Chemical Engineering Exam > Chemical Engineering Questions > A counter flow shell and tube type heat exch...
Start Learning for Free
A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.
(B) 0.63
Correct answer is between ','. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A counter flow shell and tube type heat exchanger is used to heat wat...
Hot fluid [Exhaust gases]
View all questions of this test
CH = mHcH
∴ CH = 1000 x 5 = 5000 Watt/ ...①
Cold fluid [Water]
Cc = mccc
∴ Cc = 4180 x = 8360 Watt/K ...②
From ① & ②
CH < />c
∴ Cmin = CH = 5000 Watt/K
By definition,
C = Cmin/Cmax,
C = C CH/CC
C = 5000/8360
= 0.598
& NTU = UA/min
∴ NTU = 32 x 200/ 5000
= 1.28
For counterflow heat exchanger
∴ ε = 0.626
Most Upvoted Answer
A counter flow shell and tube type heat exchanger is used to heat wat...
Given information:
- Counter flow shell and tube type heat exchanger
- Hot exhaust gases used to heat water
- Water flows at the rate of 2 kg/s
- Exhaust gases flow at the rate of 5 kg/s
- Specific heat of water (c) = 4180 j/kg-K
- Specific heat of exhaust gases (c) = 1000 j/kg-K
- Heat transfer surface area = 32 m2
- Overall heat transfer coefficient = 200 W/m2-K
Calculating the effectiveness of the heat exchanger:
1. Calculate the mass flow rate ratio (R):
R = (m1/m2) = (mass flow rate of hot fluid)/(mass flow rate of cold fluid)
R = (5 kg/s) / (2 kg/s)
R = 2.5
2. Calculate the NTU value:
NTU = (U x A) / (minimum specific heat capacity)
- U = overall heat transfer coefficient = 200 W/m2-K
- A = heat transfer surface area = 32 m2
- Minimum specific heat capacity = minimum of c1 and c2
- c1 = specific heat of hot fluid (exhaust gases) = 1000 j/kg-K
- c2 = specific heat of cold fluid (water) = 4180 j/kg-K
Minimum specific heat capacity = 1000 j/kg-K
NTU = (200 W/m2-K x 32 m2) / (1000 j/kg-K)
NTU = 6.4
3. Calculate the effectiveness (ε) using the NTU method:
ε = (1 - e^(-NTU x (1-R))) / (1 - R x e^(-NTU x (1-R)))
ε = (1 - e^(-6.4 x (1-2.5))) / (1 - 2.5 x e^(-6.4 x (1-2.5)))
ε = 0.63
Therefore, the effectiveness of the heat exchanger is 0.63.
- Counter flow shell and tube type heat exchanger
- Hot exhaust gases used to heat water
- Water flows at the rate of 2 kg/s
- Exhaust gases flow at the rate of 5 kg/s
- Specific heat of water (c) = 4180 j/kg-K
- Specific heat of exhaust gases (c) = 1000 j/kg-K
- Heat transfer surface area = 32 m2
- Overall heat transfer coefficient = 200 W/m2-K
Calculating the effectiveness of the heat exchanger:
1. Calculate the mass flow rate ratio (R):
R = (m1/m2) = (mass flow rate of hot fluid)/(mass flow rate of cold fluid)
R = (5 kg/s) / (2 kg/s)
R = 2.5
2. Calculate the NTU value:
NTU = (U x A) / (minimum specific heat capacity)
- U = overall heat transfer coefficient = 200 W/m2-K
- A = heat transfer surface area = 32 m2
- Minimum specific heat capacity = minimum of c1 and c2
- c1 = specific heat of hot fluid (exhaust gases) = 1000 j/kg-K
- c2 = specific heat of cold fluid (water) = 4180 j/kg-K
Minimum specific heat capacity = 1000 j/kg-K
NTU = (200 W/m2-K x 32 m2) / (1000 j/kg-K)
NTU = 6.4
3. Calculate the effectiveness (ε) using the NTU method:
ε = (1 - e^(-NTU x (1-R))) / (1 - R x e^(-NTU x (1-R)))
ε = (1 - e^(-6.4 x (1-2.5))) / (1 - 2.5 x e^(-6.4 x (1-2.5)))
ε = 0.63
Therefore, the effectiveness of the heat exchanger is 0.63.
|
Explore Courses for Chemical Engineering exam
|
|
A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer?
Question Description
A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer?.
A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer?.
Solutions for A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
Download more important topics, notes, lectures and mock test series for Chemical Engineering Exam by signing up for free.
Here you can find the meaning of A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer?, a detailed solution for A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? has been provided alongside types of A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A counter flow shell and tube type heat exchanger is used to heat water with hot exhaust gases. The water (c = 4180 j/kg-K ) flows at the rate of 2 kg/s and the exhaust gases (c = 1000 j/kg - K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m2 and the overall heat transfer coefficient is 200 W/m2 -K , the effectiveness of the heat exchanger is __________.(B) 0.63Correct answer is between ','. Can you explain this answer? tests, examples and also practice Chemical Engineering tests.
|
|
Explore Courses for Chemical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup