GATE CH · 2023 · CH
Question 55: Heat Transfer
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Question 55
CHNAT2 marksNeeds review
A perfectly insulated, concentric tube countercurrent heat exchanger is used to cool lubricating oil using water as a coolant (see figure below). Oil enters the outer annulus at a mass flow rate of 2 kg·s
with a temperature of 100 °C and leaves at 40 °C. Water enters the inner tube at a mass flow rate of 1 kg·s
with a temperature of 20 °C and leaves at 80 °C. Use specific heats of oil and water as 2089 J·kg
·K
and 4178 J·kg
·K
, respectively. There is no phase change in both the streams. Under steady-state conditions, the number of transfer units (NTU) is ______ (in integer). 
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2023CH
GATE CH 2023 · Paper 1
Chemical Engineering · Original paper archive
- Section
- Chemical Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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