The catalog for a refrigerant 22, four cylinder, hermetic compressor operating at 29 r/s, a condensing temperature of 40, and an evaporating temperature of -4 shows a refrigerating capacity of 115 kW. At this operating point the motor (whose efficiency is 90%) draws 34.5 kW. The bore of the cylinders is 87 mm and the piston stroke is 70 mm. The performance data are based on 8 of subcooling of the liquid leaving the condenser. Compute (a) the actual volumetric efficiency and (b) the compression efficiency.
The catalog for a refrigerant 22, four cylinder, hermetic compressor operating at 29 r/s, a condensing temperature of 40, and an evaporating temperature of -4 shows a refrigerating capacity of 115 kW. At this operating point the motor (whose efficiency is 90%) draws 34.5 kW. The bore of the cylinders is 87 mm and the piston stroke is 70 mm. The performance data are based on 8 of subcooling of the liquid leaving the condenser. Compute (a) the actual volumetric efficiency and (b) the compression efficiency.
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter36: Refrigeration Applied To Air-conditioning
Section: Chapter Questions
Problem 8RQ: The most popular refrigerant used in the past for residential air-conditioning is R- ________.
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The catalog for a refrigerant 22, four cylinder, hermetic compressor operating at 29 r/s, a condensing temperature of 40, and an evaporating temperature of -4 shows a refrigerating capacity of 115 kW. At this operating point the motor (whose efficiency is 90%) draws 34.5 kW. The bore of the cylinders is 87 mm and the piston stroke is 70 mm. The performance data are based on 8 of subcooling of the liquid leaving the condenser. Compute (a) the actual volumetric efficiency and (b) the compression efficiency.
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