Refrigeration – Processes – Reducing pressure on compressed gas
Patent
1994-05-24
1995-10-17
Sollecito, John M.
Refrigeration
Processes
Reducing pressure on compressed gas
62DIG17, 62DIG2, 62197, 621963, 62513, 62498, F25B 900
Patent
active
054579643
ABSTRACT:
This invention is a low pressure refrigeration or air-conditioning system comprising a compressor, a condenser and an evaporator interconnected in series in a closed loop for circulating refrigerant therethrough, and an improved subcircuit including a subcooler and centrifugal pump connected in series to recycle a portion of the liquid refrigerant from the condenser outlet back to the condenser inlet to desuperheat compressed refrigerant vapors. The subcooler receives a portion of the condensed liquid refrigerant from the outlet of the condenser at condenser outlet temperature and lowers that temperature by an increment of temperature, typically about 2.degree.-3.degree. F., to a temperature sufficiently lower than the condenser outlet temperature to prevent flashing of the refrigerant in the pump intake. The centrifugal pump receives the subcooled second portion of condensed liquid refrigerant and boosts its pressure by a pressure increment, typically 5-12 psi, to an injection pressure higher than the pressure of the compressed refrigerant vapor. The condensed and pressure-boosted liquid refrigerant is discharged from the pump into the condenser, or upstream thereof, to vaporize and cool the superheated vapor refrigerant to a reduced temperature, thereby reducing the vapor refrigerant to a saturated condition. The system can be a centrifugal compressor type system with a float valve gating refrigerant flow from the condenser, which is at one to two atmospheres, into the evaporator, which is at about one-half an atmosphere.
REFERENCES:
patent: 1946328 (1934-02-01), Neff
patent: 2967410 (1961-01-01), Schultze
patent: 4419865 (1983-12-01), Szymaszek
patent: 4599873 (1986-07-01), Hyde
patent: 5097677 (1992-03-01), Holtzapple
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