Energy saving principle of insulating glass

Issuing time:2019-03-13 09:22

Energy saving principle of insulating glass

The heat insulation performance of insulating glass is mainly due to the fact that the internal gas is in a closed space, the gas does not generate convection, and the thermal conductivity of the air is 0.028w /m.K, which is 1/27 of the thermal conductivity of the glass is 0.77w/m.k. therefore, the heat transfer to heat transfer and conduction in the energy transfer of insulating glass accounts for a small proportion. To improve the insulating performance of insulating glass, it is necessary to increase the thickness of the space layer and replace the air inside the insulating glass with a gas with low thermal conductivity, so as to reduce the conduction and heat transfer. To reduce radiation heat transfer, it is generally through the use of sunlight control, especially low radiation glass,to control the various rays through, to achieve the purpose of reducing radiation heat transfer.

Insulation and sound insulation principle of insulating glass:

As we all know, there are three ways of energy transfer: namely, radiation transfer, convection transfer and conduction transfer.

Radiation transfer is the transfer of energy in the form of radiation in the form of rays, including visible, infrared and ultraviolet radiation, just like the transmission of the sun's rays. Reasonable configuration of insulating glass and reasonable thickness of insulating glass spacer can minimize the transmission of energy through the form of radiation, thus reducing the loss of energy.

Convection transfer is due to the temperature difference between the two sides of the glass, causing the air to fall on the cold side and rise on the hot side, generating convection of the air and causing the loss of energy. There are several reasons for this phenomenon. First, the poor sealing between the glass and the surrounding frame system leads to the direct exchange of the gas inside and outside the window frame and convection, resulting in the loss of energy. Second, the unreasonable design of the internal space structure of the insulating glass leads to the convection of the gas inside the insulating glass due to the temperature difference, which drives the exchange of energy and causes the loss of energy. Third,the temperature difference between the inside and outside of the window that forms the whole system is large, resulting in the temperature difference between the inside and outside of the insulating glass is also large. With the help of cold radiation and heat conduction, the air first produces convection on both sides of the insulating glass, and then passes through the insulating glass as a whole, resulting in the loss of energy. Reasonable design of insulating glass can reduce convection of gas and energy.

Conduction transfer is through the movement of the object molecules, driving the energy to move, and to achieve the purpose of transmission, just like cooking with an iron pot and welding things with an electric soldering iron, and the transmission of insulating glass to the energy is through the glass and its internal air to complete. We know that the thermal conductivity of the glass is 0.77w/m2k. And air coefficient of thermal conductivity is 0.028 W/m2k, thus, the thermal conductivity of glass is the air27 times, and the presence of reactive molecules such as water molecules in the air, affecting hollow glass energy conduction and convection transfer performance, the main factors and thus improve the sealing performance of hollow glass, is an important factor to improve the performance of hollow glass heat insulation.

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