轻型木结构外墙热工计算方法及空调负荷分析

Analysis of Thermotechnical Calculation Method and Air conditioning Load for Lightweight Timber Frame Envelopes

摘要:

针对一种典型轻型木结构外墙，在综合分析几种常用简化热工计算方法基础上， 提出了一种改进计算方法，并与实测值进行了对比，说明改进后的简化方法准确性较好.然后运用能耗软件Energyplus对重庆某住宅卧室进行典型日的冷热负荷计算，对比单位面积的轻型木结构、节能50%及节能65%典型砖混结构外墙得热引起的空调负荷.结果表明：轻型木结构外墙所引起的冷热负荷最小,日平均冷热负荷约为节能65%砖混结构外墙的55%，但夏季隔热性能比节能65%砖混结构外墙差，负荷波动大,提高轻型木结构墙体在夏季的隔热性能是改善其热工性能的关键.

Abstract:

Based on the common thermotechnical calculation methods for lightweight timber frame wall，an improved method was presented with an accurate result which agreed well with the experimental data. The cooling and heating loads of a bedroom during typical days in Chongqing were calculated by building energy simulation program, EnergyPlus. Results show that the air conditioning load per unit of lightweight timber frame wall is the least in comparison with the loads of 50% and 65% energy efficient brick concrete walls. The daily average cooling and heating loads caused by lightweight timber frame wall are about 55% of the 65% energy efficient brick concrete wall. But the lightweight timber frame is of the poorer thermal insulation property and larger fluctuation of loads than brick concrete wall of 65% energy saving. Improving thermal insulation in summer is the key to optimize the thermotechnical performance for lightweight timber frame wall.