What is the essence of energy-saving system doors and windows? It’s these 4 points!
Our country is a big energy consumer. In order to reduce energy consumption, the country has carried out many energy-saving reforms. Among the total energy consumption of building envelopes, the energy consumption of building doors and windows accounts for 49% of its energy consumption.
Building doors and windows are the weakest insulating properties of buildings. 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. Doors and windows are one of the surface enclosures of buildings. , directly affects the energy-saving performance of the building. Improving the insulation performance of doors and windows is the main way to ensure the energy consumption of the building. Nowadays, the use of energy-saving doors and windows for building energy-saving has attracted more and more attention.
Because I don’t have a deep understanding of energy-saving system doors and windows, you can see this in many advertising brochures for real estate sales:
"The doors and windows of a certain building use energy-saving doors and windows of a certain brand of thermally insulated bridge-breaking aluminum profiles" or "The doors and windows of a certain building use energy-saving doors and windows of a certain brand of Low-E insulating glass."
As for energy-saving doors and windows, are they energy-saving doors and windows that only use spacer-breaking bridge profiles or only use Low-E insulating glass? What are real energy-saving doors and windows?
The so-called real energy-saving system doors and windows are not a single use of partition bridge aluminum profiles or Low-E insulating glass energy-saving materials. It is a perfect combination of a system. The comprehensive results of the performance of each link are indispensable to measure whether building doors and windows are energy-saving. Three main elements should be considered, namely heat convection, heat conduction and heat radiation:
The loss of heat is the circulation of hot and cold air through the gaps between doors and windows, which exchanges heat through gas convection, resulting in heat loss;
Thermal conduction is the heat transfer caused by the molecular movement of the material used in doors and windows. It is transferred from one surface of the material itself to another surface, resulting in heat loss;
Radiation is mainly transmitted directly in the form of rays, resulting in energy loss.
First, choose profiles of different materials. Their properties are different. The main difference is the thermal conductivity coefficient that determines the energy consumption of doors and windows. When you choose a material, the design of the profile section is very important.
The heat-insulating strips on the frame and fan material are not on the same side (either outdoors or indoors), so that after the hardware accessories are installed, the indoor and outdoor profiles are connected to each other through the metal hardware fittings bypassing the heat-insulating strips, thus allowing heat to be quickly conducted and affecting the doors and windows. energy-saving performance and so on.
We know that energy loss is mainly caused by convection, conduction, and radiation. Glass mainly loses energy due to thermal radiation, so when we choose building door and window glass, to ensure the energy saving of the overall building, we must choose glass reasonably. Take the southern region as an example. The southern region is an area with hot summers and warm winters, and the high temperature cycle is long. When choosing glass, you cannot choose transparent glass with good lighting like in severe cold areas. You should choose ones with low heat reflection, such as heat reflective coatings. Insulating glass and Low-E insulating glass, etc. In response to the needs of different buildings in various places, glass with corresponding heat transfer coefficients and shading coefficients is selected.
We once said: "Hardware accessories are the heart of doors and windows, not supporting roles." No matter how well-developed a person's limbs are and how good-looking his appearance is, if his heart is not strong, wouldn't he be a useless person? The same is true for doors and windows. Hardware accessories play a very important role in energy-saving doors and windows. They are not only closely related to the airtightness, watertightness and wind pressure resistance of doors and windows, but also play a very important role in safety and other performance.
The previous points are the requirements for several sets of components for doors and windows. Reasonable selection of components is very important, and the correct and reasonable combination of multiple components into a system is a complete energy-saving door and window. Therefore, a strong and experienced door and window assembly factory is also critical. of.
From the above analysis, we know that for truly energy-saving doors and windows, it is not enough to just use good profiles or glass and accessories. The perfect combination of good materials is the element of comprehensive evaluation of the system.