Design recommendations for plate heat exchangers in heat pumps using pure and mixed refrigerants

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This paper aims at deriving design recommendations for plate heat exchanger (PHE) evaporators and condensers in heat pump (HP) systems using different refrigerants. A coupled HP - PHE simulation framework was used to carry out cycle and component design for a case study, with different combinations of PHE geometrical parameters, and propane, butane and propylene/butane (0.5/0.5) as refrigerants. An operating model subsequently evaluated the heat pump thermodynamic and economic performance with the different designed PHEs: the trade-off between heat transfer area and refrigerant pressure drops was therefore taken into account for both components. Only evaporator pressure drops affected the Coefficient of Performance (COP), and different refrigerants presented dissimilar slopes of degradation. Condenser design did not influence the COP, and the economic optimum corresponded to the lowest size. The evaporator design at minimum cost was instead found as a trade-off between heat transfer area and pressure drops for all the working fluids. Despite the different rates of COP drop, the three refrigerants resulted in the same optimal pressure drop at the evaporator, equal to around 5 kPa.
Original languageEnglish
Title of host publicationProceedings of the 25th IIR International Congress of Refrigeration
Number of pages8
PublisherInternational Institute of Refrigeration
Publication date2019
Article number853
DOIs
Publication statusPublished - 2019
Event25th IIR International Congress of Refrigeration (ICR 2019) - Montréal , Canada
Duration: 24 Aug 201930 Aug 2019

Conference

Conference25th IIR International Congress of Refrigeration (ICR 2019)
CountryCanada
CityMontréal
Period24/08/201930/08/2019

Bibliographical note

Copyright © IIF/IIR.
Published with the authorization of the International Institute of Refrigeration (IIR): www.iifiir.org

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    Research areas

  • Pressure drops, Zeotropic mixtures, Evaporators, Condensers, Economic analysis

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