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Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at
15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?
(B) 32.5
Correct answer is between ','. Can you explain this answer?
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Verified Answer
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (bo...
Given For cold fluid [Water]
View all questions of this test
Mc = 7.5 kg/sec
Cc = 4 kj/kg-K
Tci = 15oC
For hot fluid [Air]
Mh = 10 kg/sec
Ch = 2 kj/kg-K
Thi = 120oC
U = 216.66 W/m2-K
A = 240 m2
For a counter flow heat exchanger,
Where C = Cmin/Cmax & NTU = UA/Cmin
Based on given data
Ch = mhch
= 10 x 2
= 20 kW/K
∴ Ch < />c
∴ Cmin = Ch &
Cmax = Cc
Thus,
C = Ch/Cc = 20/30 = 2/3
&
NTU = UA/Umin
= 216.66 x 240/20000
= 2.599
≃ 2.6
Where
ε = Qact/Qth
⇒ Qact = εQth
Also,
Qact = UAθm
⇒ θm = Qact/UA
⇒θm - εθth/UA = εCh(Thi - Tci)/UA
⇒θm = 0.8 x 20 x 103 x (120-15)/216.66 x 240
⇒θm = 32.3oC
Most Upvoted Answer
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (bo...
Given For cold fluid [Water]
Mc = 7.5 kg/sec
Cc = 4 kj/kg-K
Tci = 15oC
For hot fluid [Air]
Mh = 10 kg/sec
Ch = 2 kj/kg-K
Thi = 120oC
U = 216.66 W/m2-K
A = 240 m2
For a counter flow heat exchanger,
Where C = Cmin/Cmax & NTU = UA/Cmin
Based on given data
Ch = mhch
= 10 x 2
= 20 kW/K
∴ Ch < />c
∴ Cmin = Ch &
Cmax = Cc
Thus,
C = Ch/Cc = 20/30 = 2/3
&
NTU = UA/Umin
= 216.66 x 240/20000
= 2.599
≃ 2.6
Where
ε = Qact/Qth
⇒ Qact = εQth
Also,
Qact = UAθm
⇒ θm = Qact/UA
⇒θm - εθth/UA = εCh(Thi - Tci)/UA
⇒θm = 0.8 x 20 x 103 x (120-15)/216.66 x 240
⇒θm = 32.3oC
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Community Answer
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (bo...
Given For cold fluid [Water]
Mc = 7.5 kg/sec
Cc = 4 kj/kg-K
Tci = 15oC
For hot fluid [Air]
Mh = 10 kg/sec
Ch = 2 kj/kg-K
Thi = 120oC
U = 216.66 W/m2-K
A = 240 m2
For a counter flow heat exchanger,
Where C = Cmin/Cmax & NTU = UA/Cmin
Based on given data
Ch = mhch
= 10 x 2
= 20 kW/K
∴ Ch < />c
∴ Cmin = Ch &
Cmax = Cc
Thus,
C = Ch/Cc = 20/30 = 2/3
&
NTU = UA/Umin
= 216.66 x 240/20000
= 2.599
≃ 2.6
Where
ε = Qact/Qth
⇒ Qact = εQth
Also,
Qact = UAθm
⇒ θm = Qact/UA
⇒θm - εθth/UA = εCh(Thi - Tci)/UA
⇒θm = 0.8 x 20 x 103 x (120-15)/216.66 x 240
⇒θm = 32.3oC
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Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer?
Question Description
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct 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 Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct 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 Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer?.
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct 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 Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct 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 Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer?.
Solutions for Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
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Here you can find the meaning of Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer?, a detailed solution for Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer? has been provided alongside types of Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Water (sp. heat = 4kj/kg -K) enters a counter flow heat exchanger (both fluids unmixed) at15oC and flows at the rate of 7.5 kg/s . It cools air (cp = 2kj/kg-K) flowing at the rate of 10 kg/s from an inlet temperature of 120oC. For an overall heat transfer coefficient 216.66 W/m2-K. and an exchanger surface area of 240 m2, determine the LMTD for the heat exchanger?(B) 32.5Correct answer is between ','. Can you explain this answer? tests, examples and also practice Chemical Engineering tests.
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