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EXAMPLE 4.29 Suppose a 100 ton cooling capacity ammonia refrigeration plant is working at evaporating temperature -20°C and condensing temperature 34°C. The liquid is subcooled to 28°C in order to reduce the formation of flash gases. Ammonia vapour leaves the evaporator and enters the compressor at -6°C. There is a pressure loss of 0.1 bar at the suction valve and 0.5 bar at the discharge valves. Assume isentropic compression and take the volumetric efficiency of the compressor to be 80%. Determine the following quantities: (a) Refrigerating effect per kg (b) Mass flow rate in kg/min (c) Piston displacement in m/min (d) COP of the plant (e) Power required (kW)

EXAMPLE 4.29 Suppose a 100 ton cooling capacity ammonia refrigeration plant is working at evaporating temperature -20°C and condensing temperature 34°C. The liquid is subcooled to 28°C in order to reduce the formation of flash gases. Ammonia vapour leaves the evaporator and enters the compressor at -6°C. There is a pressure loss of 0.1 bar at the suction valve and 0.5 bar at the discharge valves. Assume isentropic compression and take the volumetric efficiency of the compressor to be 80%. Determine the following quantities: (a) Refrigerating effect per kg (b) Mass flow rate in kg/min (c) Piston displacement in m/min (d) COP of the plant (e) Power required (kW)

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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EXAMPLE 4.29 Suppose a 100 ton cooling capacity ammonia refrigeration plant is working at evaporating temperature -20°C and condensing temperature 34°C. The liquid is subcooled to 28°C in order to reduce the formation of flash gases. Ammonia vapour leaves the evaporator and enters the compressor at -6°C. There is a pressure loss of 0.1 bar at the suction valve and 0.5 bar at the discharge valves. Assume isentropic compression and take the volumetric efficiency of the compressor to be 80%. Determine the following quantities: (a) Refrigerating effect per kg (b) Mass flow rate in kg/min (c) Piston displacement in m/min (d) COP of the plant (e) Power required (kW)
Transcribed Image Text:EXAMPLE 4.29 Suppose a 100 ton cooling capacity ammonia refrigeration plant is working at evaporating temperature -20°C and condensing temperature 34°C. The liquid is subcooled to 28°C in order to reduce the formation of flash gases. Ammonia vapour leaves the evaporator and enters the compressor at -6°C. There is a pressure loss of 0.1 bar at the suction valve and 0.5 bar at the discharge valves. Assume isentropic compression and take the volumetric efficiency of the compressor to be 80%. Determine the following quantities: (a) Refrigerating effect per kg (b) Mass flow rate in kg/min (c) Piston displacement in m/min (d) COP of the plant (e) Power required (kW)
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