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The compression efficiency is fairly constant at 82%. A compressor in this line has two cylinders, each having a 92 mm bore and a S= 74 mm stroke. The compressor has 4.5% clearance and operates at N = 28 rev/s. The system is being selected for an A/C unit and will operate between an evaporating temperature of 0 °C and a condensing temperature of 35 °C. There is 5 °c of sub-cooling in the condenser, and 10 °C of superheating in the evaporator. a. Sketch and label all state points of the system on a NH3 p-h chart (attach to this cover sheet) b. Compute the refrigerant flow rate (kg/sec) c. Compute the refrigerating capacity (kW) d. Determine the compressor motor size (kW)

The compression efficiency is fairly constant at 82%. A compressor in this line has two cylinders, each having a 92 mm bore and a S= 74 mm stroke. The compressor has 4.5% clearance and operates at N = 28 rev/s. The system is being selected for an A/C unit and will operate between an evaporating temperature of 0 °C and a condensing temperature of 35 °C. There is 5 °c of sub-cooling in the condenser, and 10 °C of superheating in the evaporator. a. Sketch and label all state points of the system on a NH3 p-h chart (attach to this cover sheet) b. Compute the refrigerant flow rate (kg/sec) c. Compute the refrigerating capacity (kW) d. Determine the compressor motor size (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
Problem 1.1MA
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For a line of NH3 compressors, the actual volumetric efficiency is given by : 

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CONDENSER COMP. EVAPORATOR PD =nylinders bore 4 dS*N m =ny actural PDv, Q. = m(h, – h,) W = m(h, – h,) COP = Q, /W
Transcribed Image Text:CONDENSER COMP. EVAPORATOR PD =nylinders bore 4 dS*N m =ny actural PDv, Q. = m(h, – h,) W = m(h, – h,) COP = Q, /W
= 94–6.1 Pa P. (%) actual The compression efficiency is fairly constant at 82%. A compressor in this line has two cylinders, each having a 92 mm bore and a S= 74 mm stroke. The compressor has 4.5% clearance and operates at N = 28 rev/s. The system is being selected for an A/C unit and will operate between an evaporating temperature of 0 °C and a condensing temperature of 35 °C. There is 5 °C of sub-cooling in the condenser, and 10 °C of superheating in the evaporator. a. Sketch and label all state points of the system on a NH3 p-h chart (attach to this cover sheet) b. Compute the refrigerant flow rate (kg/sec) c. Compute the refrigerating capacity (kW) d. Determine the compressor motor size (kW) e. Determine the compressor discharge temperature (C) f. Compute the COP
Transcribed Image Text:= 94–6.1 Pa P. (%) actual The compression efficiency is fairly constant at 82%. A compressor in this line has two cylinders, each having a 92 mm bore and a S= 74 mm stroke. The compressor has 4.5% clearance and operates at N = 28 rev/s. The system is being selected for an A/C unit and will operate between an evaporating temperature of 0 °C and a condensing temperature of 35 °C. There is 5 °C of sub-cooling in the condenser, and 10 °C of superheating in the evaporator. a. Sketch and label all state points of the system on a NH3 p-h chart (attach to this cover sheet) b. Compute the refrigerant flow rate (kg/sec) c. Compute the refrigerating capacity (kW) d. Determine the compressor motor size (kW) e. Determine the compressor discharge temperature (C) f. Compute the COP
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