Because the large population, is extremely huge to the energy demand, our country already realized saves the energy importance, therefore, the country promoted some in the construction aspect to save the energy measure gradually, for example: The construction curtain wall windows and doors must use break the bridge molding, the aluminum alloy windows and doors and the curtain wall heat transfer coefficient must control in the scope, the construction window wall ratio which the standard allowed must satisfy standard request and so on.In order to realize the low energy consumption, the construction curtain wall windows and doors select in Low-E the hollow glass are a very unwise choice.
2nd, in Low-E spatial glass meaning
In Low-E hollow glass, is through covers the hollow glass in the hollow glass internal surface which metal materials and so on silver form.Because the glass surface has plated a metallic membrane, therefore has the high transmittance to the visible light, also has the high index of reflection to infrared.This glass and the ordinary hollow glass compare, have merits and so on heat preservation, heat insulation, environmental protection, sound insulation, is the present most effective energy conservation glass, therefore the modern architecture relies on extremely selects this kind of glass.
3rd, in Low-E hollow glass principle of work
The interchange of heat, the hot air is always mobile to the cold air.In winter, room internal heat air through glass to outdoor flowing; In the summer, the outdoor hot air flows through the glass to the room in.The sunlight heat energy mainly has the obvious energy of light (short wave hot) and the black light can (long wave be hot, namely infrared) two parts.Obviously the energy of light accounts for 46%, infrared accounts for 52%, and some 2% is the ultraviolet ray.
But the Low-E coating unique function, is lets the obvious energy of light penetration reflect the black light.Therefore, in the summer, it may cause the visible light (sunlight) to penetrate, simultaneously the pitch street, the building and so on the intense black light which releases can (infrared radiating heat) prevent in outside, therefore the building owner may reduce in the room greatly the air conditioning expense.In the winter, it may admit the obvious energy of light, simultaneously, can (infrared radiating heat) reflect the room in black light in the room, does not cause it outward to disappear through the glass, therefore the energy level maintains in well the room warm, reduces in the winter room greatly the payment for heating.
Today, in US and Germany, uses the Low-E glass to become one kind of energy conservation, the environmental protection new tidal current.But in our country then just started, will believe in the near future, our country also could catch up with “the new tidal current”, put on this new style coat for the building.
4th, in Low-E hollow glass manufacture craft
The Low-E glass divides into the off-line Low-E glass and the online Low-E glass two kinds according to the manufacturing craft way.Both film ingredient and the structure, the production craft, make differences and so on equipment to be very big, these two kind of membrane performance characteristic also has certain difference, specifically as follows.
The off-line Low-E glass uses the vacuum magnetism to control the sputtering coating craft generally, plates the system multi-layer compound membrane in the glass surface, realizes the Low-E function.The most main merit is the color is richly colorful, the purity, the heat studies performance surpass the online Low-E glass.Its shortcoming is the silver film is extremely frail, must have to make the hollow glass, also in has not made in front of the hollow product, also is not suitable the long-distance transport.
The online Low-E glass is transforms through the equipment, uses chemistry gas phase deposition craft and the special-purpose material in floats on the law production line the glass belt surface to form one to have the low emissivity performance function membrane.This craft production Low-E glass is called the online Low-E glass, its film material is the semiconductor oxide compound, the product color only has the green and the colorless two kinds.Online Low-E and off-line Low-E compare, have very many merits, for instance: May the steel, the curving processing, be possible the independent employment, not to need to hit the dead level to protect, not storage time limit.But its heat preservation heat insulation performance is bad, the off-line Low-E glass heat transfer coefficient value is online 2/5~3/5 time.
5th, Low-E glass in architectural engineering application
Construction glass selection decided by many kinds of factors, for example: Technical level, legal laws and regulations, building need, construction style, owner and designer's hobby, fund situation and building locus climatic conditions and geographic latitude and so on.If the energy conservation target is high, then must use the off-line Low-E glass generally to be able to satisfy the request, otherwise, may select at will.Because the off-line Low-E glass energy conservation effect is higher than the online Low-E glass approximately about 8%.
Generally constructs the construction work which the designers all very much care about oneself design to have the unique style, avoids with having the construction as far as possible either periphery the building similar or identical.Therefore mostly selects the variety to be many, the color bountiful off-line Low-E glass product.The online product more is selected in the ordinary low-grade construction.
