A 5 ton refrigeration system operates on a vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. The refrigerant enters the compressor as a saturated vapor at 360 kPa and is compressed to 1.6 MPa with a compressor outlet temperature of 70°C. Also, it enters the throttling valve as a saturated liquid. Determine the quality of the refrigerant at the end the throttling process determine the isentropic efficiency of the compressor determine the coefficient of performance and determine the compressor input power Draw the cycle on a T-s diagram with respect to the saturation lines [Note: A "ton" of refrigeration is a term used in the air conditioning industry. Historically, it is the rate of cooling necessary to freeze one ton (2000 lbm) of water in 24 hours. Using the "latent heat" of fusion, the mass and the time, this cooling rate works out to be 12,000 Btu/h = 3.517 kW.]
A 5 ton refrigeration system operates on a vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. The refrigerant enters the compressor as a saturated vapor at 360 kPa and is compressed to 1.6 MPa with a compressor outlet temperature of 70°C. Also, it enters the throttling valve as a saturated liquid. Determine the quality of the refrigerant at the end the throttling process determine the isentropic efficiency of the compressor determine the coefficient of performance and determine the compressor input power Draw the cycle on a T-s diagram with respect to the saturation lines [Note: A "ton" of refrigeration is a term used in the air conditioning industry. Historically, it is the rate of cooling necessary to freeze one ton (2000 lbm) of water in 24 hours. Using the "latent heat" of fusion, the mass and the time, this cooling rate works out to be 12,000 Btu/h = 3.517 kW.]
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
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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