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Public construction is energy-saving design standard is understood
From;    Author:Stand originally


The wall outside 2. : K≤1.0W/m2.k

The habitual practice of heat preservation of the wall outside be not being made is absolutely short of of this new normative requirement. For example: + of mortar of 20 thick cement 240 thick perforated brick + the conventional construction of the heat preservation outside the outside notting have wall of mortar of 20 thick cement conducts heat 1.66W/m2.k of coefficient K = , even if is advanced paragraph of time is simple and easy outside practice of wall heat preservation - heat preservation mortar, also the new requirement of short of standard. Be informed via computation: In the wall body and outside 20 thick λ = 0.03W/m.K increase to squeeze model board between wall mortar, such construction makes outside of wall whole conduct heat 0.86W/m2.k<1.0W/m2.k of coefficient K = . This is called outside technology of the heat preservation outside the wall, it is the practice with a kind of accepted very good effect inside industry. His advantage is technical maturity, product life is longer, the body of the wall outside also can making is protected, reduce temperature stress greatly rise and fall, raise structural wear. But his defect is there is safe hidden trouble in high-level building, the practice of metope brick is restricted outside. Outside the practice of the heat preservation inside the wall cannot the problem that very good settlement builds hot bridge, at the same time room interior is used and transform get very big limitation, this kind of method already was used rarely on the project now so. Still a kind of practice is called intermediate heat preservation, make two walls, insulation material is placed among, effect of this kind of practice is good, it is the development climate that builds heat preservation, this kind of practice in foreign project gains ground already, because one cost is high,the development that is in our country basically is by limitation, 2 tectonic practices and active practice difference are too big, influence range is wide, gain ground temporarily hard.

Part of the window outside 3.

As a result of outside the window is abounded in the change in the building, breed of window frame material, glass, have without the metropolis such as sunshade serious effect building heats up industry performance, so, the standard does not have one knife to cut in the regulation of this part. What compare coefficient according to window wall is different, to the requirement of window body cent becomes a few different kinds. So-called window wall is compared, be not the ratio of the area of window and wall, however of window and the area that its are in wall body than. The area Yue Xiaoyue that the standard encourages a window inside the limits of daylighting of nature of the window outside assuring is good, namely window wall is better than Yue Xiaoyue. Because foregone now the best window that can accomplish: Double Bo hollow twin-circuit fills inert gase 40 thick, aluminium alloy breaks hot profile, body of this kind of window conducts heat tectonicly 1.5W/m2.k of coefficient K = , and of common odd Bo aluminium alloy window conduct heat 6.4W/m2.k of coefficient K = , it is 6 times of the wall. According to statistic, the quantity of heat that passes window prediction of a person's luck in a given year occupies the 46 % that build specific power consumption, because this controls a window,wall comparing is a significant energy-saving step. " standard " in the window that stipulates “ builds every front compulsively (include transparent act wall) wall area ratio all should not be more than 0.7” , this sets, build meeting huge influence the exterior surely, jin Mao edifice is Oriental perhaps the building of the full glass such as artistic center will naturally greatly decrease. Cold area of summerly hot winter (Shanghai) be so detailed regulation: When window wall compares ≤0.2, of the window conduct heat coefficient K≤4.7W/m2.k. In the application of actual project, double Bo window can satisfy window of model steel odd Bo or aluminium alloy requirement, but sufficient demand of dissatisfaction of window of steel aluminium odd Bo. This shows, for love or money, common aluminium alloy is odd Bo window is short of requirement, be sure to be able to face the condition that is eliminated; When the window wall comparing is in 0.2 and 0.3 between when, the K≤3.5W/m2.k of the window. Double Bo aluminium alloy is hollow (layer of 16 thick air) conduct heat 3.6W/m2.k of coefficient K = , do not satisfy a requirement likewise, if instead breaks the aluminium alloy profile of hot bridge,satisfy. When the window wall comparing is in 0.3 and 0.4 between, of the window conduct heat coefficient K≤3.0W/m2.k. Hollow glass can satisfy aluminium alloy of the bridge that break heat requirement. When the window wall comparing is in 0.4 to 0.5 between, the K≤2.8W/m2.k of the window. When the window wall comparing is in 0.5 to 0.7 between, the K≤2.5W/m2.k of the window, usually hollow the window body construction that fills plated film of inert gase glass to break hot bridge aluminium alloy can satisfy a requirement. Above is " public construction is energy-saving design standard " the requirement to the window, window body construction is the common law that summarizes at ordinary times partly, the standard did not allude, in encounter actual project to should have concrete analysis and consideration. " standard " besides to the window conduct heat coefficient made specific provision outside, the idea that still another concerns a window affects architectural to heat up industry performance: Sunshade coefficient, SC value. In a word, to the keep out degree of sun's rays. In all two kinds of forms: Type of the sunshade outside having, type of the sunshade outside notting have. Not be to mention sunshade to have to be in outdoor outside the setting sunshade fender, when the sunshade outside notting have, pass vitreous plated film, also can produce adumbral effect, normative of course advocate in Xiaredong measure of the sunshade outside cold region setting. " standard " such regulations: When the sunshade outside having, coefficient of sunshade of the adumbral outside the sunshade coefficient × of glass of sunshade coefficient = ; When the sunshade outside notting have, the sunshade coefficient of glass of sunshade coefficient = . Sunshade coefficient is smaller, prevent sunshine to enter indoor effect to had been jumped over. Outside although sunshade coefficient has very complex formula, but understand very easily. When the sunshade outside notting have, such getting of sunshade coefficient of glass: The sun's rays transmitance of the standard white glass with 3mm 0.89 for base, the sun's rays transmitance of building place use glass is divided with the sunshade coefficient that the 0.89 numbers that reach are glass. " standard " when stipulating window wall compares ≤0.2, the SC of pane does not make a demand outside, the window wall of other condition is in than requirement SC 0.4 and 0.6 between, southeast on the west to glass encourages plated film.
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