Calculation method and consideration factors of equivalent thickness of insulating glass

The calculation of the equivalent thickness of insulating glass varies from case to case, but usually involves multiple factors.

First, if there is a vacuum between two pieces of glass, the equivalent thickness d is calculated by the formula: (d1d2)/(d1+d2), where d1 and d2 represent the thickness of a single piece of glass, respectively.

However, if there is air between the two pieces of glass, the equivalent thickness is calculated slightly differently, usually using the formula: (d1d2)/(d1+d2-0.000432d1d2), where 0.000432 is the heat transfer coefficient of the air.

In addition to the above methods, according to the national standard GB/T 11944, the equivalent thickness d is calculated by the formula: (a1 + a2 + k)/(1-k), where a1 and a2 are the actual thickness of the two glass plates of the insulating glass, and k is the width correction factor of the gap, whose value depends on the gap thickness and the actual thickness of the glass plate.

When calculating the equivalent thickness of insulating glass, it is also necessary to consider its heat transfer mode, such as heat dissipation, radiation, convection, etc., as well as the installation location, structural type and heat insulation requirements of insulating glass.

In general, the calculation of the equivalent thickness of insulating glass is a comprehensive consideration of a variety of factors.