Defrost for air handling system utilizing direct expansion cooli

Details Defrost for air handling system utilizing direct expansion cooli Defrost for air handling system utilizing direct expansion cooli

1992-04-30

1992-12-15

Sollecito, John

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62183, 62140, F25D 2106

Patent

active

051706350

ABSTRACT:
A system for controlling the operation of an HVAC system which includes a direct expansion coil, a condenser, a pre-cool coil, and a control system. The control system includes a controller and sensors. The controller receives signals indicative of air flow through the direct expansion coil from the sensors, compares the received signal to a stored air flow rate, and disables the compressor if the stored air flow rate is equal to or greater than the stored value. The controller is also adapted to vary air flow into an occupied space for small changes in the cooling load. In addition, the controller can artificially load the compressor during periods of small cooling load by restricting flow of a cooling agent between the cooling tower and the condenser, or by directing warm water from the condenser through the pre-coil coil.

REFERENCES:
patent: 4144722 (1979-03-01), Mattwell
patent: 4311498 (1982-01-01), Miller

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