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Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers

Sammendrag

Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: The first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat exchangers with an additional brine-to-air heat exchanger. Each system was considered to be able to work reversibly, with 5 design cooling capacity in summer and 8 design heating capacity in winter. Two separately developed simulation codes were used to calculate the required refrigerant charge and the efficiency of each of the systems. The charge was reduced by the use of microfinned tubes up to 22% in direct system reduced using microfinned tubes compared to the smooth tube. For the indirect system using specially designed plate heat exchangers with the minimum internal volume, their charge was reduced by up to 66% compared to normal plate heat exchangers. © 2021 by the authors.
Author keywords
Heat exchanger; Hydrocarbon; Optimization; System charge

Kategori

Vitenskapelig artikkel

Oppdragsgiver

  • Research Council of Norway (RCN) / 257632

Språk

Engelsk

Forfatter(e)

Institusjon(er)

  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Energi AS / Gassteknologi
  • Fraunhofer-Institut für Solare Energiesysteme ISE
  • SINTEF Energi AS / Termisk energi

År

2021

Publisert i

Energies

ISSN

1996-1073

Forlag

MDPI

Årgang

14

Hefte nr.

15

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