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In a solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60m2 with overall heat transfer coefficient of 25 W/m2 - K is used for this purpose. Assuming for air is 1kJ/kg K. The effectiveness of the heat exchanger is
- a)0.
- b)0.6
- c)1.6
- d)25
Correct answer is option 'B'. Can you explain this answer?
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In a solar assisted air conditioning system, 1 kg/sec of ambient air ...
This is the case of a balanced counter flow heat exchanger.
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∴ ε = NTU/1+NTU
Where NTU = UA/(mcp)min
For balanced heat exchanger,
(mcp)h = (mcp)c
∴ NTU = 60 x 25 / 1000 = 1.5
∴ ε = 1.5/1+1.5 = 0.6
Most Upvoted Answer
In a solar assisted air conditioning system, 1 kg/sec of ambient air ...
Calculation of Effectiveness of Heat Exchanger:
- Given data:
- Mass flow rate of air (m) = 1 kg/s
- Heat transfer area (A) = 60 m2
- Overall heat transfer coefficient (U) = 25 W/m2-K
- Specific heat of air (Cp) = 1 kJ/kg-K
- The formula for effectiveness of a counter-flow heat exchanger is given by:
ε = (1 - e^(-NTU(1 - Cmin))) / (1 + Cmin)
- Calculate NTU:
NTU = U * A / m * Cp
- Calculate Cmin:
Cmin = min(C1, C2)
where C1 = m * Cp = 1 kJ/s-K
- Substitute the values in the formula:
NTU = (25 * 60) / (1 * 1) = 150
Cmin = 1
ε = (1 - e^(-150(1 - 1))) / (1 + 1) = (1 - e^0) / 2 = (1 - 1) / 2 = 0
Therefore, the effectiveness of the heat exchanger is 0. This indicates that the heat exchanger is not able to transfer all the available heat between the two air streams.
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In a solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60m2 with overall heat transfer coefficient of 25 W/m2 - K is used for this purpose. Assuming for air is 1kJ/kg K. The effectiveness of the heat exchanger isa) 0.b) 0.6c) 1.6d) 25Correct answer is option 'B'. Can you explain this answer?
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In a solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60m2 with overall heat transfer coefficient of 25 W/m2 - K is used for this purpose. Assuming for air is 1kJ/kg K. The effectiveness of the heat exchanger isa) 0.b) 0.6c) 1.6d) 25Correct answer is option 'B'. 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 In a solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60m2 with overall heat transfer coefficient of 25 W/m2 - K is used for this purpose. Assuming for air is 1kJ/kg K. The effectiveness of the heat exchanger isa) 0.b) 0.6c) 1.6d) 25Correct answer is option 'B'. 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 In a solar assisted air conditioning system, 1 kg/sec of ambient air is to be preheated by the same amount of air leaving the system. A counter-flow heat exchanger having an area of 60m2 with overall heat transfer coefficient of 25 W/m2 - K is used for this purpose. Assuming for air is 1kJ/kg K. The effectiveness of the heat exchanger isa) 0.b) 0.6c) 1.6d) 25Correct answer is option 'B'. Can you explain this answer?.
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