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Нeat 4 Exchanger water 3 Figure 2 What is the specific isentropic work done of compressor in kJ/kg? О a. 8.5 O b. 180.2 OC. 151.1 O d. 147.8

Нeat 4 Exchanger water 3 Figure 2 What is the specific isentropic work done of compressor in kJ/kg? О a. 8.5 O b. 180.2 OC. 151.1 O d. 147.8

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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5 Нeat 4 Exchanger water 3 Figure 2 What is the specific isentropic work done of compressor in kJ/kg? а. 8.5 b. 180.2 c. 151.1 O d. 147.8
Transcribed Image Text:5 Нeat 4 Exchanger water 3 Figure 2 What is the specific isentropic work done of compressor in kJ/kg? а. 8.5 b. 180.2 c. 151.1 O d. 147.8
Air enters an adiabatic air compressor with a pressure at 100 kPa, temperature of 30°C, and a steady volume flow rate of 3.0 m3/s. After compression, the temperature of the air is 180°C. The compressed air is then cooled in a heat exchanger, with liquid water as the cooling medium (not mixed with the air). The pressure of the air at the exit of the heat exchanger is 360 kPa. The water, flowing at a steady rate of 1.5 kg/s is heated from 30°C (Point 4) to 38°C (Point 5) in the heat exchanger. Figure 2 shows a schematic of the process. The following can be assumed: a. Air is an ideal gas with cp=1.007 kJ/kgK and R=0.287 kJ/kgK b. Liquid water is incompressible and has a specific heat of 4.18 kJ/kgK c. The pressure drop and the heat loss from the connecting pipes are negligible. d. The pressure drop in the heat exchanger is 40 kPa (i.e. NOT NEGLIGIBLE), and heat loss from the heat exchanger to the surrounding are negligible а. Air 1 Compressor 5
Transcribed Image Text:Air enters an adiabatic air compressor with a pressure at 100 kPa, temperature of 30°C, and a steady volume flow rate of 3.0 m3/s. After compression, the temperature of the air is 180°C. The compressed air is then cooled in a heat exchanger, with liquid water as the cooling medium (not mixed with the air). The pressure of the air at the exit of the heat exchanger is 360 kPa. The water, flowing at a steady rate of 1.5 kg/s is heated from 30°C (Point 4) to 38°C (Point 5) in the heat exchanger. Figure 2 shows a schematic of the process. The following can be assumed: a. Air is an ideal gas with cp=1.007 kJ/kgK and R=0.287 kJ/kgK b. Liquid water is incompressible and has a specific heat of 4.18 kJ/kgK c. The pressure drop and the heat loss from the connecting pipes are negligible. d. The pressure drop in the heat exchanger is 40 kPa (i.e. NOT NEGLIGIBLE), and heat loss from the heat exchanger to the surrounding are negligible а. Air 1 Compressor 5
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