A standard ammonia vaporcompression cycle developing 20 tons of refrigeration operates with a condensing temperature of 32°C and an evaporating temperature of 14°C. Calculate the (a) refrigerating effect, (b) circulating rate of refrigerant, (c) theoretical power, (d) COP, (e) gallons per minute of cooling water in the condenser, if ∆t is 8°C, (f) quality of the refrigerant entering the evaporator, and (g) temperature of the refrigerant leaving the compressor. (1 gallon contains 8.33 lb. of water) Answers: (a) 1093.7 kJ/kg, (b) 3.86 kg/min., (c) 15.44 kW, (d) 4.56, (e) 40.6 gpm Show your complete solution.

A standard ammonia vaporcompression cycle developing 20 tons of refrigeration operates with a condensing temperature of 32°C and an evaporating temperature of 14°C. Calculate the (a) refrigerating effect, (b) circulating rate of refrigerant, (c) theoretical power, (d) COP, (e) gallons per minute of cooling water in the condenser, if ∆t is 8°C, (f) quality of the refrigerant entering the evaporator, and (g) temperature of the refrigerant leaving the compressor. (1 gallon contains 8.33 lb. of water) Answers: (a) 1093.7 kJ/kg, (b) 3.86 kg/min., (c) 15.44 kW, (d) 4.56, (e) 40.6 gpm Show your complete solution.

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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