Abstract
Vuilleumier cycle heat pump (VM) has highest efficiency among all heat driven cycle. In this paper, solar, geo-thermal and biomass energy are investigated as input thermal energy to driven VM cycle heat pump. Fuzzy comprehensive evaluation method is applied to evaluate system performances. Initial investment of the system (IS), system reliability (RS), environmental protection of system (EP), VM exergy efficiency (EE) and VM coefficient of performance (COP) are selected as main evaluation indexes. For all the three renewable input energy, system are scored good, solar driven is better than the other two.
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