Calculate the required water flow rate and the area of the heat exchanger.

Question

The lubricating oil used in a gear box of a compressor is being recirculated through a double pipe heat exchanger for cooling. The oil is to be cooled from 70^oC to 40^oC using water available at 28^oC. Flow rate of the oil is 1000 kg/hr. Water exit temperature should not exceed 42^oC. C_p of oil is 2.05 kJ/kg-K, C_p of water is 4.17 kJ/kg-K. Calculate the required water flow rate and the area of the heat exchanger. Assume counter flow. Also assume the overall heat transfer coefficient to be 300 W/m²K.

                                                            

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The lubricating oil used in a gear box of a compressor is being recirculated through a double pipe heat exchanger for cooling.

Answer 1

The lubricating oil used in a gear box of a compressor is being recirculated through a double pipe heat exchanger for cooling. The oil is to be cooled from 70^oC to 40^oC using water available at 28^oC. Flow rate of the oil is 1000 kg/hr. Water exit temperature should not exceed 42^oC. C_p of oil is 2.05 kJ/kg-K, C_p of water is 4.17 kJ/kg-K. Calculate the required water flow rate and the area of the heat exchanger. Assume counter flow. Also assume the overall heat transfer coefficient to be 300 W/m²K.