Patent ID: 9638472
Date: 2017-05-02
CPC Classifications: F24F,F28F

Claim:
1. An air conditioning system comprising a cooling coil having an inlet to receive chilled liquid water at a first temperature from a fluid chiller to cool and dehumidify air that passes over the cooling coil, and having an outlet to output spent chilled liquid water at a second temperature, the second temperature being greater than the first temperature due to heat exchange from the air to the chilled water; a fluid recovery conduit to receive the spent chilled liquid water from the outlet of the cooling coil; and a heating coil having an inlet to receive the spent chilled liquid water, the heating coil configured to cause heat exchange from the spent chilled fluid to the air previously passed over and cooled and dehumidified by the cooling coil as that air passes over the heating coil, the heat exchange caused by the heating coil resulting in cooling of the spent chilled liquid water to a third temperature before the spent chilled liquid water is returned to the fluid chiller, the third temperature being lower than the second temperature, further comprising a control system configured to control a plurality of control valves such that: operation of the cooling coil results in the air passing over the cooling coil achieving a supply air temperature sufficiently low to cause dehumidification while raising the second temperature of the spent cooled liquid water into a range of approximately 65° F. to 75° F. (approximately 18° C. to 25° C.); and operation of the heating coil results in the air passing over the heating coil being reheated to conform to occupant or process cooling loads while a cooling demand on the fluid chiller is reduced relative to the spent chilled liquid water at the second temperature.