Experimental Study on Heating Performance of Heat Pump Chiller under Overload, Frost and Defrost Conditions

Experimental Study on the Heating Performance of a CO2 Heat Pump with Gas Injection

With the increasing of the environmental concerns, carbon dioxide (CO2) as an alternative refrigerant has been investigated intensively. In this study, the heating performance of a transcritical CO2 heat pump system with a twinrotary compressor was investigated. The transcritical CO2 heat pump with gas injection was tested by varying gas injection ratio and outdoor temperature at the optimum re...

Experimental and theoretical study on a solar assisted CO2 heat pump for space heating

In this paper, a solar combi-system which consists of solar collector and a CO2 heat pump is investigated experimentally and theoretically. Two experiments are primarily conducted to show the performance of this solar combi-system under different operation conditions. A system model is developed and validated in TRNSYS to analyze the influence of main components parameters. Subsequently, a mult...

Experimental Investigations into Frost Formation on Display Cabinet Evaporators in Order to Implement Defrost on Demand

Residential Heat Pump Heating Performance with Single Faults Imposed

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

The objective of this study was to provide experimental data that could be used to predict frost growth and frost performance of a round plate fin-tube heat exchanger for low temperature heat pumps used in zero emission vehicles under cold weather conditions. In this study, round plate fin-tube heat exchangers were tested with variation of the fin space, air flow rate, relative humidity, and in...