Patent ID: 6701725
Filing Date: 2004-03-09
Classification: F25B

Abstract:
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.