Effect of Argon Filling Ratio on Heat Transfer Coefficient of Double-Glazing

In this work the effect of argon filling ratio and air space thickness on the heat transfer coefficient of double-glazing was studied. The heat transfer coefficient of double-glazing was measured by heat flow meter method (based on standards ISO10291, ISO 10292, ISO8301 and DIN EN 12939), during this process the testings of argon filling ratio and emissivity of coated glass surface were involved. For the thermal performance of double-glazing, the influence of various factors on heat transfer coefficient was analyzed. The comparison was conducted between coated double-glazing (one glass pane coated with low-emissivity) and non-coated double-glazing. Within the thickness of air space in the range of 9–18 mm, the higher the air space thickness, the higher the filling ratio of argon gas, the better the thermal insulation performance achieved. Under the same gas filling ratio, the heat transfer coefficient of coated double-glazing (emissivity is 0.13) which is much lower than that of non-coated double-glazing, can effectively meet the requirement of building energy efficiency in China.