[China Aluminum Industry Network] With the improvement of China's building energy-saving awareness, the heat transfer coefficients of energy-saving windows and glass curtain walls are tentatively specified as follows:
(1) General requirements The heat transfer coefficient has a preserving period of 8 years.
(2) Advanced Apartment Buildings are Class A, K=2~2.4W/?·K
(3) Mid-range merchandise office building is Class B, K=2.6~3W/?·K
(4) General engineering regulations are Class C, K=3.1~6W/?·K
The heat transfer coefficient of similar domestic energy-saving windows and glass curtain walls in foreign countries is generally specified as K=1.8-2 W/?·K and the stability period is not less than 10 years.
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