Exergetic performance analysis of heat pumps: two alternative approaches

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Abstract

This paper evaluates the performance of a compressor driven and an absorption heat pump on the basis of exergy analysis using two different approaches. Approach 1 is based on the calculation of the effective heat absorbing and emitting temperatures and the entropy generation rate. Approach 2 is based on the commonly used exergy analysis where the real ambient temperature is used. The main goal is to analyze how these two approaches differ from each other. Approach 1 gives the exact improvement potential (Wreal - Wmin) of the heat pump while Approach 2 underestimates it. The average flow temperature also approximates the correct improvement potential with sufficient accuracy when temperature change of the flow is relatively small. Both approaches can be used when performances of heat pumps are compared. Both approaches also give a more realistic view of the performance than the commonly used COP, especially regarding the absorption heat pump.
Original languageEnglish
Pages (from-to)182-199
JournalInternational Journal of Exergy
Volume30
Issue number2
DOIs
Publication statusPublished - 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • rational ratio
  • exergy efficiency
  • irreversibility rate
  • CPO
  • absorption heat pump
  • compressor driven heat pump

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