GB1138503A - Refrigeration system - Google Patents

Abstract

1,138,503. Refrigerating. CARRIER CORP. 9 March, 1966, No. 10383/66. Heading F4H. In a refrigeration system having a compression-condensation circuit, the compressor is driven by a turbine in a steam/water circuit, and a purge system includes a separator which alternately discharges water and refrigerant to their appropriate circuits. As illustrated, the power circuit includes a steam generator 12, the turbine of a turbo-compressor 11, a condenser 16, and a condensate receiver 17. Condensate from the receiver 17 is passed by a pump 18 and the generator, and, through a line 33, to the turbo-compressor as lubricant. The refrigeration circuit includes the compressor of the turbo-compressor 11, a condenser 23, an expansion valve 24<SP>1</SP>, and an evaporator 25 which operates at a higher pressure than the steam condenser 16. Cooling tower water is supplied through a line 37 to cool the two condensers and a heat exchanger 34 in the water line between the pump 18 and the turbocompressor 11. The latter line has a branch 42 driving a jet pump 41 which withdraws vapour from the receiver 17 and passes it to a separator 44. Any refrigerant present in the vapour due to leakage in the turbo-compressor collects as vapour 46 above the water 45 in the separator 44. A water discharge line 50 from the separator 44 to the receiver 17 includes a normally open valve 51 so that as the jet pump 41 operates the refrigerant volume 46 increases and the water level in the separator falls until it reaches a probe 52 which then closes the valve 51 and opens a valve 52 in a refrigerant discharge line 53 from the separator 44 to the evaporator 25. Refrigerant is accordingly discharged from the volume 46 to the evaporator and the water level in the separator 44 rises until it reaches a probe 54 which closes the valve 52 and reopens the valve 51 for repetition of the purge cycle. Any water collecting on the surface of refrigerant in the evaporator 25 drains over a weir 55 into a sump 56. When the water level in the sump 56 rises to a probe 59 a, valve 58 in a water discharge line 57 to the receiver 17 is opened and water is passed through the line 57 by the pressure in the evaporator until the water level in the sump 56 falls to the level of a probe 60 when the valve 58 is closed. The evaporator 25 chills a tube bundle 26 whose output temperature is sensed by a sensor 28 to control the burners 30 heating the steam generator 12.