In summary, the off-line Low-E glass energy conservation characteristic is higher than the isostructuralism the online Low-E glass approximately 8%, whole comprehensive price quite.The off-line Low-E glass has provided the more broader choice leeway for the owner and the building designer, but the online Low-E glass is suitable for the Low-E product initial stage promoted popularization.
6th, in Low-E hollow glass type
According to the use difference, in Low-E the spatial glass divides into generally: Gao Touxing Low-E glass, visor Low-E glass and double silver Low-E glass.
What is in Gao Touxing Low-E the hollow glass? As the name suggests, has the high visible light transmittance, the natural lighting effect is good, can save the illumination effectively the expense.In Gao Touxing Low-E the hollow glass also has following characteristic:①The solar energy transmissibility is extremely high, the overwhelming majority solar energy may radiate through the glass to the room in;②The remote infrared ray can actually the very good reflection, therefore has the good heat insulation performance.Its applicable scope:①The northern area winter quite is cold, therefore the effective use winter solar energy is Gao Touxing the glass most remarkable characteristic.In the winter sun heat radiation penetration glass enters enters the inner rooms in the increase room heat energy, but in the room warm air sends out the far infrared is reflected by the glass in the room, thus enable in the room to have the high temperature, has achieved the energy conservation effect;②Is suitable in has the high request building to the light.For example office building, market and so on.
What is in visor Low-E the hollow glass? Is sun's glare is covered through the Low-E membrane establishment in outdoor one kind of glass.This kind of glass has following characteristic:①Can outdoor glare mask, but the visible light can be suitable actually passing;②The solar energy transmissibility quite is moderate in, can big reduce the solar heat radiation actually to enter enters the inner rooms;③Is high to the remote infrared ray index of reflection, effective had prevented in outdoor two heat radiations enter enter the inner rooms.Applicable scope:①Also is suitable for the summer burning hot south area is also suitable for the winter cold northern area.The reason is: In north winter, this kind of in glass although can limit the part sun heat energy to enter enters the inner rooms, but can in the very good impediment room the heating equipment produce actually thermal outflow.The south summer is burning hot, in the room has established the refrigeration equipment in, this kind of glass may reduce the solar heat energy to enter enters the inner rooms, also can reduce the air conditioning air conditioning the exosmosis.Therefore, looking from the energy conservation effect, the visor is not lower than Gao Touxing, and north and south all is suitable;②The applicable scope is extremely widespread, both has the cosmetic and to have the camouflage.
What is the double silver Low-E glass? Is in the film has two silver-plating stratification planes, therefore acquires fame for the double silver.In double silver Low-E the hollow glass manufacture craft is complex, the price is soaring.But this kind of glass has Gao Touxing the Low-E glass Gao Tou merit, simultaneously also has the visor Low-E glass visor characteristic, this kind of glass other two kind of Low-E in hollow glass ingenious union, therefore, this glass for building beyond the material world windows and doors in most ideal glass.Applicable scope: The geography condition limit, the building use function limit, may not use in any building.
Above although, in double silver Low-E the hollow glass has these merits, but stemming from the construction cost consideration, in the building uses this kind of glass the scale quite to be also limited at present, only then the extremely few uses, usually say, the double silver must compared to single silver construction cost high 50 Yuan /m2~100 Yuan /m2 about.But, considered from the long-term significance that, this kind of glass can save the massive energy for later life, therefore has the necessity to select this kind highly effective very much, the energy conservation, the environmental protection glass.
7th, in Low-E hollow glass prospects for development
According to our country which 1986 formulated constructs the plan which the energy conservation divided three steps walks, the current government all levels of energy conservation control section was starting conserves energy 65% goal.The construction curtain wall, the windows and doors are construct the energy consumption consumption the most main way, only then the good this pass, our energy conservation goal only then can realize.But in Low-E hollow glass appearance, greatly sped up the energy conservation goal realization step.
Along with the people quality of life unceasing enhancement, the request future the building will be able to carry on the control through own material to the sunlight, achieved the heat insulation, will guard against the fog, from the clean goal, by will save the resources, the purification environment comfortably, the creation, the security, the functionalization space.In Low-E the hollow glass is the most ideal substitution material, the market potential infinite.
8th, concluding remark
The this article above content has carried on the preliminary introduction to the Low-E glass.Through this article introduction, hoped can will design the personnel for the curtain wall when the next choice construction glass provide some design mentality and the model function.