Gas content calculator

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Gas content - Start value

100%

Gas loss rate per year

Gas content - Start value

75%

Gas loss rate per year

Gas content - Start value

50%

Gas loss rate per year

Calculation of heat transfer coefficient of insulating glass (U_g-Value) according to EN 673:2008.
Standard values from EN 673:2008 Chapter 8 are used, if not stated otherwise.
All calculations are done for a double pane insulating glass unit with 4 mm glass thickness (both glasses) and a low-e coating on one glass with a corrected emissivity of ε = 0.03.
Gas loss rate is assumed as a constant percentage decrease rate per year, which leads to an exponential decrease curve:
gas content of year x = initial gas content • (1 - gas loss rate) ^{x years}
Cost calculation assumes a heating period of ½ year and 0.06 €/kWh for gas.