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In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing at the rate of 1000kg/h enters at 15C and leaves at 30C. It is heated by ail (Cp = 2100J/kgK) flowing at the rate of 500kg/h from the inlet temperature of 100C ta 40C. The na. of transfer units is
  • a)
    1.11
  • b)
    1.37
  • c)
    1.89
  • d)
    2.23
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing ...
Given, mc = 1000kg/h, mh = 500kg/h, cc = 4200J/kgK
ch = 2100J/kgK,Tc,i =15C, Tc,0 = 30C,Th,i =100C, Th,0
= 40∘C
Heat capacity rate, CC = mcCC = 42 x 105J/hK, Ch = mhCh
= 10.5 × 105J/hK
Cmin = 10.5 × 105J/hK
Effectiveness of heat exchanger, ϵ = Qact/Qmax =
A ∣ sO, for the counter flow heat exchanger,
Where, NTU = no. of transfer unit,
0.705−0.25×0.705exp⁡[−0.75NTU] =
1−exp⁡[−0.75NTU]
0.82375exp⁡[−0.75NTU] = 0.295
exp⁡[−0.75NTU] = 0.358
NTU = 1.37
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Most Upvoted Answer
In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing ...
Given, mc = 1000kg/h, mh = 500kg/h, cc = 4200J/kgK
ch = 2100J/kgK,Tc,i =15C, Tc,0 = 30C,Th,i =100C, Th,0
= 40∘C
Heat capacity rate, CC = mcCC = 42 x 105J/hK, Ch = mhCh
= 10.5 × 105J/hK
Cmin = 10.5 × 105J/hK
Effectiveness of heat exchanger, ϵ = Qact/Qmax =
A ∣ sO, for the counter flow heat exchanger,
Where, NTU = no. of transfer unit,
0.705−0.25×0.705exp⁡[−0.75NTU] =
1−exp⁡[−0.75NTU]
0.82375exp⁡[−0.75NTU] = 0.295
exp⁡[−0.75NTU] = 0.358
NTU = 1.37
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In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing at the rate of 1000kg/h enters at 15∘C and leaves at 30∘C. It is heated by ail (Cp = 2100J/kgK) flowing at the rate of 500kg/h from the inlet temperature of 100∘C ta 40∘C. The na. of transfer units isa)1.11b)1.37c)1.89d)2.23Correct answer is option 'B'. Can you explain this answer?
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In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing at the rate of 1000kg/h enters at 15∘C and leaves at 30∘C. It is heated by ail (Cp = 2100J/kgK) flowing at the rate of 500kg/h from the inlet temperature of 100∘C ta 40∘C. The na. of transfer units isa)1.11b)1.37c)1.89d)2.23Correct answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing at the rate of 1000kg/h enters at 15∘C and leaves at 30∘C. It is heated by ail (Cp = 2100J/kgK) flowing at the rate of 500kg/h from the inlet temperature of 100∘C ta 40∘C. The na. of transfer units isa)1.11b)1.37c)1.89d)2.23Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a counter flow heat exchanger, the water (Cp = 4200J/kgK) flawing at the rate of 1000kg/h enters at 15∘C and leaves at 30∘C. It is heated by ail (Cp = 2100J/kgK) flowing at the rate of 500kg/h from the inlet temperature of 100∘C ta 40∘C. The na. of transfer units isa)1.11b)1.37c)1.89d)2.23Correct answer is option 'B'. Can you explain this answer?.
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