Patent ID: 6694757
Filing Date: 2004-02-24
Classification: F24F

Abstract:
A method for cooling and dehumidifying an cooling and humidifying area to selected temperature and humidity values, said method comprising the steps of:routing an entering air stream including at least a portion from said air to an air handling device having a flow passage therethrough including an inlet for receiving an inlet air stream including at least a portion from said load and an outlet for discharging an outlet air stream to said load; providing a direct expansion cooling loop having a direct expansion cooling coil disposed in said flow passage adjacent said inlet for routing said inlet air stream therethrough, operating said expansion cooling coil to provide an expansion optimum dew point operating temperature for the exiting air stream from said direct expansion cooling coil above which icing on said direct expansion cooling coil is prevented; providing a chilled liquid cooling loop having a chilled liquid cooling coil in said flow passage downstream of said expansion cooling coil and receiving the exiting air stream therefrom; operating said chilled liquid cooling coil at a chilled liquid optimum dew point operating temperature for the exiting air stream from said liquid cooling coil above which icing on said chilled liquid cooling coil is prevented; and reheating the air stream exiting said chilled liquid cooling coils to raise the temperature thereof; and delivering a dehumidified and conditioned air stream through said outlet to said load.