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Heat Transfer

Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

< 1
> 1
Between 1 & 2
1

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

45
37
32
50

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Heat Transfer
Sensible heat of hot industrial flue gases can not be recovered by a/an

Economiser
Regenerator
Ceramic recuperator
None of these

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

9000
4000
4600
3000

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

K/Ax
KA/x
A/Kx
X/KA

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Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Infinity
Same as average heat transfer co-efficient for tube side
Zero
None of these

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