Refrigeration – Automatic control – Refrigeration producer
Patent
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.
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patent: 4457138 (1984-07-01), Bowman
patent: 4566288 (1986-01-01), O'Neal
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