Patent ID: 7328852

Claim:
A method for estimating an actual temperature of air discharged from a heat exchanger of an HVAC system, comprising the steps of: calculating a heat exchanger efficiency based on a first set of actual operating parameters of said HVAC system; and calculating estimate of said actual temperature of air discharged from said heat exchanger based on the calculated heat exchanger efficiency and a second set of sctual operating parameters of said HVAC system; wherein said HVAC system includes an evaporator for conditioning inlet air and a coolant flowing through said heat exchanger further conditions air discharged from said evaporator, said method including the step of: calculating estimate of said actual temperature of air discharged from said heat exchanger based on the calculated heat exchanger efficiency, a temperature of said coolant, and a difference between the temperature of the coolant and a temperature of the air discharged from said evaporator.