Two factor of Energy saving window : style of window opening and glass
Door window industry with the rapid development of economy and the forward development. With the new materials appeared unceasingly, door window industry will to high-grade, new, multi-function, many variety, a variety of real development and energy-saving. Door window should seize the history of the enterprise an important opportunity, develop truly energy saving the doors and Windows.
A correct understanding of “energy saving window“
Energy saving the window is the development direction of our industry, how to understand the energy saving window, how loud is energy saving, must from thermodynamics of heat transfer three factors: namely thermodynamics heat leakage (heat exchange) and heat conduction and radiation of the convection, to know. Convection is in door window between hot cold air gap circulating, cause gas cause convection drive the heat exchange, hot cold air convection heat generation the cycle of the loss. Heat transfer is by material itself the molecular motion of heat transfer, heat conduction through the object itself a surface transfer to another relative to the surface. Radiation heat transfer is energy to ray namely infrared directly transfer. No matter use what material made of window, such as the above three heat to the most effective blocking and control, to the energy saving of called the best window.
Energy saving of the two key elements window analysis
In order to better achieve three heat blocking, achieve the real energy saving window, from the following several aspects:
Window type is the first requirement of energy saving window
Push-pull window not energy-saving window, make the same score a window, fixed window is energy-saving Windows. From the structure of the first window design consideration, the structure of the window to energy saving plays a main role. Such as push-pull window in the window frame down rail sliding back and forth, a larger space, the space between is pulley, casement form apparent convection and exchange, hot cold air convection form a larger heat loss, the size of the convection, the size of the heat loss and casement is proportional to the fluctuation space. Right now with what heat insulation profiles for window frame can not reach all energy saving effect, can say whether aluminum alloy or tech do push-pull window are not qualified to called energy saving window.
Casement Windows, casement window frame and between the normal all use good rubber seal layering, casement closed in after sealing rubber layering pressure very tight, almost no gap, it is difficult to form convection. This window type heat loss is mainly glass, casement and window frame profiles, heat conduction and radiation heat, the heat convection heat loss than less, if can be a solution to the glass and window frame profiles of the thermal conductivity, make the same score a window than the energy saving effect of push-pull window energy saving effects have obvious advantage, make the same score a window can be called “energy saving window”.
Fixed window, window frame is embedded in wall body inside, glass installed directly in the window frame, glass and window frame has now with sealed plastic instead of glue sealing contact with the quads are sealed, such as sealant sealed tight, the air is hard to through the sealant form convection, it is difficult to cause the heat loss. Fixed window glass and window frame heat conduction as the main source of heat loss, on the glass take effective measures, can greatly improve the energy saving effect. From the structure of speaking, fixed window is the most efficient window type. In order to ventilation in the window open outfit ventilation fixed on small turned down turn window, or in a fixed on one side of the window to install a small casement Windows, special use as timing let in fresh air.
Now there are a flat on suspension, all kinds of fluctuation sliding Windows, and various types, such as in the open window open type, but are in the push-pull, flat on or fixed three window type change within it.
The second factor is energy saving glass window
In addition to the structure of the window outside, the biggest heat conduction and radiation window area is a glass. Glass is mainly rely on heat conduction and radiation heat, heat conduction is from the glass of the glass functional molecules move through the heat conduction to glass surface outside the window. The size of the heat conduction and conduction speed, the thickness of the glass, the thermal conductivity of the different glass, and at the same time, and the different nature of the glass performance related, radiation, and different nature of the glass relevant.
1. The glass of hot reflex plated film
Have a good control of the optical performance, the wavelength by 0.3 2.5 mm sunshine have good reflection and absorption ability, can significantly reduce the sun to the transfer of radiant energy, indoor, maintain a stable indoor temperature, can save the energy.
Be in usually, heat reflecting coated glass already can meet the needs of the general energy saving window, such as higher requirements, and hollow glass and hot reflex plated film hollow glass and low radiation coated glass, etc, but all have its characteristics and different USES.
2. The hollow glass
Hollow glass not only has good daylighting function, at the same time a heat insulation, sound insulation, the ShuangLou, and other special advantages. Hollow glass window with excellent insulating performance, under certain conditions the heat insulation performance can be better than the usual concrete wall. Hollow glass insulation ability mainly come from the second floor of the seal of the air layer between the glass. This air thermal conductivity coefficient is 0.028 W/MK, and the thermal conductivity of glass is 0.77 W/MK, seal the hollow glass of glass with sealant except four thermal conductivity, the rest of the large area glass have to rely on the air layer heat conduction, and increase the thermal resistance. Therefore, can obviously improve the hollow glass insulation effects.
3. Low radiation coated glass
Low radiation coated glass and say (Low-E translation says LouYi glass). According to production method, can be divided into “online Low-E glass” and “offline Low-E glass”. Online Low-E glass, namely in the float glass production line, the general tin gas directly spray into the molten metal surface, with glass cooling and become part of the metal layers of glass, its characteristics, and can be directly in the air using, can be tempered, hot bending, can long-term preservation, its defect is thermal properties relatively poor. Better than “offline” sputtering method of the production of Low-E glass “u” poor value nearly half, the windowpane adiabatic performance generally with the “u” values to said, “u” value and glass of radiation rate is directly related to “u” value is lower, through the glass of transmission of quantity of heat is lower, the window of the heat transfer performance is better.
Another method, sputtering method production Low-E glass (also called offline Low-E glass), production method is the metallic silver directly in sputtering method in plating glass surface, its disadvantages is silver membrane layer is very flimsy, and gives birth to silver oxide layer into, so that it may not like ordinary glass use, must make hollow glass, hollow glass can’t make it before the long-term preservation and transportation.
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