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Investigation of ammonia-secondary fluid systems in supermarket refrigeration systems.

Author(s) : MCDOWELL T. P., MITCHELL J. W., KLEIN S. A.

Summary

R22 and ammonia (R717) are candidate replacement refrigerants for supermarket refrigeration having appropriate thermodynamic properties. The toxicity of ammonia at low concentrations requires that it be confined to the equipment room, so a secondary fluid is needed to distribute cooling to the refrigerated cases. The paper investigates ammonia-secondary fluid systems and compares their performance with equivalent R22 systems. Six secondary fluids were evaluated for use with ammonia in the supermarket system. The influence of different parameters on the overall system performance was studied in a systematic manner. From this parametric study, design rules leading to optimal ammonia-secondary fluid systems were developed. The performance of well-designed ammonia-secondary fluid systems was found to be 4 to 10% lower than that of R22 systems operating under similar conditions.

Details

  • Original title: Investigation of ammonia-secondary fluid systems in supermarket refrigeration systems.
  • Record ID : 1996-3318
  • Languages: English
  • Source: ASHRAE Transactions.
  • Publication date: 1995/06/24
  • Document available for consultation in the library of the IIR headquarters only.

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