The present invention relates generally to a humidity control application for a cooling system. More specifically, the present invention relates to a method for performing humidity control using a hot gas reheat coil in a two stage cooling unit.
Some refrigeration systems use a hot gas re-heat control to perform humidity control for an interior space. A hot gas re-heat coil is placed immediately adjacent to an evaporator and receives air from the evaporator. When humidity control is required, the refrigerant from the compressor is passed through the re-heat coil instead of the condenser so that the re-heat coil can operate as a condenser to heat and further dehumidify the air passing over the re-heat coil. Once the system enters a humidity control mode, there is essentially no cooling of the air for the interior space because the air being cooled by the evaporator is then being heated by being passed over the re-heat coil. Some examples of previous systems for providing humidity control are provided below.