This paper introduces the basic concepts of insulating glass unit U values(heat transfer coefficient)and in GB/T22476 standard the basic conditions&mathods for calcuting glass unit U values.

介绍了中空玻璃U值（传热系数）的基本概念和GB/T22476标准对中空玻璃U值的计算和测定所规定的基本条件及方法。

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