Summary:Generally speaking, there are three main ways of heat transfer in buildings, namely conduction, radiation and convection...
Generally speaking, there are three main ways of heat transfer in buildings, namely conduction, radiation and convection. The aluminum alloy doors, windows and curtain walls also transfer heat through these several heat transfer methods. Aluminum alloy doors and windows and curtain walls are mainly composed of aluminum alloy and glass. The heat transfer coefficient of aluminum alloy and glass is relatively high, and the heat transmission rate is also relatively large. Therefore, strengthening the control of heat transfer and reducing heat transfer by surrounding conduction, radiation and convection are the key to the energy-saving technology of aluminum alloy doors, windows and curtain walls
First of all, the energy-saving technology of the glass part. Glass is the main material of aluminum alloy doors and windows and curtain walls. It is also a good conductor of heat and a good transmittance of solar radiation. It is a key factor for us to control heat transfer. Therefore, we must pay full attention to the application of energy-saving technology to the glass part. First, use energy-saving glass as much as possible. At present, there are many types of glass used in aluminum alloy doors, windows and curtain walls, such as low-emissivity coated glass, photochromic glass, photoelectric glass, insulating glass, etc., all of which have achieved energy saving in different degrees. Therefore, it is necessary to select glass types with different performances according to the design and energy-saving performance requirements of the building.
Second, reduce the heat transfer coefficient of the glass as much as possible and improve the energy-saving and heat-preserving performance of the glass. On the one hand, Low-E glass processing technology, namely low-emissivity coated glass can be used. Low-emissivity coated glass can absorb a large amount of radiant heat energy and reduce the transfer of heat energy. In winter, the indoor heat radiation can be reflected back indoors, reducing the loss of indoor heat, and in summer, the outdoor heat radiation can be reflected out, reducing indoor heat, thereby achieving the effect of energy saving. On the other hand, hollow glass processing technology can be used. Insulating glass can be divided into two layers and multiple layers, that is, a space is formed between the glass and the glass, and filled with inert gas, dry gas, etc., to reduce heat transfer, and can play a good thermal insulation performance. Vacuum glass and aerogel glass, etc., can reduce the heat transfer coefficient of glass to a large extent and improve the energy-saving and thermal insulation performance of glass.
Third, the solar shading and energy-saving technology of glass. For glass sun shading and energy saving, it can be strengthened mainly from two aspects. On the one hand, it is to choose a reasonable material of glass to affect the radiation of sunlight. For example, Low-E glass has a relatively high transmittance to visible light in sunlight, but a low reflectance. On the basis of ensuring sufficient indoor lighting, it can also avoid light pollution caused by light reflection to a large extent. Phenomenon. On the other hand, through the construction of the sunshade system to improve the energy-saving shading. In many hot areas, setting up shading devices to reduce direct sunlight can greatly assist in the control of heat transfer. The shading system has many settings, such as outdoor shading, indoor shading and so on. A variety of shading devices can reduce the shading coefficient and improve the energy saving of aluminum alloy doors, windows and curtain walls.
Secondly, the energy-saving technology of the aluminum alloy part. In addition to glass, aluminum alloy is also the main conductor of heat conduction. The heat conducted through aluminum alloy is more than half of the heat conduction of aluminum alloy doors, windows and curtain walls. It can be seen that aluminum alloy profiles are also an important channel for heat conduction. Therefore, the application of energy-saving technologies for aluminum alloy parts is also an important part of the discussion of energy-saving technologies for aluminum alloy doors, windows and curtain walls. It is necessary to choose heat-insulating and energy-saving aluminum alloy profiles as much as possible. There are several important factors that affect the thermal conductivity of the heat-insulating aluminum alloy profile, that is, the shape design of the heat-insulating strip, the width of the heat-insulating strip, and related auxiliary measures. The heat insulation strip can form a cavity in the heat transfer path, so that the heat transfer is blocked, thereby preventing the heat transfer. It can be seen that the heat insulation strip is an important part of aluminum alloy, which plays an extremely critical role in the quality of heat insulation aluminum alloy doors and windows. Therefore, the quality, size, and internal structure of the heat-insulating strip should all be considered factors when choosing heat-insulating profiles. The use of thermal break bridge technology to improve the energy-saving performance of aluminum alloy is based on creating a continuous thermal insulation area, and the aluminum alloy is divided into two parts by the insulation strip made of polyamide nylon 66. At present, thermal insulation and broken bridge aluminum materials have been continuously used in many buildings in my country that have high requirements for thermal insulation. In the design of heat-insulating aluminum profiles, the size of the heat-insulating strips should be changed and different glasses should be assembled on the basis of keeping the cross-section of the aluminum-alloy profiles unchanged to achieve the effect of heat insulation.
Finally, through the design of aluminum alloy doors and windows and curtain walls to improve its energy saving. Aluminum alloy doors and windows are closely related to the design of curtain walls and their energy-saving effects. They are an important way to improve the energy-saving performance of aluminum alloy doors and windows and curtain walls. Therefore, it is necessary to comprehensively consider the building direction, aluminum alloy doors and windows and curtain walls as a whole to reduce the heat transfer between aluminum alloy doors and windows and curtain walls as much as possible. One is to design the orientation of aluminum alloy doors and windows and curtain walls scientifically and reasonably. The orientation of aluminum alloy doors and windows is different from that of the curtain wall, and the heat radiated by the sun is also different. When designing the orientation of aluminum alloy doors and windows and curtain walls, it is advisable to face south and try to avoid facing west. At the same time, the arrangement of the curtain wall should not be too concentrated, and should not be facing residential buildings. The second is to scientifically design the area of aluminum alloy doors and windows and curtain walls. In addition to increasing the utilization of materials as much as possible, it is also necessary to minimize the area of the curtain wall, control the ratio of aluminum alloy doors and windows to the curtain wall in the building surface area, and reduce energy consumption.