长江流域居住建筑不同供暖模式下的负荷特性分析

通过分析长江流域冬季供暖特点,采用建筑环境动态负荷分析软件DeST-h对该地区典型城市重庆居住建筑在连续供暖和间歇供暖2种供暖模式下的冬季逐时热负荷进行了计算,分析了2种供暖模式下的负荷分布特性。连续供暖的热负荷总体水平较低,波动较小,且与室外空气温度呈负相关,而间歇供暖的热负荷波动较大,具体表现为开始阶段热负荷较大,而后迅速降低并稳定。据此进一步分析了该负荷特性对长江流域居住建筑的空气源热泵机组选型及运行调节的影响。分析得出:按照夏季供冷工况进行设备选型,机组名义工况下的制热量能满足连续供暖的最大热负荷需求和间歇供暖稳定阶段的热负荷需求;连续供暖条件下部分负荷率主要分布在25%~75%之间,机组的运行调节可采用定容量压缩机台数控制方式;间歇供暖条件下部分负荷率主要分布在50%~100%之间,建议采用变容量调节方式。

Load characteristics of residential buildings under different heating modes in Yangtze River Basin

By analysing the heating characteristics of the Yangtze River Basin in winter, calculates the hourly heating loads of a residential building in Chongqing under continuous and intermittent heating modes by using the building environment dynamic load analysis software DeST-h, and analyses the load distribution characteristics of the two heating modes. The continuous heating load is low, with small fluctuations, and has a negative correlation with outdoor air temperature. While the intermittent heating load fluctuates greatly, and the heating load is large at the beginning and then rapidly decreases and stabilizes. Analyses the influence of load characteristics on the selection and operation adjustment of air-source heat pump units in residential buildings in the Yangtze River Basin. The results show that the heating capacity under the nominal working condition of the unit selected according to the summer cooling conditions can meet the maximum heating load demand of continuous heating and the intermittent heating load demand in the stable stage. The partial load rates under continuous heating conditions are mainly distributed between 25% and 75%, so the operation can be adjusted by the number of fixed-capacity compressors. While the partial load rates under intermittent heating conditions are mainly distributed between 50% and 100%, it is recommended to adopt the adjustment method of variable capacity.