Engelhard/icc

Dean S Calton

James A Coellner

Douglas C Scott

Paul R Heimann

Henry Y Mark

A method 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.

Method for creating a humidity gradient within an air conditioned zone

The present invention comprises a motor control system for controlling the speed of an electrical motor in an air temperature control system having a control signal determined in accordance with various loads of the air temperature control system. An electrical energy source provides electrical energy to the control system. A motor starter has a starter input coupled to the electrical energy source and a starter output coupled to the electrical motor for receiving the electrical energy from the electrical energy source and selectably applying the received electrical energy to the electrical motor. An inverter is directly coupled to the starter input and to the starter output to bypass the starter and provide a frequency signal to control the speed of the electrical motor according to the control signal. The motor operates in a high speed mode and in a reduced speed mode wherein the mode of operation of the motor is determined according to frequency signal. Sensors providing the control signal may be temperature sensors for sensing a temperature to be controlled or pressure sensors.

Step function inverter system

A hybrid air-conditioning system for controlling the condition of air in a building enclosed space. The hybrid air-conditioning system includes a rotatable moisture transfer wheel having first and second zones. The first zone is located in a process air flow and the second zone is located in a regenerative air flow. The second zone of the moisture transfer wheel has relatively wet and dry regions. A compressor having a suction side and a discharge side is provided. The suction side of the compressor is in fluid communication with a recovery evaporator coil, and the discharge side of the compressor is in fluid communication with a subcool condenser coil. The recovery evaporator coil is positioned such that the regenerative air flow through the dry region of the second zone of the moisture transfer wheel passes through the recovery evaporator coil. The subcool condenser coil is positioned such that the regenerative air flow through the wet region of the second zone of the moisture transfer wheel passes through the subcool condenser coil.

Hybrid air-conditioning system with improved recovery evaporator and

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. A second process evaporator located in series along the first path between the first process evaporator and the entrance to the enclosed space. A condenser is coupled with the compressor and located along the second path between the rotatable wheels. A recovery evaporator is also coupled with the compressor and located in series along the second path.

Desiccant assisted dehumidification and cooling system

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

Method of operating hybrid air-conditioning system with fast condensing

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. The second condenser coil has first and second coil sections, with the first coil section of the second condenser coil positioned between the first condenser coil and the second zone of the moisture transfer wheel and the second coil section of the second condenser coil positioned between the second zone of the moisture transfer wheel and the ambient space.

Hybrid air-conditioning system and method of operating the same

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.

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.

Method and apparatus for creating humidity gradients

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.

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Lavernia, TX, United States of America

Dean S Calton