Consider a heat pump that operates on the vapor compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 100 kPa, and exits at 900 kPa and 70°C, and leaves the condenser as saturated liquid at 900 kPa. The coefficient of performance of this heat pump is

Consider a heat pump that operates on the vapor compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 100 kPa, and exits at 900 kPa and 70°C, and leaves the condenser as saturated liquid at 900 kPa. The coefficient of performance of this heat pump is

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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Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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Consider a refrigrator that operates on the vapor compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 100 kPa, and exits at 1000 kPa and 80°C, and leaves the condenser as saturated liquid at 1000 kPa. The coefficient of performance of this refrigrator is Lütfen birini seçin: a. 1.21 b. 1.87 c. 2.85 d. 1.59 e. 2.34
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2. An ideal refrigeration cycle that has a condenser temperature of 25°C and an evaporator temperature of -25°C. Compute for the work input to the compressor, heat absorbed by the evaporator from the cold space, heat released to the hot space, and the COP of this refrigerator for the working fluid R-410a. Equations: Efficiency of a turbine: W,(actual) H2.actual – H1 W,(isentropic) H2.isentropic - H, Efficiency of a compressor: W,(isentropic) H2isentropic – H1 = W,(actual) H2actual – H1 Rankine cycle efficiency: Wnet_ |Wturbinel - |Wpump| Qboiler COP of a refrigerator: Q¿(heat absorbed from cold space) B Wc(work input to the compressor) Thermodynamic tables: Water Van Ness – Page 681 Sonntag – Page 776 R-134a Sonntag – Page 810
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