Research on winter indoor environment of a passive office building in severe cold zone

 In this paper, the winter indoor thermal and humidity environment and air quality of a passive house at Sino-German ecological technology town in Harbin, a representative city in the severe cold zone, are tested. The results show that the average indoor temperature on each floor is 23.0 ℃, which meets the requirements of the standard. The average relative humidity is 21.3%, which is lower than the lower limit of standard. The concentrations of three indoor pollutants (PM2.5, CO2 and formaldehyde) can meet the provisions of relevant standards during most of time. The combination of G4 medium efficiency filter and H11 sub-high efficiency filter can meet the requirements of outdoor air filtration in haze days, and when the outer door is opened at some times, the indoor PM2.5 concentration exceeds the standard. It is recommended to close the outer door at any time. The vertical temperature distribution in the personnel activity area of each floor room is more uniform, and the maximum vertical temperature difference between head and ankle is 0.2 ℃, which satisfies thermal comfort standard. The indoor temperature on the first floor is higher due to the high setting temperature of the heating film, so it is recommended to cool appropriately. The indoor temperature in south-facing rooms is higher than that in north-facing rooms, so it is recommended to decrease the setting temperature for heating in south-facing rooms during the time of strong solar radiation, so as to create an energy saving, comfortable and healthy indoor environment.