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Hot oil is cooled from 80 to 50°C in an oil cooler which uses air as the coolant. The air temperature rises from 30 to 40°C. The designer uses a LMTD value of 26°C. The type of heat exchanger is
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- parallel flow
- double pipe
- counter flow
- cross flow
- parallel flow
Correct Option: D
θ = | ||||
ln | ||||
θ2 |
θ1 = 50° , θ2 = 10°
θ1 = 40° , θ2 = 20°
As given value is between these two, so cross flow is the best option.