18.7 21.4 24.4 30.2 37.9 44.5
Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Jack Erjavec, Rob Thompson
Chapter34: Emission Control Diagnosis And Service
Section: Chapter Questions
Problem 2RQ: What will result from too little EGR flow? And what can cause a reduction in the flow?
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Question
![53.1
64.4
68.6
489
523
atio of 3 (i.e 581
613
659
ge turbine
ir is 10 bar
reases its t
which increa
ssure ratio
18.7
21.4
24.4
30.2
37.9
44.5
= 0.287 kJ/k
683
711
744
773
808
er system as foll
re of the air is 4
K.
> first turbine ha
e back up to 90
pic efficiency of
!) in kW:
12
>erfectly isentropic (i.e. T') in K:](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F02d77666-0e0a-450f-9c05-e8681641ddd6%2Fd5f1380c-2cc6-4634-bb8d-a2bed0dd3831%2F3pkypgs_processed.png&w=3840&q=75)
Transcribed Image Text:53.1
64.4
68.6
489
523
atio of 3 (i.e 581
613
659
ge turbine
ir is 10 bar
reases its t
which increa
ssure ratio
18.7
21.4
24.4
30.2
37.9
44.5
= 0.287 kJ/k
683
711
744
773
808
er system as foll
re of the air is 4
K.
> first turbine ha
e back up to 90
pic efficiency of
!) in kW:
12
>erfectly isentropic (i.e. T') in K:
![Compressed air with a flowrate of 6 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 10 bar and the temperature of the air is 459 K.
• From 1-2 the air passes through a heat exchanger which increases its temperature to 902 K.
• From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/P₂²
p=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 902 K.
• From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 90%.
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. Q) in kW:
12
b. The temperature of the air leaving the first turbine if it were perfectly isentropic (i.e. T¹_ ) in K:
3
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 K:
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 the system in J/kgK:
<](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F02d77666-0e0a-450f-9c05-e8681641ddd6%2Fd5f1380c-2cc6-4634-bb8d-a2bed0dd3831%2Fv2uign_processed.png&w=3840&q=75)
Transcribed Image Text:Compressed air with a flowrate of 6 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 10 bar and the temperature of the air is 459 K.
• From 1-2 the air passes through a heat exchanger which increases its temperature to 902 K.
• From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/P₂²
p=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 902 K.
• From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 90%.
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. Q) in kW:
12
b. The temperature of the air leaving the first turbine if it were perfectly isentropic (i.e. T¹_ ) in K:
3
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 K:
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 the system in J/kgK:
<
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