Experimental validation of heat exchanger models for refrigerator/freezers

David M. Admiraal, Clark W. Bullard

Research output: Contribution to journalConference articlepeer-review

Abstract

Separate experiments with a condenser and an evaporator showed that changes in refrigerant-side heat transfer coefficients produced variations in overall heat transfer resistance of up to 20% over a wide range of operating conditions. An extensively instrumented refrigerator was used to gather air- and refrigerant-side temperature, pressure, power, and refrigerant mass flow measurements to provide in situ calorimetry for 95 operating conditions. These operating conditions included three different refrigerator charges that provide a variety of evaporator and condenser outlet conditions. Accounting for the variation in refrigerant-side heat transfer coefficients produced better results than assuming that the heat transfer coefficients were constant. The variable-conductance models developed here can be used to predict changes in performance resulting from the use of alternative refrigerants and different heat exchanger tube dimensions.

Original languageEnglish (US)
Pages (from-to)34-43
Number of pages10
JournalASHRAE Transactions
Issue number1
StatePublished - 1995
Externally publishedYes
EventProceedings of the 1995 ASHRAE Annual Meeting - Chicago, IL, USA
Duration: Jan 29 1995Feb 1 1995

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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