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An external window directly affects the energy performance of its building. In modern well-insulated buildings, U-values for walls of 0.36 W/㎡K or even lower can be realized. In such buildings, glazing with typical U-value of 2.1 W/㎡K or higher creates thermal weak spots on the facade. The performance of the existing triple glass window has been limited to energy savings and condensation prevention. In this study, the performance of condensation prevention of a vacuum multi-layer glass was analyzed. The final conclusion through mock-up experiments is as follows. The surface temperature of the vacuum multi-layer glass was 2℃ higher, and the temperature difference ratio (TDR) was 0.07 lower, than the corresponding values of the triple glass.

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