Guo J, Liu M S
Bibliographic info:
Proceedings of the CLIMA 2000 World Congress on Heating, Ventilating and Air-Conditioning, Copenhagen, 25-30 August 1985. Edited by P Fanger. Vol 2 Building Design and Performance. p79-84. 2 figs, 3 tabs, 1 ref

The interaction of air leakage and transmission heat through a double frame window makes the overall heat loss less than the sum of them acting separately. Theoretical calculation shows that in the case of infiltration, a double frame window may recover 21% to 32% of air leakage heat loss, and exfiltrated air through a double frame window not only loses no energy but, on the contrary, reduces the energy consumption of heat transmission, covering 23% to 36% of the enthalpy drop of exfiltrated air before and after leakage. Experimental data and field test agreed well with these results.