Wylain, Inc.

Roger W Dougan

Roger C Ansted

James M Tucker

Jackob Swartzon

A combined environmental and refrigeration system for use in a supermarket or the like includes a plurality of environmental and refrigeration modules and controllable air flow dampers to provide selected air flow modes to a conditioned space. Each module includes a hot deck compartment having a fan and the condenser portion of a refrigeration system to heat an air flow through the hot deck compartment, and a cold deck compartment having the evaporator portion of an air conditioning system to cool the air supplied to the conditioned space. At least a portion of the condenser in one of the hot deck compartments is provided to sub-cool the refrigeration system working fluid. The various fans, evaporators, condensers, and dampers are controlled by suitable control means to provide a conditioned space dehumidification mode, and a plurality of conditioned space cooling and heating modes. The system permits precise four season environmental control of the conditioned space while increasing the efficiency of the refrigeration system by reclaiming the heat rejected by the refrigeration cycle and sub-cooling the refrigeration system working fluid during the dehumidification and heating modes.

Combined environmental and refrigeration system

A method and apparatus for initiating the defrost of refrigeration equipment on demand. A defrost clock which normally controls the conventional refrigeration and defrost modes of a refrigeration system includes an auxiliary switch to cease operation of the clock motor a predetermined time prior to normal defrost initiation. The defrost clock thus remains in the refrigeration mode until the demand defrost sensor switch, or an optional demand switch, initiates a defrost cycle of the refrigeration equipment. The closure of the demand defrost switch or the optional switches causes the defrost clock motor to run for a predetermined short period of time. The defrost clock switch subsequently closes slightly prior to initiation of a defrost to guarantee that the clock runs throughout the defrost mode. Thereafter, the defrost clock controls the length of the defrost and will terminate defrost upon a signal from a thermostat, or by a time signal, or a pressure signal. The auxiliary switch remains closed after termination to allow the defrost clock to repeat the previous sequence of operation.

Growing community of inventors

San Antonio, TX, United States of America

Roger W Dougan