Trans-critical refrigerating unit
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United States of America Patent
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Issued Date -
Sep 29, 2005
app pub date -
Mar 14, 2005
filing date -
Mar 15, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a trans-critical refrigerating unit comprises a compressor 10, a gas cooler 154, a restriction means 156 and an evaporator 157 sequentially connected to each other, the trans-critical refrigerating unit using a refrigerant, which exhibits supercritical pressure on the high pressure side. In the unit, the compressor 10 includes compressing elements 32, 34 having a plurality of stages in a closed vessel 12, and after a discharge refrigerant in a lower-stage compressing element 32 in these compressing elements is discharged into the closed vessel 12 to dissipate heat, the refrigerant is further compressed by the subsequent-stage compressing element 34 to be discharged and a lubricating oil, which is compatible with said refrigerant and has a kinematic viscosity of 50 to 90 mm.sup.2/sec (@ 40.degree. C.), is used. According to the trans-critical refrigerating unit of the present invention, the occurrence of sliding loss and leak loss is extremely suppressed and the maximum COP can be obtained.
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