Simulating an evaporator field for large-scale air-source heat pumps subjected to frosting and defrosting.

Jonas Kjær Jensen*, Svenn Ole Kjøller Hansen, Wiebke Brix Markussen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Defrosting of air source heat pump evaporator fields is necessary for securing fault-free operation of the heat pump. However, it should be secured that the defrost procedure decreases the performance of the heat pump as little as possible. This paper presents a simulation model of an evaporator field consisting of several parallel evaporator units operating under frosting conditions. A simple defrost strategy was applied, where two evaporator units are taken out for defrost at a time. The results show that the spatial distribution of frost accumulation and subsequent refrigerant- and airflow maldistribution on the unit level had a minor effect on the overall performance of the evaporator field. On the other hand, the distribution of heat load and fan power between the individual units of the evaporator field was significant and the overall performance should be modeled based on the entire field and not based on a single unit.
Original languageEnglish
Title of host publicationProceedings of the 26th IIR International Congress of Refrigeration
Number of pages12
PublisherInternational Institute of Refrigeration
Publication date2023
Article number0363
ISBN (Electronic)978-2-36215-056-2
DOIs
Publication statusPublished - 2023
Event26th International Congress of Refrigeration - Paris Congress Center, Paris, France
Duration: 21 Aug 202325 Aug 2023

Conference

Conference26th International Congress of Refrigeration
LocationParis Congress Center
Country/TerritoryFrance
CityParis
Period21/08/202325/08/2023
SeriesScience et Technique du Froid
ISSN0151-1637

Keywords

  • Heat pumps
  • Evaporator
  • Modelling
  • Frosting
  • Defrost strategy

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