摘要
Abstract
Taking a residential building in Beijing as an example,the heating demand was analyzed and the impact of the rated heating capacity of air-source heat pumps(ASHP)on the indoor temperature,heating load rate and energy efficiency of ASHP was studied.Three rated heating capacity schemes are set as 1.0,1.2 and 1.4 times the building design heating load,denoted as Scheme 1,Scheme 2 and Scheme 3.Under Schemes 1,2 and 3,the durations with indoor temperature below the designed heating temperature of 18 ° C are 910 h(31.34%),564 h(19.42%)and 284 h(9.78%)of the whole heating season,respectively.The average heat-ing load rates of ASHPs during the heating season for Scheme 1,2 and 3 are 71.2%,63.6%and 56.5%corre-spondingly.Their total power consumptions are 1,346.97 kW·h,1,568.44 kW·h and 1,853.07 kW·h,with corresponding operating costs of 700.42 CNY,815.59 CNY and 963.60 CNY.The equivalent unit-area costs are 10.81 CNY/m2,12.59 CNY/m2 and 14.87 CNY/m2,all lower than the current central heat-ing charge standard of 24-30 CNY/m2.For Scheme 3,the coefficient of performance(COP)of ASHPs is rela-tively high in the early and late stages of the heating season.During the heating season,the system operates 2,170 hours(74.72%)at a COP exceeding 3.0,1,553 hours(53.48%)above COP 3.5,and 1,015 hours(34.95%)above COP 4.0.Decentralized heating based on air-source heat pumps delivers energy-saving advan-tages compared with central heating supplied by dis-trict boiler rooms.For residential communities in Bei-jing,it is recommended to configure the rated heating capacity of ASHPs at 1.4 times the building design heating load,which yields the lowest operating cost.关键词
空气源热泵/额定制热量/室内温度/供暖负荷率/能效Key words
air-source heat pump/rated heating capac-ity/indoor temperature/heating load rate/energy effi-ciency分类
建筑与水利
