Oil return from evaporator to compressor in a refrigeration syst

Details Oil return from evaporator to compressor in a refrigeration syst Oil return from evaporator to compressor in a refrigeration syst

1997-02-18

1998-06-09

Sollecito, John M.

Refrigeration

Processes

Lubricant handling

62471, 62231, 62157, F25B 4302

Patent

active

057619140

ABSTRACT:
A refrigeration system employing a screw compressor and a falling film evaporator makes use of high-side pressure to drive lubricant, which escapes the compressor and collects as a lubricant-rich mixture of lubricant and refrigerant in the system evaporator, back to the compressor. The mixture is cyclically exposed to high-side pressure for a period of time which (i) varies in accordance with the difference between a sensed condenser-related pressure and a sensed evaporator-related pressure and (ii) is calculated to maintain a predetermined oil concentration in the lubricant-rich mixture in the evaporator so as to minimize the parasitic losses to system efficiency associated with the oil return process.

REFERENCES:
patent: 2246845 (1941-06-01), Durden
patent: 4715196 (1987-12-01), Sugiura
patent: 4843837 (1989-07-01), Ogawa et al.
patent: 4918944 (1990-04-01), Takahashi et al.
patent: 5086621 (1992-02-01), Starner et al.
patent: 5165248 (1992-11-01), Sishtla
patent: 5561987 (1996-10-01), Hartfield et al.

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