Patent ID: 9261542
Filing Date: 2016-02-16
CPC Classification: F25B

Claim Text:
1. A method for measuring an energy efficiency ratio and a coefficient of performance of a system comprising the steps of: measuring a first refrigerant temperature utilizing a first temperature sensor responsive to the first refrigerant temperature leaving an evaporator; generating a first input voltage signal having an amplitude proportional to the first refrigerant temperature; measuring a second refrigerant temperature utilizing a second temperature sensor responsive to the second refrigerant temperature leaving a condenser; generating a second input voltage signal having an amplitude proportional to the second refrigerant temperature; measuring a first refrigerant pressure utilizing a first pressure sensor responsive to the first refrigerant pressure leaving the condenser or entering the condenser; generating a third input voltage signal having an amplitude proportional to the first refrigerant pressure; measuring a second refrigerant pressure utilizing a second pressure sensor responsive to the second refrigerant pressure leaving the evaporator or entering a compressor; generating a fourth input voltage signal having an amplitude proportional to the second refrigerant pressure; calculating a first refrigerant enthalpy using the first input voltage and the third input voltage; calculating a second refrigerant enthalpy using the second input voltage and the fourth input voltage; generating a first input value proportional to the difference between the first refrigerant enthalpy and the second refrigerant enthalpy; measuring a refrigerant flow rate; generating a second input value proportional to the first input value multiplied by the refrigerant flow rate; measuring the electrical energy input to the system; generating a third input value proportional to the electrical energy input; calculating a ratio of the second input value to the third input value; generating an intermediate value indicative of a measured energy efficiency ratio and a coefficient of performance; and calculating and storing successive values of the intermediate value to generate an output value that is directly indicative of the measured integrated energy efficiency ratio.