The building is in winter the quantity of heat from window be lost is very big. According to American statistic, 30% what the building takes building disappear energy consumption about through the energy of window be lost. The proportion that holds in Sweden is larger, about 70% . Data of our country statistic makes clear occupy about 50% . Domestic and international practice proves, improve the heat preservation performance of building palisade structure, the heat preservation performance that improves a window especially is prevent be lost of building quantity of heat most the economy, most effective method. Hollow glass reached crucial action since the application that goes up in the building. Cover according to American data, high-level office building uses silver-colored grey lubricious hollow glazing every square foot annual heating specific power consumption is 5494KJ, more energy-saving than using monolayer glazing make an appointment with 2/3 (monolayer glazing every square foot annual heating specific power consumption is 17775KJ) .
As the development of economy of our country countryman, the country lives to environmental protection, energy-saving, improvement the issue demand such as the condition is higher and higher, corresponding ground drafted code of a batch of technologies. 1995 castigatory " civil building is energy-saving design standard " < JGJ26095 > (new standard of the following abbreviation) specific power consumption of requirement building heating is reduced than the standard of 80 time 50% (among them the building is assumed 30% , heating system is assumed 20% ) , surround enlarge construction material and door window to the building conduct heat coefficient raised new requirement. Of monolayer glazing conduct heat coefficient is model of steel of double Bo of 6W/m2.K odd casing of compound window conduct heat coefficient is 3.5W/m2.K, of plastic window of odd casing double Bo conduct heat coefficient is 2.6
W/m2.K. Of the window conduct heat coefficient should achieve 2.5 W/m2.K to must use hollow glass below.
According to new standard, and other places of Beijing, Tianjin, Shenyang, Dalian uses double Bo to be able to satisfy a requirement. But double Bo produces a knot easily to show an issue, become especially when double Bo is sealed and lax, the surface inside hollow layer glass allows easy knot mist and affect performance characteristics. Accordingly, using hollow glass to replace double Bo window is necessary evolution trend.
Although our country new standard is right of the window conduct heat the requirement of coefficient had than original standard very big rise, but the foreign minister that be the same as a country's more certain than still having difference.
The main problem that at present our country bldg. uses hollow glass is to build cost to increase. The addition that builds cost is OK very fast from energy-saving in call in. The fabric that program branch place makes uses the technical economy computation of hollow glass to make clear as a result, be in our country cold region (northeast, inside unconscious) the energy-saving effect that uses hollow glass to obtain, in 4-5 addition construction cost can be compensated inside year.
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