Abstract
This paper analyses the experimental preliminary results of a high-temperature heat pump (HTHP) prototype for low-grade waste heat recovery. HFC-245fa was selected as a working fluid to establish the baseline operation for future analyses of low global warming potential (GWP) alternative refrigerants. The HTHP experimental test reached a production temperature of 140 oC. Moreover, the theoretical analysis shows the expected performance and the influence of the IHX for heat sources from 70 to 100oC, the typical temperature range for the refrigeration jackets fluid of CHP systems. The theoretical IHX influence analysis shows that heating capacity and COP increase by about 22% and 16.5%, respectively, with the use of this component. Finally, the experimental setup gets a coefficient of performance (COP) of 2.23 for waste heat temperature (heat source) of 80 oC and production temperature (heat sink) of 140 oC.
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