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Estimating operating parameters of vapor compression cycle equipment

  • US 6,701,725 B2
  • Filed: 05/10/2002
  • Issued: 03/09/2004
  • Est. Priority Date: 05/11/2001
  • Status: Expired due to Term
First Claim
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1. In vapor compression equipment having a compressor, a condenser, an expansion device and an evaporator arranged in succession and connected via a conduit in a closed loop for circulating refrigerant through the closed ioop, said equipment operating within its nominal vapor compression cycle parameters, a process for determining the operating efficiency of the system, the process comprising the steps of:

  • measuring liquid line pressure, suction line pressure, suction line temperature, and liquid line temperature;

    obtaining the suction dew point and discharge dew point temperatures from the suction line and liquid line pressures;

    obtaining the suction line superheat;

    obtaining the mass flow rate that corresponds to the compressor in the vapor compression cycle for the dew point temperatures and suction line superheat;

    obtaining the enthalpies at the suction line and at the inlet of the evaporator; and

    calculating the capacity of the vapor compression cycle from the mass flow rate and the enthalpies across the evaporator.

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