Q: How Much Energy Can Vacuum Glass Save?

A: The energy-saving performance of vacuum glass depends on the specific project and glazing configuration. Key factors include:

Local climate and heating or cooling demand;

Building design, including window-to-wall ratio, orientation and solar shading;

Window frame material, such as aluminium, thermally broken aluminium or uPVC;

Vacuum glass configuration, including glass thickness and the use of Low-E coatings.

Compared with conventional insulating glass, vacuum glass can significantly reduce heat transfer through the glazing area when appropriately configured. Under suitable conditions, heat transfer through the window area can be reduced by more than 50%.

The actual energy savings of a building should be evaluated based on the complete window system and overall building energy model rather than the glass alone. In long-term operation, reduced heating and cooling demand may help offset the initial cost difference between vacuum glass and conventional glazing.