基于热平衡法生成同时发生设计日的方法研究

Research on Method of Generating Coincident Design Day Based on Heat Balance Method

提出了基于热平衡法生成同时发生设计日的方法.首先基于热平衡法计算某城市的历年逐时动态冷负荷,以历年平均不保证50 h为依据确定理论设计负荷,采用综合聚类法挑选同时发生设计日.用热平衡法计算同时发生设计日、传统设计日的峰值负荷,确定为同时发生设计负荷和传统设计负荷.分别对比了哈尔滨、北京、长沙和广州样本房间的同时发生设计负荷、传统设计负荷与理论设计负荷的差异率.结果显示,各城市同时发生设计负荷与理论设计负荷的差异率偏差范围都远小于传统设计负荷与理论设计负荷的差异率.说明依据同时发生设计日的气象参数进行空调系统设计负荷计算是更加合理、准确的,基于热平衡法可以准确生成适合工程应用的同时发生设计日.

A method for generating coincident design days by the heat balance method(HBM)was proposed.The hourly dynamic cooling load of a city over the years was calculated,the theoretical design load was determined based on no guarantee of 50 hours for an average year,and the coincident design day was selected by the comprehensive clustering method.The peak loads of the coincident design day and the traditional design day were calculated by the HBM and identified as the coincident design load and the traditional design load.The difference rates among the coincident design load,traditional design load,and theoretical design load of the sample rooms in Harbin,Beijing,Changsha,and Guangzhou were compared,respectively.The result shows that the deviation range of the difference rate between the coincident design load and the theoretical design load in each city is much smaller than the deviation range of the difference rate between the traditional design load and the theoretical design load.It indicates that it is more reasonable and accurate to calculate the design load of the air conditioning system based on the meteorological parameters of the coincident design day,and the coincident design day suitable for engineering application can be accurately generated by the HBM.