Patent ID: 7654101

Claim:
A cooling arrangement for cooling and dehumidifying air in a conditioned space, including a return duct in which air from the conditioned space enters, a desiccant device for dehumidification of an airflow, an air-to-air heat exchanger in which air in a first pathway exchanges thermal energy with air in a second pathway therethrough, a heating element, first and second cooling coils for cooling the air and each being supplied with water from a source of cooling, and a supply air plenum from which conditioned air is sent back into the conditioned space; and wherein return air in said return air duct is divided and directed into separate first and second courses; a) wherein in said first course the return air passes through said desiccant device to remove humidity from the air, the air leaving the desiccant device passes through said first cooling coil to cool the air, and the air leaving the first cooling coil enters the supply air plenum; b) wherein the second course, the return air enters the first pathway through said air-to-air heat exchanger, the air leaving said first pathway is heated by said heater element and passes through said desiccant device to pick up humidity from the desiccant device, the air leaving the desiccant device passes through the second pathway through said air-to-air heat exchanger, and the air leaving the second pathway of said heat exchanger passes through said second cooling coil to cool and dehumidify the air in the second course, and the air exiting the second cooling coil passes to the supply air plenum where it mixes with the air of the first course, and then returns to the conditioned space.