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Economics Analysis of Hybrid Ground Source Heat Pump Systems with Cooling Tower as a Supplemental Heat Rejecter

LI Kai-yuan,WANG Jing-gang(Academy of Urban Construction,Hebei Engineering University,Handan 056038,China)  
The COP of the ground source heat pump is higher than that of the air source heat pump because of the impact of the soil annual temperature change characteristics.For some cooling-dominated buildings,if the peak load of cooling is supplied only by ground exchanger,the ground source heat pump cycle coefficient is lower and initial investment cost of the system is higher.Therefore,the supplemental heat rejecter,such as cooling towers,can be utilized as assisted source to reject more heat to the air and effectively reduce investment cost of the system.In period of part cold load,the system operation just depends on the ground source.And in period of larger peak load or cold load,the system can operate cooperating with the supplemental heat rejecter.The research results show that the hybrid ground source heat pump has superiority to initial cost and operation cost.
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