GATE ME 2022 Set 1 — Question 65
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Heat Transfer → Heat Exchangers → Effectiveness-NTU Method
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Question
During open-heart surgery, a patient’s blood is cooled down to from using a concentric tube counter-flow heat exchanger. Water enters the heat exchanger at and leaves at . Blood flow rate during the surgery is .Use the following fluid properties:
Effectiveness of the heat exchanger is _________ (round off to 2 decimal places).
| Fluid | Density (kg/m) | Specific heat (J/kg-K) |
|---|---|---|
| Blood | 1050 | 3740 |
| Water | 1000 | 4200 |
Correct answer
0.4 to 0.44
Solution
1.Calculate heat capacity rate of blood ():
2.Calculate actual heat transfer rate ():
3.Calculate heat capacity rate of water ():
From energy balance, 4.Identify :
5.Calculate maximum possible heat transfer rate ():
6.Calculate effectiveness ():
Rounding to 2 decimal places, .Continue learning with Success Tracker
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