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A method for tuning unitary equipment models to improve system charge predictions.

Author(s) : SHEN B., BRAUN J. E., GROLL E. A.

Summary

For simulating the performance of unitary air conditioning and heat pumping equipment at design conditions, the amount of subcooling leaving the condenser is typically specified at design conditions and the required refrigerant charge necessary to achieve that subcooling is computed. For off-design conditions, the charge is fixed at the value determined for the design condition and the amount of subcooling is estimated. Previous studies have shown that existing models do not predict the effect of off-design charge very well, even when tuned at a design condition. The paper presents a method for tuning parameters associated with a charge correction equation that requires data for two operating points. The ability of a system model to predict off-design charge effects is significantly improved through the use of this tuning approach. This was confirmed through comparisons with measured results and predictions obtained from existing tuning approaches.

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Details

  • Original title: A method for tuning unitary equipment models to improve system charge predictions.
  • Record ID : 2005-0147
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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