Refrigeration – Processes – Lubricant handling
Patent
1990-07-10
1991-09-24
Tanner, Harry B.
Refrigeration
Processes
Lubricant handling
62175, 62193, 62203, 62227, 62468, 62DIG2, F25B 4302
Patent
active
050503898
ABSTRACT:
A refrigeration system (10) having a compressor rotor (20) rotatably supported by a plurality of hydrodynamic bearings (22 and 24) lubricated by oiless pressurized liquid refrigerant and pressurizing refrigerant which flows to a condenser (34) providing liquid refrigerant which flows to an evaporator (68) in fluid communication with the condenser and the compressor in accordance with the invention includes a refrigeration circuit (36) coupled to the compressor, for providing pressurized refrigerant to the hydrodynamic bearings from the compressor and to the evaporator; a bearing pump (26), coupled to the refrigerant circuit and to the condenser, for providing pressurized refrigerant to the refrigeration circuit; a first temperature sensor (101) sensing a temperature Tsink of a heat exchange fluid at the condenser and providing a temperature signal representative of the temperature Tsink of the heat exchange fluid at the condenser; a second heat exchange sensor (103) sensing a temperature Tsource of a heat exchange fluid at the evaporator and providing a temperature signal representative of the temperature Tsource of the heat exchange fluid at the evaporator; and a controller (28 ), coupled to the temperature sensors, for controlling activation of the compressor and bearing pump as a function of the temperature signals to provide for three modes of operation with the first mode of operation being activation of only the compressor, the second mode of operation being activation of the bearing pump and the compressor and the third mode of operation being activation of only the bearing pump.
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"A New Technology in Energy-Efficient Electrically Driven Aircraft Environmental Control Systems" authored by W. Cloud, J. McNamara and David B. Wigmore, presented at the 21st IECEC Conference, Aug. 25-29, 1986, Article #869390 American Chemical Society, pp. 1696-1702.
Blain Edward S.
Lentz John C.
Waters Peter D.
Wigmore David B.
Sundstrand Corporation
Tanner Harry B.
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