The heating is burning enough, but the house is still cold, and while the body is not comfortable, the energy is also quietly draining. There are two reasons why the home is not warm, either the wall insulation is not good, or the insulation performance of the windows is poor. Walls are hard to fix on their own, but replacing well-performing windows is much easier.
Energy efficient windows help you save money
With the increasing attention of thermal insulation wall materials and the maturity of technology, windows have become the weak link of house thermal insulation. Some data show that, for a room that is covered with thermal insulation materials, the energy loss can account for more than 50% of the building's energy consumption for thermal insulation in winter or cooling in summer because of the use of ordinary single-layer glass windows. Generally, it only accounts for 25%-30% of the external wall area of the building. This is why even though the walls are insulated with materials and the heating and air conditioning are turned on very high, the house is still cold in winter and hot in summer, and the annual air conditioning and heating bills cost a lot more.
Cold in winter and hot in summer, weak windows are the "energy consumption black hole" of the house
According to experts in building materials: Modern buildings generally tend to have large areas of lighting. If ordinary transparent glass is used, its heat transfer coefficient is high, and there is no effective restriction on solar radiation and far-infrared heat radiation. Therefore, the larger the area, the indoors in summer. The more heat there is, the more heat is lost indoors in winter. At present, the commonly used sliding-type plastic-steel windows or aluminum alloy windows have poor air tightness, and a large amount of energy is lost from the window seams, which is also the main reason for the large amount of energy consumption of the windows.
Compared with developed countries, the energy consumption of windows in buildings in my country is 2-3 times that of them. Therefore, the selection of energy-saving windows has become an inevitable trend of building energy-saving. There are three main technical measures to improve the window energy-saving index by reducing the use of glass thermal insulation air conditioners by three hours a day: partitioning the thermal bridge of the window frame; improving the airtightness of the window; increasing the number of glass layers and selecting glass varieties. The glass accounts for about 80% of the entire window area, so the selection of glass plays a crucial role in the energy-saving effect of the window.
At present, the newly built commercial buildings rarely use ordinary single-layer glass, and most of them use insulating glass. The energy saving of insulating glass is achieved by constructing the spatial structure of the glass, in which the dry convective air can block the heat conduction channel, thereby effectively reducing the heat transfer coefficient to achieve the purpose of energy saving. Double or triple glass, hollow inflatable glass, hollow coated glass, low-emissivity glass, etc., not only ensure normal indoor lighting, but also play a good role in sound insulation, heat insulation, heat preservation, and reduction of ultraviolet radiation. Scientific experiments have shown that in the high temperature of 38 degrees Celsius in summer, if the room temperature is maintained at 25 degrees Celsius for 10 hours in the same house, the air conditioner needs to be turned on for 9 hours under normal window conditions, while the energy-saving windows only need to be opened for 6 to 7 hours, which is very energy-saving. Significantly.
Choose energy efficient windows based on climate and orientation
In view of the large energy consumption of glass, it is necessary to correctly select the type of glass. Different glass has different properties, and one glass is often not suitable for all climatic areas and building orientations, so it should be selected reasonably according to the specific situation.
In the northern cold regions, the winter time is long, and the energy consumption is mainly due to the indoor and outdoor temperature difference energy consumption. Solar radiation in winter is beneficial to maintain indoor temperature, so when choosing glass, glass with low refractive index and small shading coefficient that cannot effectively utilize solar heating is not suitable for use, such as single-piece heat-reflecting glass. Transparent insulating glass has good thermal insulation performance and is more suitable. For other forms of insulating glass, the outer sheet should be transparent glass or low-emissivity (Low-E) glass, and the inner sheet should be heat-absorbing glass and heat-reflecting glass, so that the outer glass can transmit and absorb solar energy, while the inner glass and The air layer can block the indoor heat from radiating and spreading to the outside, which is conducive to indoor heat preservation in winter.
Four types of windows performance competition
Wooden windows naturally win
On the market, there are mainly two types of new wooden windows: pure wooden windows and "aluminum-clad wood" wooden windows. The biggest advantage of wooden windows is that the wood grain texture is strong. The unique warm feeling and excellent durability of natural wood have become the reasons why people love it. Usually, it can be used as an inner window, and it can also be used as an outer window after painting. In addition, aluminum-clad wood doors and windows add an aluminum alloy protective layer to the outer layer of pure wood doors and windows, which can not only meet the different requirements of sealing door and window materials inside and outside the building, but retain the characteristics and functions of pure wood doors and windows, and the outer layer of aluminum alloy also plays a role in protection. It is easy to maintain and can be sprayed in various colors on the outer layer to maintain the overall beauty of the building.
Aluminum alloy windows have many colors for thermal insulation
Aluminum alloy is a kind of mid-range profile, which is not easy to be deformed, and the price is moderate, which is easy to be accepted by everyone. With the continuous improvement of the production process of aluminum alloy windows, the technical content of aluminum alloy windows sold in the market has also been greatly improved, and the thermal insulation ability of aluminum alloy doors and windows with "broken bridge" technology has been greatly improved. In terms of appearance and style, aluminum alloy doors and windows have also broken the form of dominance of natural colors, and launched colorful aluminum alloy windows.
Long life of glass fiber reinforced plastic windows
FRP, scientific name is glass fiber reinforced plastic, foreign name: FRP. The main features of FRP are: light weight, high strength, anti-corrosion, heat preservation, insulation, sound insulation, long life and so on.
Plastic steel windows keep warm and dustproof
The outer layer of the plastic-steel window is mainly made of high-strength anti-oxidation plastic material, and the interior is supplemented by steel for support. Since the aluminum-plastic material does not conduct heat, and the joints of the good sealing equipment are tight, the plastic-steel window has the characteristics of good sealing and heat insulation, no overall deformation, and the surface is not easy to age. There is a lot of sand in the north, and many families are closing their balconies. Especially in the case of improving the utilization rate of the balcony, ensuring the temperature and cleanliness of the balcony, plastic steel windows have become the first choice.