residential building (hereinafter referred to as passive house) in Harbin, a representative city in severe cold zone, is the first passive house residential demonstration project cooperated by China and Germany. This passive house do not achieve the energy-saving effect of the design conditions in actual operation. To explore the influence of indoor temperature and window opening on the building energy consumption and indoor thermal comfort of this passive house, this paper uses a method combining scenario analysis and energy consumption simulation to obtain indoor temperature and energy consumption results under different working conditions. The results show that under the design conditions, the heating energy consumption of this passive house is 27.6 kW·h/(m2·a), which meets the energy efficiency index of ultra-low energy consumption buildings. Compared with the design conditions, if the indoor heating temperature is 19 ℃, the energy consumption is reduced by 4.7%, and if the indoor heating temperature is 22 ℃, the energy consumption is increased by 11.6%. Compared with the design conditions, in the initial, middle and final of the heating period, resident opening windows leads to an average temperature drop of 0.3 ℃, 1.1 ℃ and 0.5 ℃,respectively. Under the three window-opening behavior patterns of residents, the heating energy consumption of this passive house is increased by 37.7%, 15.6% and 10.5%,respectively,compared with the design conditions.