The lubricating oil for a large industrial gas turbine engine is cooled in a cou

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The lubricating oil for a large industrial gas turbine engine is cooled in a counter flow, concentric tube heat exchanger. The cooling water flows through the inner tube ( diameter = 25 mm) with inlet temperature 25 degree celsius and mass flow rate 0.2 kg/s. The oil flows through the annulus (diameter = 50 mm) with mass flow rate 0.125 kg/s and its temperature at entry and exit are 90 degree Celsius and 60 degree Celsius. Find outlet temperature of cooling water.

The Lubricating Oil For A Large Industrial Gas Turbine Engin...

Options:

A . 14.58 degree celsius

B . 24.58 degree celsius

C . 34.58 degree celsius

D . 44.58 degree celsius

Answer: Option C
Answer: (c).34.58 degree celsius

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