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ADVANTAGES AND LIMITATIONS OF THE THORP METHOD OF CROSS-CHECKING WATER CHILLER PERFORMANCE.

Author(s) : BAILEY-MCEWAN M.

Summary

WHEN THE PERFORMANCE OF A MACHINE IS EVALUATED, THE RESULTS ARE USUALLY ACCEPTED IF THEY YIELD AN ACCEPTABLE HEAT BALANCE. IF THE HEAT BALANCE IS NOT ACCEPTABLE, A CROSS-CHECK KNOWN AS THE THORPMETHOD (BASED ON AN INDEPENDENT ESTIMATE OF COP FROM MEASUREMENTS IN THE REFRIGERANT CIRCUIT) IS INVOKED TO TRY TO IDENTIFY THE LARGEST ERROR. THIS METHOD CAN ONLY BE USED WITH CENTRIFUGAL WATER CHILLERS WHICH ARE NOT BYPASSING HOT GAS TO KEEP THE COMPRESSOR STABLE. UNFORTUNATELY, THE THORP METHOD DOES NOT DETECT ALL CLASSES OF UNACCEPTABLE ERRORS, SO IT CAN NEVER PROVE THAT SUCH ERRORS ARE ABSENT. ADDITIONAL INFORMATION, PREFERABLY ONE CONSTITUENT OF THE HEAT BALANCE KNOWN ACCURATELY ENOUGH, MUST BE USED TO CONFIRM ACCEPTABLE ACCURACY OF THE PRINCIPAL MEASUREMENTS, OR TO IDENTIFY THE SOURCES OF UNACCEPTABLE ERRORS THEREIN.

Details

  • Original title: ADVANTAGES AND LIMITATIONS OF THE THORP METHOD OF CROSS-CHECKING WATER CHILLER PERFORMANCE.
  • Record ID : 1991-2262
  • Languages: English
  • Publication date: 1990/04/23
  • Source: Source: ASHRAE-FRIGAIR '90, Pretoria
    vol. 2; pap. M.14; 16 p.; 3 tabl.; 12 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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