About Low-E Glass Introduction

Excellent Thermal Properties of Low-E Glass

The heat loss of exterior door and window glass is the main part of building energy consumption, accounting for more than 50% of building energy consumption. Research data show that the heat transfer on the inner surface of glass is dominated by radiation, accounting for 58%, which means that to reduce the loss of heat energy by changing the properties of the glass, the most effective method is to suppress the radiation on the inner surface. The emissivity of ordinary float glass is as high as 0.84. When a layer of silver-based low-emissivity film is coated, the emissivity can be reduced to below 0.15. Therefore, using Low-E glass to manufacture doors and windows of buildings can greatly reduce the transfer of indoor heat energy caused by radiation to the outdoors, and achieve ideal energy-saving effects.
Another significant benefit of reduced indoor heat loss is environmental protection. In the cold season, the emission of harmful gases such as CO2 and SO2 caused by building heating is an important source of pollution. If Low-E glass is used, the fuel consumption for heating can be greatly reduced due to the reduction of heat loss, thereby reducing the emission of harmful gases.
The heat passing through the glass is bidirectional, that is, the heat can be transferred from the indoor to the outdoor, and vice versa, and it is carried out at the same time, only the problem of poor heat transfer. In winter, the indoor temperature is higher than the outdoor, so insulation is required. In summer, the indoor temperature is lower than the outdoor temperature, and the glass is required to be insulated, that is, the outdoor heat is transferred to the indoor as little as possible. Low-E glass can meet the requirements of winter and summer, both heat preservation and heat insulation, and has the effect of environmental protection and low carbon.