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Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₁=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: a. The heat transfer to the air in the first heat exchanger (i.e. Q₁2) in kW: 18.7 b. The temperature of the air leaving the first turbine if it were perfectly ise c. The actual temperature of the air leaving the first turbine (i.e. T)in K: 21.4 d. The actual temperature of the air leaving the second turbine (i.e. T) in 30.2 24.4 37.9 e. The magnitude of the net rate of work transfer from the system in kW: f. The change in specific entropy of the air between the start and end of t 48.3 53.1 68.6 75.4 489 523 K:

Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₁=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: a. The heat transfer to the air in the first heat exchanger (i.e. Q₁2) in kW: 18.7 b. The temperature of the air leaving the first turbine if it were perfectly ise c. The actual temperature of the air leaving the first turbine (i.e. T)in K: 21.4 d. The actual temperature of the air leaving the second turbine (i.e. T) in 30.2 24.4 37.9 e. The magnitude of the net rate of work transfer from the system in kW: f. The change in specific entropy of the air between the start and end of t 48.3 53.1 68.6 75.4 489 523 K:

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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... Moving to another question will save this response. Question 7 Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. • From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₂=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: ₂) a. The heat transfer to the air in the first heat exchanger (i.e. ₁) i in kW: b. The temperature of the air leaving the first turbine if it were perfectly ise c. The actual temperature of the air leaving the first turbine (i.e. T) in K: d. The actual temperature of the air leaving the second turbine (i.e. T) in 24.4 30.2 37.9 48.3 e. The magnitude of the net rate of work transfer from the system in kW: f. The change in specific entropy of the air between the start and end of t 53.1 68.6 75.4 489 A Moving to another question will save this response. 18.7 21.4 523 581 628 673 696 723 761 798 808 K:
Transcribed Image Text:... Moving to another question will save this response. Question 7 Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. • From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₂=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: ₂) a. The heat transfer to the air in the first heat exchanger (i.e. ₁) i in kW: b. The temperature of the air leaving the first turbine if it were perfectly ise c. The actual temperature of the air leaving the first turbine (i.e. T) in K: d. The actual temperature of the air leaving the second turbine (i.e. T) in 24.4 30.2 37.9 48.3 e. The magnitude of the net rate of work transfer from the system in kW: f. The change in specific entropy of the air between the start and end of t 53.1 68.6 75.4 489 A Moving to another question will save this response. 18.7 21.4 523 581 628 673 696 723 761 798 808 K:
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