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A method for tuning refrigerant charge in modelling off-design performance of unitary equipment (RP-1173).

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

Type of article: Article

Summary

Existing models do not accurately predict the effect of off-design refrigerant charge even when tuned at the design operating condition. Based on experimental testing and theoretical analyses, multiple factors that cause inaccuracies in charge prediction are identified in this paper. The factors include unaccounted liquid volumes, refrigerant dissolved in the compressor lubricant, inaccurate void fraction models, and an inaccurate estimate of the subcooled liquid length. Some of these factors lead to errors that change with operating conditions and amount of charge. The paper presents a method for adjusting refrigerant charge using a charge correction equation that requires data for two operating points for parameter tuning.

Details

  • Original title: A method for tuning refrigerant charge in modelling off-design performance of unitary equipment (RP-1173).
  • Record ID : 2006-2583
  • Languages: English
  • Source: HVAC&R Research - vol. 12 - n. 3
  • Publication date: 2006/07

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