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Accurate charge inventory modeling for unitary air conditioners.

Author(s) : HARMS T. M., GROLL E. A., BRAUN J. E.

Type of article: Article

Summary

Charge inventory, the accounting of the distributed fluid mass in closed systems, is necessary in order to predict system performance under different environmental conditions for a given charge. Public domain simulation models used to predict unitary equipment performance are currently unable to accurately determine charge inventory. Sources of error in these models include incomplete internal volume accounting, neglected refrigerant-oil diffusion effects, and void fraction modelling assumptions. The results presented here suggest that the most important charge inventory issue is proper void fraction determination. The Baroczy void fraction correlation gave the best agreement with measured data for three unitary air conditioners. As the condenser holds by far the largest percentage of the total charge, accurate prediction of heat transfer and pressure drop in the condenser was found to be necessary for charge inventory modelling.

Details

  • Original title: Accurate charge inventory modeling for unitary air conditioners.
  • Record ID : 2004-2432
  • Languages: English
  • Source: HVAC&R Research - vol. 9 - n. 1
  • Publication date: 2003/01
  • Document available for consultation in the library of the IIR headquarters only.

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