Patent ID: 6385510
Filing Date: 2002-05-07
Classification: F24F

Abstract:
An apparatus for monitoring the performance of an HVAC unit having a heating mode and a cooling mode operation, said apparatus comprising:means for continuously monitoring air temperature and air humidity, the means for monitoring positioned to sense a real-time value for a supply air temperature, a return air temperature and a return air relative humidity for the HVAC unit, and responsively generating data outputs for said supply air temperature, said return air temperature and said return air relative humidity; a monitor processing unit constructed and arranged to receive said data outputs for the real-time values for both return air temperature and return air relative humidity in addition to supply air temperature during a selected one of the heating mode and cooling mode operations and responsively establishing a corresponding correction factor, said correction factor representing a difference between a theoretical ideal performance operation of said HVAC unit and a best actual performance operation of said HVAC unit, and responsively establishing an adjustable operating range based on said correction factor; and means for inputting data defining a selected operating range for the HVAC unit encompassing the adjustable operating range; said monitor processing unit being constructed and arranged to output a performance result of said HVAC unit when said HVAC unit operates outside the selected operating range.