Transport refrigeration system with secondary condenser and maxi

Details Transport refrigeration system with secondary condenser and maxi Transport refrigeration system with secondary condenser and maxi

1989-02-15

1990-02-27

Tanner, Harry B.

Refrigeration

Processes

Defrosting or frost inhibiting

621964, 62197, 62224, 62278, 623246, F25B 1300, F25D 2106

Patent

active

049034952

ABSTRACT:
A transport refrigeration system, and method of operating same, in which a maximum operating pressure expansion valve and a secondary condenser are used to enhance hot gas heating cycles initiated to hold a predetermined temperature set point, and hot gas defrost cycles. The secondary condenser is disposed in an evaporator section of the refrigeration system, with hot discharge gas from a compressor being directed to the secondary condenser during heating and defrost cycles. A sufficient supply of refrigerant for heating and defrost cycles is ensured by injecting refrigerant from a receiver and condenser into an active heat cycle refrigerant circuit, when the active refrigerant is insufficient to build the pressure on the low pressure side of the refrigeration system to a value sufficient to close the maximum operating pressure expansion valve and the compressor suction pressure is less than the receiver/condenser pressure.

REFERENCES:
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patent: 4774813 (1988-10-01), Yokoyama

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