Field test of air tightness of new residential buildings in Dalian

Measures the air tightness of several new residential buildings in Dalian using differential pressure method and detects air leakage points using infrared thermal imager. Tabulates some evaluation indexes of building air tightness at home and abroad. Compares the testing results with the evaluation indexes of Germany building energy efficiency standard and some air tightness testing results from several European countries. According to relative regulations on building air tightness and ventilation modes of Germany building energy efficiency standard, discusses the necessity of adopting mechanical ventilation system and heat recovery system in the tested residential buildings.