Head pressure control system for refrigeration unit

Details Head pressure control system for refrigeration unit Head pressure control system for refrigeration unit

1987-03-02

1988-04-05

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62509, 62DIG17, F25B 4100

Patent

active

047350598

ABSTRACT:
An improved refrigeration system that has an air cooled condenser exposed to outdoor ambient conditions and which automatically maintains sufficient head pressure during cooler weather for adequate liquid flow to the expansion valve of the evaporator by backflooding the condenser. Sub-cooling of the liquid in the condenser results from the backflooding and this sub-cooled liquid is diverted through a bypass line around the receiver to a sub-receiver and thereby to the liquid line to the expansion valve. In warmer weather, the liquid or a liquid and gaseous mixture from the condenser can enter the receiver or the bypass line. The liquid line out of the receiver forms a drop leg and joins the bypass line at the sub-receiver at a sufficient elevation below the receiver so that the pressure due to the static head at the sub-receiver is greater than the pressure at the receiver, said pressure difference causing any gaseous and liquid mixture from the condenser to flow to the receiver. Therefore uncondensed (flash) gas does not enter the liquid line to the expansion valve.

REFERENCES:
patent: 3248895 (1966-05-01), Mauer
patent: 3478533 (1969-11-01), Kocher et al.
patent: 3844131 (1974-10-01), Gianni et al.
patent: 3905202 (1975-09-01), Taft
patent: 4068494 (1978-01-01), Kramer
patent: 4136528 (1979-01-01), Vogel et al.
patent: 4457138 (1984-07-01), Bowman
patent: 4566288 (1986-01-01), O'Neal

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