重庆地区太阳能复合空气能热水系统关键因素分析

ANALYSIS OF KEY FACTORS AT AIR-SOURCE HEAT PUMP ASSISTED SOLAR HOT WATER SYSTEM IN CHONGQING AREA

建立太阳能复合空气能热水系统运行计算模型,基于重庆地区实测气象数据,对系统运行效果和系统影响关键因素进行分析。研究表明:重庆地区太阳能复合空气能热水系统在该文中系统条件下热泵年平均制热性能系数为3.59;设计供热水温度和设计太阳能保证率是影响系统运行和系统经济性的两个关键因素;重庆地区太阳能供生活热水设计温度宜取50℃,随着热水温度取值的增大,热泵性能和系统经济性均降低,相比于60℃,供热水温度设置为50℃时热泵性能系数提升16.6%,动态年费降低25.8%;重庆地区太阳能复合空气能热水系统的设计保证率宜按国家标准30%取值,不宜过高,设计保证率每增加3%,系统动态年计算费用平均增大4.8%,系统经济性下降。

The calculation model of the air-source heat pump assisted solar hot water system was presented firstly, then the performance of the system and the key influence factors were analyzed based on the measured meteorological data in Chongqing area. The results indicate that the annual mean COP of the air-source heat pump of the system is 5.59; the operation and economy performance of the system are significantly influenced by designed water supply temperature and solar fraction; the value of the solar water supply temperature should be designed at 50 ~C in Chongqing, the heat pump operation performance and the system economy performance will be reduced as the value of designed water supply temperature increases. Comparing with 60 ~C, the COP of the heat pump for the value of the water supply temperature of 50 ~C can be raised by 16.6%, the annual cost of the system can be reduced by 25.8% ; the value of the designed solar fraction of the solar water system should be set to 30% in Chongqing area according to the national standard, larger value is undesirable. There will be a 4.8% increase in the annual cost of the system for every 3% increase of the value of the solar fraction, the system economy performance decreased.