A dynamic model of a vapor compression cycle with shut-down and start-up operations

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Abstract

This paper presents an advanced switched modeling approach for vapor compression cycle (VCC) systems used in Air Conditioning and Refrigeration. Building upon recent work (McKinley and Alleyne, 2008), a complete dynamic VCC model is presented that is able to describe the severe transient behaviors in heat exchangers (condenser/evaporator), while maintaining the moving-boundary framework, under compressor shut-down and start-up operations. The heat exchanger models retain a constant structure, but accommodate different model representations. Novel switching schemes between different representations and pseudo-state variables are introduced to accommodate the transitions of dynamic states in heat exchangers while keeping track of the vapor and liquid refrigerant zones during the stop-start transients. Two model validation studies on an experimental system show that the complete dynamic model developed in Matlab/Simulink can well predict the system dynamics in shut-down and start-up transients.

Original languageEnglish (US)
Pages (from-to)538-552
Number of pages15
JournalInternational Journal of Refrigeration
Volume33
Issue number3
DOIs
StatePublished - May 2010
Externally publishedYes

Bibliographical note

Funding Information:
The authors wish to thank the financial support of the sponsoring companies of the Air Conditioning and Refrigeration Center at the University of Illinois at Urbana-Champaign, and also thank Neera Jain and Tom McKinley for providing useful suggestions for the manuscript preparations.

Keywords

  • Comparison
  • Compression system
  • Condenser
  • Evaporator
  • Experiment
  • Heat exchanger
  • Modelling
  • Pressure
  • Refrigeration system
  • Régulation
  • Simulation
  • Transient state

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