According to research, industry, transportation and buildings each account for one third of the world's energy consumption. Building energy efficiency technology should be divided into two major aspects: building envelope and building auxiliary equipment. Building envelope: thermally insulated materials, thermally insulated windows and doors. Building accessories: solar heating, solar power supply, water/ground source heat pumps, energy saving in air-conditioning systems, climate compensation in heating systems, time-sharing temperatures, and other utility energy saving measures.
The energy consumption of a building depends on four major components: walls, floors, roofs, windows and doors, and the energy consumption through windows and doors accounts for about 50%. Therefore can be used in the process can be carried out to effectively realize the energy saving and consumption reduction of energy-saving windows and doors and new types of glass, can significantly reduce the fuel consumed due to heating, cooling, so as to achieve the reduction of carbon emissions.
With the gradual development and implementation of our national economic and energy-saving technology policy system; building doors and windows energy-saving work performance labeling to promote; the introduction of energy-saving management norms in various local provinces and municipalities. The era of energy-saving doors and windows is coming.
Glass and window frames, although not directly for energy consumption, but good thermal insulation and shading performance can be greatly increased to reduce the building heating and cooling energy consumption. A building business if the window glass selection is not good, the air conditioning management system needs to do a good job can not have not achieved to improve the energy-saving design effect. The so-called energy saving is the heat insulation, heat preservation time and through the light. Glass development has a certain heat insulation, heat preservation, but different glass effect is not the same, the glass is better permeability, during the day we can not turn on the light, the use of sunlight, is also a way to achieve energy saving.
Windows and doors, as one of the four major enclosure components of building energy efficiency, 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 most important for improving the indoor heat and light environment, which directly determines the energy-saving effect of the building. 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, due to the development of aluminum alloy building materials in China belongs to the good conductor of heat, its thermal conductivity is 160W/m.K. In order to reduce the use of aluminum profiles heat transfer related coefficients, the use of PA88GF25 (PA88GF25 thermal conductivity of the material is 0.3W/m.K) as the main economic component of the heat insulation strip, aluminum alloy structural profiles are divided into two important parts with the bridge-breaking The thermal conductivity of aluminum alloy different profiles decreases obviously; at the same time, it consists of 2 independently carried out space systems to form a closed air insulation layer, fully exploiting and utilizing the heat insulation performance of the environment to make it become a material as well as the overall thermal conductivity further by reducing the heat transfer influence coefficient of the aluminum alloy metal profiles from 6.9W/m2.K, which can be reduced to 3.0W/m2.K, or even lower to 1.0W/m2 .K.
According to statistics, in the 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 solar radiation heat into the room through a single glass window and the consumption of cold air-conditioning load accounted for about 30% of the energy consumption of windows and doors to improve the quality of the indoor thermal environment is to improve the level of energy efficiency of the building is an important part of the process. Therefore, reducing solar radiation into the room and reducing the temperature difference heat transfer from windows or transparent curtain walls is a way to reduce air conditioning energy consumption.
The 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: filling inert gas. Because inert gas is heavier than air, it is not suitable for flow, and it can be used to reduce the system heat transfer correlation coefficient by 0.2W/m2K.
c. Replacement of insulating glass heat insulator: aluminum heat insulator, heat conduction is large; warm heat insulator, heat conduction is small, improve the surface temperature of the glass edge, effectively reduce the glass surface condensation; reduce the heat transfer coefficient strip, insulating glass can make the inner surface of the glass increased by 3 ~ 4 degrees, or make the insulating glass 75mm position temperature increased by 2 degrees 4 degrees.
(2) Aluminum alloy profile
Increase the heat break distance of aluminum profile: Increase the width of heat insulation strip. Choose good thermal insulation frame: Frame is another weak link of heat loss of window, frame has great influence on the performance of the whole window. Change the size of the cavity profile: Large cavities are divided into small cavities using finned insulating strips, bars, etc. in the insulating cavity.