| Civil Engineering, Transportation Engineering |
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| Internal and external wall insulation effect on building energy efficiency with compartmental and intermittent energy consuming method |
| RUAN Fang, QIAN Xiao qian, ZHU Yao tai, WU Min li |
| College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China |
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Abstract A two dimensional heat transfer model of one household flat was built for a transient study of the internal and external wall insulation effect on building energy efficiency based on the intermittent and compartmental energy consuming method of residential buildings in hot summer and cold winter zone in order to explore the most suitable insulation method for resident building envelop in this climate region. The energy consumption of interior walls accounts for nearly 45% of the total amount with the mode of compartmental energy consuming. Insulation for interior walls should be considered as well as for exterior walls. With the intermittent energy consuming mode, exterior wall external insulation can decrease air conditioner heating load. When cooling in summer nights, the temperature of wall is higher than both indoor and outdoor. External insulation hinders heat in walls from dissipating to outside, and there is an “anti insulation” effect existing here. Internal insulation can effectively decrease both heating and cooling loads of air conditioner．
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Published: 31 March 2016
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分室间歇用能对墙体内外保温节能效果的影响
为了探究适宜夏热冬冷地区的围护结构保温形式,针对该地区居住建筑间歇式和分室用能特点,以户（室）为研究单元建立二维传热模型,逐秒动态分析居住建筑的能量耗散方式和墙体内外保温方式的节能效果.在分室用能特点下,两面内墙总耗能份额占总能耗的45%左右,该地区建筑节能必须兼顾外墙保温和内墙保温.在间歇式用能特点下,采用外墙外保温方式可以降低空调热负荷,但在夏季夜间制冷时,墙体温度既高于室内温度又高于环境温度,外保温阻碍了墙体向外界散热,存在“反节能”现象；采用内保温方式可以降低空调热负荷和冷负荷.
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