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Kermit Share | System Doors and Windows Knowledge Points

Release time:

2021-11-03

China is a big energy consumption country, in order to reduce energy consumption, the country has carried out many energy-saving reforms, but in the building envelope can always, the energy consumption of building doors and windows accounts for 49% of its energy consumption.

The position of 1. energy-saving doors and windows

Building doors and windows are the weakest position of building thermal insulation performance. With the continuous improvement of people's living standards, in order to create a comfortable living environment, indoor cooling or heating methods are becoming more and more common. As one of the surface enclosures of buildings, doors and windows directly affect the energy-saving performance of buildings. Improving the thermal insulation performance of doors and windows is the main way to ensure the energy consumption of buildings, now the building energy saving using energy-saving doors and windows more and more attention.

2. door and window energy-saving system

energy-saving system door and window is not a single aluminum profile with thermal insulation broken bridge or a Low-E of insulating glass energy-saving materials. It is a perfect combination of a system. The comprehensive result of each link is indispensable. To measure whether building doors and windows are energy-saving, three elements should be mainly considered, namely heat convection, heat conduction and heat radiation:

1. The loss of heat is the circulation of hot and cold air through the gap between doors and windows, and heat exchange is caused by gas convection, resulting in heat loss.

2, heat conduction is the heat transfer by the molecular movement of the material itself used in doors and windows, which is transferred from one surface of the material itself to the other, resulting in heat loss;

3. Radiation is mainly transmitted directly in the form of rays, resulting in energy loss.

From the above three elements, we should pay attention to the following aspects for real energy-saving doors and windows:

1. profile design and selection

Different profiles have different performances, mainly because the different heat conduction coefficients determine the energy consumption of doors and windows. When you choose a material, the design of profile section is very important. The heat insulation strips on

frame and fan material are not on the same side (outdoor or indoor), so that after the hardware fittings are installed, the indoor and outdoor profiles are connected to each other through the metal hardware fittings to bypass the heat insulation strips, thus making heat conduction quickly and affecting the energy-saving performance of doors and windows, etc. The choice of

2. glass

The loss of energy is mainly caused by convection, conduction, and radiation. The glass is mainly heat radiation loss energy, so when we choose the building door and window glass, to ensure the energy saving of the whole building, we have to choose the glass reasonably. In response to the needs of different buildings, choose the corresponding heat transfer coefficient and shading coefficient of glass.

Selection of 3. Accessories

Requirements for several groups of components of doors and windows, reasonable selection of components is very important, and the correct combination of various components into a system is a perfect energy-saving doors and windows. From the above analysis, we know that the real energy-saving doors and windows should not only use good profiles, glass and accessories, but also the perfect combination of good materials, but also the elements of systematic comprehensive evaluation.

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