HVAC design for a passive office building in Urumqi

Because of the strict insulation requirenent for passive building, there is the fundamental difference of thermal load calculation between conventional building and passive building. According to the unique climate in Xinjiang, relying on tunnel ventilation, heat recovery from outdoor air and direct evaporative cooling technology can meet 25 ℃ of indoor temperature in summer without mechanical cooling system, and reduce the energy consumption of air conditioning and heating system. Using condensing gas boiler as heat source can save 90% of heating costs for the owners in the premise of ensuring the heating quality.