建筑能耗分析已经成为大部分建筑设计的一个重要环节,为此各类模拟工具被开发用来计算室内热湿环境以及建筑的热负荷。准确的负荷计算应当考虑到建筑围护结构内的热湿耦合传递以及围护结构和环境间的热湿交换,然而在通常的能耗计算中围护结构的湿缓冲效应常常被忽视,这会对模拟结果造成较大误差。本文以Energy Plus为平台,对比分析了3种热湿耦合模型(传递函数模型CTF、热湿耦合传递模型HAMT、有效湿渗透深度模型EMPD)在模拟室内温湿度和预测建筑能耗方面的精确度,并评价了其在3种典型气候下的适用性。结果表明,在湿热气候下,CTF模型由于较短的运算耗时和合理的结果误差可在HAMT模型外被采用;在温和气候下,CTF模型和EMPD模型可根据不同的换气次数应用于快速模拟过程,换气次数较小时EMPD模型的模拟误差更小,而CTF模型在高换气次数下更适用;在干热气候下,建筑材料的湿缓冲效应十分有限,运算速度成为影响适用性的主导因素,此时CTF模型最为合适。
The calculation of building energy consumption is needed in most architecture design projects. Different kinds of thermal models have been developed to predict the indoor air temperature and relative humidity as well as the building's heat loads. An accurate heat load requires calculating coupled heat and moisture transfer in building envelopes and the hydrothermal interactions between the envelopes and the environment. However,the moisture effects of building envelopes are often neglected. This would bring much error to the simulation results. The present study evaluated the accuracy and applicability of three thermal models in Energy Plus,namely Conduction Transfer Function(CTF) model,Heat and Moisture Transfer(HAMT) model,and Effective Moisture Penetration Depth(EMPD) model,for calculating moisture effects on building energy consumption in different typical climates.Results indicate that CTF is acceptable due to its least computing time and reasonable inaccuracy in hot/humid climate. In temperate climate,CTF and EMPD can be applied for quick energy simulation depending on the infiltration rate. When the infiltration rate is lower,EMPD shows minor error while CTF is more appropriate for higher infiltration rate. In hot/dry climate,computing speed becomes the leading factor that affects applicability,due to limited moisture effects. In this case,CTF is the most suitable choice.