相变通风屋面简化动态热网模型研究

Research on the Simplified Dynamic Heat Capacity and Thermal Resistance Model for Phase Change Roof with Ventilation

本文提出一种新型建筑围护结构——相变通风屋面,该结构通过利用相变材料的相变潜热吸收室外得热,并利用夜间通风带走相变冷凝热,降低室内空调负荷。建立了相变通风屋面简化动态热网模型,利用遗传算法对相关参数进行了辨识,并对比分析了简化模型的准确性与实用性。结果表明,简化热网模型非通风和通风工况的模拟结果中,屋面内表面温度平均值与参考模型分别相差0.04℃和0.13℃,内表面温度的相对误差平均值分别为5.8%和8.9%,内表面热流相对误差平均值分别为4.0%和6.7%,准确性高,实用性强,计算量小,可嵌入到能耗模拟软件中进行节能特性分析及气候适应性分析。

This paper puts forward a new type of building envelope structure, phase change roof with ventilation, which could reduce the indoorair conditioning load by utilizing the latent heat of the phase change material to absorb the outdoor heat gain and utilizingthe night ventilation to remove the phase change condensation heat. In this paper,a simplified dynamic heat capacity and thermal resistance model is been established. And then, using genetic algorithm to identify the model’s relevant parameters are identified by using genetic algorithm, the accuracy and practicability of which are compared and analyzed with theoretical model. The simulation results show the great accuracyand useful of the RC model. Under the non-ventilation and ventilation conditions, compared to the CFD model, the difference of the average values of the inner surface temperature are 0.04 ℃ and 0.13 ℃ respectively, while the average relative error of the inner surface temperature are 5.80% and 8.90%, the average relative error of heat flow are 4.00% and 6.65%,respectively. The calculated quantity of RC model is small, and it can be embedded into the energy consumption simulation software for energy saving characteristic analysis and climate adaptability analysis.