吸收式热泵辅助的太阳能-地热多联产系统4E研究

4E Research on Solar-Geothermal Poly-generation System Assisted by Absorption Heat Pump

为实现在有限地热资源条件下,通过改变运行策略调整冷热电比例以满足用户需求,提出了一种多热泵辅助低温地热能的冷、热、电三联供系统(CCHP)。从热效率、[火用]效率、[火用]经济性成本和二氧化碳减排量4个角度对系统进行了性能分析。结果表明:该系统在有限地热供给条件下,通过调整热泵组的运行方式,可以灵活调配用户的冷、热、电需求;在设计制冷工况下,系统热效率和[火用]效率分别为37.7%和12.15%;在设计供热工况下,系统热效率和[火用]效率分别为53.44%和40.68%,[火用]经济性分析表明制冷水成本为1.98元/(kW·h),供热水成本为0.81元/(kW·h);与传统燃气锅炉相比,在环境友好程度上,设计制冷与供热工况每吨地热水可减排二氧化碳量分别为7.5 kg/h和11.6 kg/h。

In order to meet the requirements of users by adjusting the proportion of cooling,heating and power via different operation strategies under the condition of limited geothermal resources,one kind of solar-geothermal poly-generation system of combined cooling,heating and power(CCHP)was proposed,in which low-temperature geothermal energy could be utilized with the assistance of hybrid absorption heat pump.The performance of the system was analyzed from four aspects of thermal efficiency,exergy efficiency,exergy economic cost and CO;emission reduction.Results show that under the condition of limited geothermal supply,users’cooling,heat and power demand can be allocated via the system by adjusting the operation mode of the heat pump group.Thermal efficiency and exergy efficiency of the system are 37.7%and 12.15%,respectively under designed refrigeration condition while they are 53.44%and 40.68%,respectively under designed heating condition.The exergy economic analysis shows that the cost of supplying cooling water is 1.98 yuan/(kW·h)and the cost of supplying hot water is 0.81 yuan/(kW·h).Compared with traditional gas-fired boilers,in terms of environmental friendliness,CO;emission per ton of geothermal water for the system can be reduced by 7.5 kg/h and 11.6 kg/h,respectively under designed refrigeration and heating conditions.