Patent ID: 6557771
Filing Date: 2003-05-06
Classification: F24F,G05D

Abstract:
An apparatus for cooperating with a controller for a climate control system, said controller activating the climate control system responsive to a composite error value encoded in a composite error signal falling within a preselected range of error values, said apparatus comprising:a humidity sensor providing a humidity temperature signal encoding at least one of the wet-bulb temperature and the dew point temperature; a temperature sensor providing an air temperature signal encoding the dry-bulb temperature value; a memory recording a dry-bulb temperature set point value and a humidity temperature set point value, and providing a set point signal encoding the dry-bulb and humidity temperatures set point values; a calculator receiving the humidity and air temperature signals and the set point signals, the calculator then computing the composite error value as a function of the values encoded in the humidity and air temperature signals and the set point signals, and for encoding the composite error value in the composite error signal; and wherein the composite error value is determined by: i) when the humidity temperature is less than zero, the composite error equals the dry-bulb temperature error, and ii) when the humidity temperature error is greater than zero the composite error equals the humidity temperature error.