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

32
45
50
37

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Heat Transfer
In a shell and tube heat exchanger,

The relationship is not generalised
The temperature drop is inversely proportional to the resistance across which the drop occurs
The temperature drops in the two fluids and the wall are proportional to individual resistances
There is no relationship between temperature drop and resistance

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