本文選題：加氣混凝土砌塊 + 熱橋��； 參考：《武漢理工大學(xué)》2015年碩士論文

【摘要】：夏熱冬冷地區(qū),常見的保溫類型有外保溫、內(nèi)保溫和自保溫三種。熱橋形式多種多樣,且熱橋的存在,增加了通過圍護(hù)結(jié)構(gòu)的傳熱量。而準(zhǔn)確計(jì)算通過熱橋部位的傳熱量,是定量評價(jià)建筑能耗水平的基礎(chǔ)。夏熱冬冷地區(qū)對熱橋的研究多局限于一維傳熱法,即用面積加權(quán)法考慮熱橋的影響。但隨著節(jié)能工作的推進(jìn),越來越多的高性能高溫隔熱材料得到應(yīng)用,熱橋的二維、三維影響愈加凸顯。因此,應(yīng)該重視熱橋傳熱的研究。熱橋種類繁多而且與各地氣候條件密切相關(guān)。本文結(jié)合武漢地區(qū)冬季的氣候條件,選取有代表性的外墻熱橋類型(中柱熱橋、梁熱橋)進(jìn)行研究,并分為3種保溫形式:外保溫、自保溫和自保溫。將墻體總熱流量、熱橋附加熱流量、熱橋附加熱流量占總熱流量的比例、熱橋影響區(qū)域、熱橋影響區(qū)域內(nèi)熱損程度這幾個(gè)關(guān)鍵指標(biāo)作為衡量熱橋傳熱的標(biāo)準(zhǔn)。用ANSYS分析不同模型的傳熱情況。根據(jù)溫度場、熱流密度場的特點(diǎn),得出熱橋影響區(qū)域,對熱流密度進(jìn)行積分求得熱橋附加熱流量和熱橋影響區(qū)域內(nèi)的熱損程度。本文進(jìn)行了兩方面的比較:一是定量地比較了同種熱橋在外保溫、內(nèi)保溫和自保溫三種形式下傳熱的區(qū)別。結(jié)果表明:對于中柱熱橋,外保溫的效果最好,使用了高性能B05加氣混凝土砌塊的自保溫次之,內(nèi)保溫最差,但熱橋影響區(qū)域最小。而對于梁熱橋,采用外保溫可以有效阻斷熱橋的產(chǎn)生。二是同種熱橋形式同種保溫形式下參數(shù)變化對傳熱橋熱的影響,選取了不同保溫層厚度、不同保溫材料、不同柱寬、柱高(或梁高)以及不同砌塊類型進(jìn)行模擬分析。結(jié)果表明:對熱橋傳熱影響最大的是保溫層的厚度改變以及保溫材料的使用。其中,外保溫體系對減小熱橋影響作用顯著。內(nèi)保溫體系存在的主要問題是由于保溫的不連續(xù),熱橋附加熱流量過大,這一缺陷可以通過保溫層向內(nèi)側(cè)延伸得到改善。自保溫體系存在的問題是由于熱橋影響區(qū)域內(nèi)熱損程度過大,如果對保溫層兩邊進(jìn)行延伸200mm,即可有效阻斷熱橋。通過以上研究對節(jié)能設(shè)計(jì)提供理論基礎(chǔ),根據(jù)熱橋影響區(qū)域的大小以及熱損程度對構(gòu)造加以改進(jìn)。
[Abstract]:In hot summer and cold winter area, the common types of heat preservation are external insulation, internal insulation and self-insulation.The thermal bridge has a variety of forms and the existence of the thermal bridge increases the heat transfer through the enclosure structure.The accurate calculation of heat transfer through the heat bridge is the basis for quantitative evaluation of building energy consumption.The study of thermal bridge in hot summer and cold winter area is limited to one dimensional heat transfer method, that is, the area weighting method is used to consider the influence of thermal bridge.However, with the development of energy conservation, more and more high performance high temperature insulation materials have been applied, and the effects of two and three dimensional heat bridges have become more and more prominent.Therefore, attention should be paid to the study of heat transfer over heat bridges.There are many kinds of hot bridges and they are closely related to local climatic conditions.According to the climatic conditions in winter in Wuhan area, this paper selects representative types of thermal bridges for exterior wall (medium column hot bridge, beam heat bridge), and divides them into three types of thermal insulation: external insulation, self-preservation and self-insulation.The total heat flux of the wall, the additional heat flux of the heat bridge, the proportion of the additional heat flux of the heat bridge to the total heat flux, the influence area of the heat bridge and the heat loss degree of the heat bridge are taken as the criteria to measure the heat transfer of the heat bridge.The heat transfer of different models was analyzed by ANSYS.According to the characteristics of the temperature field and the heat flux field, the influence area of the heat bridge is obtained. The additional heat flux of the heat bridge and the heat loss degree in the area affected by the heat bridge are obtained by integrating the heat flux.In this paper, two comparisons are made: first, the difference of heat transfer between the same heat bridge external heat preservation, internal heat preservation and self heat preservation is quantitatively compared.The results show that the effect of external thermal insulation is the best for the middle column hot bridge. The self-insulation of the high performance B05 aerated concrete block is the second, the internal insulation is the worst, but the influence area of the thermal bridge is the least.For the beam heat bridge, the use of external heat preservation can effectively block the generation of the thermal bridge.The second is the influence of the change of parameters on the heat transfer bridge under the same heat bridge form. Different insulation layer thickness, different insulation material, different column width, column height (or beam height) and different block types are selected to simulate the heat transfer bridge heat transfer.The results show that the thickness change of insulation layer and the use of thermal insulation material have the greatest influence on the heat transfer of the heat bridge.Among them, the external thermal insulation system has a significant effect on reducing the thermal bridge.The main problem of the internal thermal insulation system is that the heat flux of the heat bridge is too large because of the discontinuity of the heat preservation. This defect can be improved by extending the insulation layer to the inner side.The problem of the self-insulation system is that the heat loss degree in the area affected by the heat bridge is too large. If the thermal insulation layer is extended to both sides 200mm, the thermal bridge can be effectively blocked.The above research provides the theoretical basis for energy saving design and improves the structure according to the size of the heat bridge affected area and the heat loss degree.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU111.41

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本文編號：1774012