Which property of double-walled glazing contributes to its energy conservation capability?

The energy conservation capability of double-walled glazing is primarily attributed to the air gap between the layers. This air gap acts as an insulator by reducing heat transfer, which is crucial in maintaining comfortable indoor temperatures and reducing heating and cooling costs. When the air gap is present, it slows down the transfer of heat by conduction and convection between the two glass panes. This effectively helps to prevent heat from escaping during colder months and minimizes heat gain during warmer months, enhancing the energy efficiency of buildings.

Reflective surfaces can certainly aid in minimizing solar heat gain, but the effectiveness of the double-walled glazing primarily relies on the insulating properties provided by the air gap. The color of the glass can influence how much light and heat are absorbed or reflected, but it does not play a significant role in energy conservation like the air gap does. Similarly, while the weight of the material may indicate durability, it does not directly impact the insulation or energy efficiency of the glazing system. Thus, the air gap is the key feature that enhances the energy conservation capabilities of double-walled glazing.