有效湿渗透深度模型EMPD对建筑热湿耦合模拟的适用性研究

Analysis about applicability of effective moisture penetration(EMPD)model to simulate hygrothermal transfer in buildings

介绍了能耗模拟软件中使用最多的3种热湿耦合模型:有效湿渗透深度模型EMPD、热湿耦合传递模型HAMT以及有效湿容模型EC,分析了3种模型的公式基础及优劣。以南京地区办公室为例,使用能耗软件EnergyPlus作为计算平台,详细分析了EMPD模型对室内温湿度和全年能耗预测的准确度,比较了其与EC和HAMT的误差并分析了原因。研究结果表明,3种模型中EMPD在计算湿方面更接近作为参照标准的HAMT模型,尤其是在模拟夏季高温高湿情况下,误差小于5%,在计算能耗方面同样比EC模型更接近HAMT,误差小于8%,并且计算用时只有HAMT模型的几十至几百分之一,因此在需要兼顾计算精度和速度的情况下,可以选用EMPD模型进行建筑模拟。针对现有EMPD公式基础提出修改建议,以进一步提高计算精度。

Three most commonly used model are introduced:effective moisture penetration depth(EMPD)model;effective capacitance(EC)model and combined heat and moisture transfer(HAMT)model.The formulation foundation as well as strength and weakness of these three model are analyzed.Taking a small office building in Nanjing for example,the accuracy of EMPD is examined while predicting the indoor hygrothermal environment and yearly energy consumption based on the EnergyPlus platform.Reasons that account for the errors comparing with EC and HAMT are presented.Results show that among three models EMPD shows more similarities to HAMT than EC in terms of moisture and energy prediction with errors less than 5% and 8% respectively.Besides,EMPD runs several orders of magnitude more quickly than HAMT.So EMPD can be chosen to simulate buildings when taking both accuracy and speed into consideration.Some suggestions are proposed to further modify EMPD for a better accuracy.