Abstract: A desiccant assisted system for dehumidification and cooling of an enclosed space comprising a rotatable desiccant wheel and a rotatable heat exchange wheel. A first path for process air extends from an exit of the enclosed space to be conditioned in series through a first zone of the rotatable desiccant wheel, a first zone of the rotatable heat exchange wheel and an entrance to the enclosed space. A second path for regenerative air extends from an entrance to ambient air outside the enclosed space in series through a second zone of the rotatable heat exchange wheel, a second zone of the rotatable desiccant wheel and an exit back to ambient air outside the enclosed space. Condenser coil(s) are provided along the second, regeneration air path between the rotatable wheels. A compressor is provided and a first process evaporator is coupled with the compressor and located along the first path.

Abstract: A method of operating a hybrid air-conditioning system for fast start-up for controlling the condition of air in a building enclosed space.

Abstract: A hybrid air-conditioning system for controlling the condition of air in a building-enclosed space includes a first fan for passing process air from an ambient space through a first pre-cool evaporator coil, through a first zone of a rotatable moisture transfer wheel and then through a first zone of a rotatable heat exchange wheel to an enclosed and conditioned space. A second fan passes regenerative air from the enclosed and conditioned space through a second zone of the heat exchange wheel, through a first condenser coil, through a second zone of the moisture transfer wheel and then to the ambient space. The system further includes first and second compressors. The first compressor is in fluid communication with the first pre-cool evaporator coil and with the first condenser coil. The second compressor has a suction side in fluid communication with a second pre-cool evaporator coil and with a second condenser coil.

Abstract: A hybrid air-conditioning system for controlling the condition of air in a building-enclosed space includes a first fan for passing process air from an ambient space through a first pre-cool evaporator coil, through a first zone of a rotatable moisture transfer wheel and then through a first zone of a rotatable heat exchange wheel to an enclosed and conditioned space. A second fan passes regenerative air from the enclosed and conditioned space through a second zone of the heat exchange wheel, through a first condenser coil, through a second zone of the moisture transfer wheel and then to the ambient space. The system includes a first compressor having a suction side in fluid communication with a first side of the first pre-cool evaporator coil and a discharge side in fluid communication with a first side of the first condenser coil. The second side of the first pre-cool evaporator coil is in fluid communication with a second side of the first condenser coil.

Abstract: A method and apparatus for modulating humidity across large single-zone air conditioned spaces such as those typically found in supermarkets wherein conventional air conditioning means and a desiccant unit are combined to supply varying levels of humidity to different regions within the single-zone space.

Abstract: An energy-efficient space conditioning system comprising an integrated direct expansion heat pump with desiccant and thermal exchange wheels. A method is disclosed for controlling the system to have four distinct modes of operation: Heating, Cooling/Regneration, Coil Defrost, and Regeneration.