1 Department of Mechanical Engineering, Technical University of Denmark 2 Thermal Energy, Department of Mechanical Engineering, Technical University of Denmark 3 Danfoss A/S 4 KTH - Royal Institute of Technology
This paper presents an approach to quantify the effect of evaporator maldistribution onoperating costs of air-water heat pumps. In the proposed simulation model maldistributionis induced by two parameters describing refrigerant phase and air flow distribution.Annual operating costs are calculated based on heat pump performance at distinct operatingconditions. Results show that percentage increase of operating costs is similar for thethree considered climate zones, even though the effect of maldistribution on heat pumpperformance varies with operating conditions. Differences in terms of absolute cost increasefor the climate zones arise mainly due to a varying number of operating hours.Absolute cost increase is considerable in the average and especially colder climate zoneand can only partly be reduced by enlarging the evaporator.© 2014 Elsevier Ltd and IIR. All rights reserved.
International Journal of Refrigeration, 2015, Vol 50
Heat pump; Maldistribution; Annual performance; System modeling; Operating costs
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