理想被动式相变蓄能建筑蓄能调温特性研究

RESEARCH ON THERMAL PERFORMANCE CHARACTERISTICS OF IDEAL PASSIVE BUILDING WITH PHASE CHANGE MATERIAL FOR THERMAL STORAGE

为研究具有非线性热容特点的被动式相变蓄能建筑的蓄能调温特性,建立理想被动式蓄能建筑的热性能简化数学模型,提出自然室温分布频率、最高频率自然室温、设定自然室温保证率、相变材料利用率等反映被动式相变蓄能建筑热特性的评价指标,可比较得出被动式相变蓄能建筑与常物性蓄能建筑的热性能差异。与被动式常物性蓄能建筑相比,相变蓄能建筑可显著提高相变温度附近的自然室温保证率。常物性蓄能建筑的最高频率自然室温出现在平均室温附近,而相变蓄能建筑的最高频率自然室温出现在相变温度附近。

The large thermal storage capacity of the passive building envelope can decrease room temperature fluctuation and improve human comfort of indoor environment. The mathematical model of thermal performance of a idea passive building with nonlinear thermal capacity building material for thermal storage was put forward in this paper. By such model, the thermal performance of the ideal passive building with phase change material （PCM） which appears nonlinear thermal capacity was further analyzed. The difference of the thermal performance of the ideal passive building with or without PCM was compared. Also some evaluation indexes, such as indoor temperature frequency distribution, the indoor temperature on most occurrence frequency, the guarantee ratio for the setting indoor temperature and the utilization ratio of PCM, were put forward to reflect the thermal performance feature of the passive building with PCM. Research results show that compared with passive building with PCM, the passive building with PCM presents different indoor temperature frequency distribution. The indoor temperature on the most occurrence frequency of the passive building without PCM appears closely the average temperature in the heating period. However, the indoor temperature on the most occurrence frequency of the passive building with PCM appears closely the phase change temperature. Also the guarantee ratio for the indoor temperature close to the phase change temperature can be significantly increased for the passive building with phase change material.