Patent ID: 7980087
Filing Date: 2011-07-19
Classification: F24F,F25B

Abstract:
1. A method of selectively operating a refrigerant system in at least one of a cooling mode and a reheat mode, wherein the refrigerant system can circulate a refrigerant through a compressor, a condenser, an evaporator in heat exchange relationship with a stream of air, a reheat coil, and an expansion valve, the method comprising: placing the reheat coil in heat exchange relationship with the stream of air with the reheat coil being downstream of the evaporator with respect to the stream of air; during the reheat mode, monitoring a level of subcooling occurring in the reheat coil; establishing a subcooling target; comparing the level of subcooling to the subcooling target, thereby determining whether the level of subcooling during the reheat mode is above the subcooling target, below the subcooling target, or at the subcooling target; when the level of subcooling is above the subcooling target during the reheat mode, shifting refrigerant out of the reheat coil and into the condenser by conveying refrigerant from the reheat coil into the evaporator via bypassing the expansion valve; when the level of subcooling is below the subcooling target during the reheat mode, shifting liquid refrigerant out of the condenser and into the reheat coil by momentarily conveying refrigerant from the condenser to the evaporator via a route that bypasses the expansion valve; and when the level of subcooling is at the subcooling target during the reheat mode, trapping a substantially fixed amount of refrigerant in the condenser.