Refrigeration – Processes – Employing diverse materials or particular material in...
Patent
1998-09-09
1999-12-14
Bennett, Henry
Refrigeration
Processes
Employing diverse materials or particular material in...
62470, F25B 4100
Patent
active
060002336
ABSTRACT:
In a CO.sub.2 refrigerant cycle, a lubricating oil for a compressor has a compatibility relative to CO.sub.2 refrigerant, and the compatibility of the lubricating oil relative to the CO.sub.2 refrigerant at a pressure lower than a critical pressure of the CO.sub.2 refrigerant is lower than that at a pressure higher than the critical pressure of the CO.sub.2 refrigerant. Thus, in a low-pressure side such as an accumulator of the CO.sub.2 refrigerant cycle, because a liquid lubricating oil is separated with a liquid CO.sub.2 refrigerant, only the lubricating oil can be readily introduced into a suction side of the compressor, and it can prevent the liquid CO.sub.2 refrigerant from being sucked into the compressor. As a result, it can prevent a damage to the compressor while preventing deterioration of coefficient of performance of the CO.sub.2 refrigerant cycle.
REFERENCES:
patent: 4187695 (1980-02-01), Schumaker
patent: 5689880 (1997-11-01), Petty
patent: 5799503 (1998-09-01), Koda et al.
Kuroda Yasutaka
Nishida Shin
Sakakibara Hisayoshi
Bennett Henry
Denso Corporation
Drake Malik N.
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