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The structure of aluminum doors and windows will undoubtedly play an important role in energy-saving effect, so to achieve good energy-saving effect, we must have the most reasonable structure.
To achieve the effect of energy conservation, we must consider from the thermodynamic point of view. Heat exchange in thermodynamics is divided into convection, conduction and radiation. Of course, these three methods also apply to the construction of architectural aluminium windows and doors and curtain walls. Convection is the flow of hot and cold air in the gap between aluminum doors and windows cycle, resulting in heat exchange, cause in heat loss.
Conduction through one side of the object itself to the heat conduction to the other relative to the surface by the molecular movement of heat transfer. Radiation is energy that is directly transmitted by infrared rays. Regardless of the window made of any material, the most effective blockade of the above three heat exchangers can be referred to as the best energy-saving window. Some people say that "plastic window is energy-saving window" is not right.
Reduce the loss of heat, energy waste, not just the problem of using plastic or aluminum, from three major aspects to consider how to reduce the heat (or air conditioning) loss, really play a saving role. First, from the window structure design considerations.
Second, the heat dissipation by the large area of the glass not the window frames, which account for 70% to 90% of the windows. Flat glass, coated glass, hollow glass, Low-E glass, Low-E hollow glass both have the energy-saving effect, just in the different degree. In different regions, the architectural requirements isn’t the same, which kind of glass can’t replace another kind of glass. Third, the window frame material energy saving.
The general used in the construction of architectural aluminium windows is sliding window, casement window and fixed window.
Sliding window is developed from the early of Japan, two sash in the window frame up and down to open and close the window area for the frame half. The size of the convection of heat and air is proportional to the size of the upper and lower voids of the sash. Due to the prolonged service time, the surface of the top of the sealed wool is worn and the convection increases along the upper and lower voids of the window, resulting in more serious energy consumption. The sliding window isn’t ideal in energy-saving whether it is made of aluminum or plastic. It can be said that the sliding window structure determines that it is not an ideal energy-saving window.
Casement window divided into opening inside casement window and opening outside casement window. The qualification modular aluminium profile, the sash and sash, sash and the frame are generally made of good rubber seal. After the sash is closed, the sealing rubber bead is pressed tightly and the sealing performance is very good, so it is difficult to form convection. The heat loss of this window type is mainly the heat conduction and radiation of the glass and window sash profile. If we can solve this problem, the energy-saving effect of the windows will be favorably guaranteed. From the structural point of view, the casement window than the sliding window has obvious advantages. Casement window can be called a real energy-saving window.
.三, The fixed window is embedded in the wall, the glass is directly placed on the window frame, and the four sides of the glass and the window frame are sealed with sealant. In the normal condition, with well water proof and air proof, the air is difficult to convection through the sealant, convection heat loss is minimal. The heat transfer of glass and window frames is a source of heat loss. Fixed window is the most energy-saving window type.