According to research, industry, transportation and buildings each account for one-third of the world's energy consumption. Building energy-saving technology should be divided into two aspects: building envelope and building auxiliary equipment. Building outer protective structure: thermal insulation materials, thermal insulation doors and windows. Building accessories: solar heating, solar power supply, water/ground source heat pump, air conditioning system energy saving, heating system climate compensation, time-sharing temperature and other hydropower energy saving measures.

The energy consumption of buildings mainly depends on the four major components of walls, floors, roofs and doors and windows, and the energy consumption through doors and windows accounts for about 50%. Therefore, energy-saving doors and windows and new types of glass that can effectively achieve energy saving and consumption reduction can be used in the process, which can greatly reduce the fuel consumption for heating and cooling, thereby reducing carbon emissions.

With the gradual formulation and implementation of our national economic and energy-saving technology policy system; the promotion of energy-saving performance labels for building doors and windows; the introduction of energy-saving management standards in various local provinces and cities. The era of energy-saving doors and windows is coming.

Although glass and window frames do not directly consume energy, good thermal insulation and shading performance can greatly increase and reduce the energy consumption of building heating and cooling. If the window glass of a construction enterprise is not selected well, no matter how good the air conditioning management system needs to be, it cannot fail to achieve the effect of improving the energy-saving design. The so-called energy saving refers to heat insulation, heat preservation time and light passing. The development of glass has a certain effect of heat insulation and heat preservation, but different glass has different effects. The permeability of glass is good. During the day, we can turn on the lights and use sunlight, which is also a way to achieve energy saving.

Doors and windows, as one of the four major building envelope components for energy conservation, are the weak links in building thermal insulation, heat insulation and sound insulation. Building energy is lost in the form of radiation, convection, conduction and air infiltration. Therefore, windows are the top priority for improving indoor heat and light environment, which directly determines the energy-saving effect of buildings. Whether it is the energy saving of new buildings or the energy saving renovation of existing buildings, energy saving windows are of great significance!

In terms of heat transfer technology, since the development of aluminum alloy building materials in my country is a good conductor of heat, its thermal conductivity is 160W/m.K. In order to reduce the heat transfer correlation coefficient of the aluminum profile, the thermal insulation strip with PA88GF25 (the thermal conductivity of PA88GF25 material is 0.3W/m.K) is used as the main economic component, and the aluminum alloy structural profile is divided into two important parts, so that the The thermal conductivity of the different profiles of the bridge aluminum alloy decreases significantly; at the same time, it consists of 2 independent space systems to form a closed air insulation layer, which fully exploits and utilizes the thermal insulation performance of the environment, making it a material and the overall thermal conductivity is further passed. If it is reduced, the heat transfer influence coefficient of aluminum alloy metal profiles can be reduced from 6.9W/㎡.K to 3.0W/㎡.K, or even lower to 1.0W/㎡.K.

According to statistics, under heating or air conditioning conditions, the heat loss of a single glass window in winter accounts for about 50% of the heating load, and in summer, due to the solar radiation heat entering the room through a single glass window, the cooling consumption accounts for about 30% of the air conditioning load. Reducing the energy consumption of doors and windows is an important part of improving the quality of indoor thermal environment and improving the level of building energy conservation. Therefore, reducing the solar radiation entering the room and reducing the temperature difference heat transfer of windows or transparent curtain walls are ways to reduce the energy consumption of air conditioners.

Main technical measures to improve the performance of the whole window

(1) Glass

a. Changes in the structure of the glass: hollow rate, low emissivity (low E) insulating glass.

b. Change the different types of gas in the cavity: fill with inert gas. Because the inert gas is heavier than air, it is not suitable for flow, and the heat transfer correlation coefficient of the system can be reduced by 0.2W/㎡K.

c. Replace the insulating glass heat insulation sheet: aluminum heat insulation sheet, with large heat conduction; warm heat insulation sheet, small heat conduction, increase the surface temperature of the glass edge, effectively reduce the condensation on the glass surface; reduce the heat transfer coefficient, and the insulating glass can make the inside of the glass Increase the surface by 3~4 degrees, or increase the temperature of the 75mm position of the insulating glass by 2 degrees and 4 degrees.

(2) Aluminum alloy profiles

Increase the insulation distance of aluminum profiles: increase the width of the insulation strip. Choose a well-insulated frame: Frames are another weak link in window heat loss, and framing can have a big impact on overall window performance. Change the dimensions of the cavity profile: The large cavity is divided into small cavities using fins to insulate tape, rod, etc. insulation cavities.