A counter-flow double pipe heat exchanger is to heat water from 20 ⁰C to 80 ⁰C at a rate of 1.2 kgs-1. The heating is to be accomplished by geothermal water available at 160 ⁰C at a mass flow rate of 2 kgs-1. The inner tube is thin walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient is 640 Wm-2K-1, determine the length of the heat exchanger required to achieve the desired heating. The specific heats of water and geothermal water are 4.18 and 4.31 kJkg-1k-1 respectively. Comment on your answer in terms of its practical application.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Heat transfer in heat exchangers
A counter-flow double pipe heat exchanger is to heat water from 20 ⁰C to 80 ⁰C at a rate of 1.2 kgs-1. The heating is to be accomplished by geothermal water available at 160 ⁰C at a mass flow rate of
2 kgs-1. The inner tube is thin walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient is 640 Wm-2K-1, determine the length of the heat exchanger required to achieve the desired heating. The specific heats of water and geothermal water are 4.18 and 4.31 kJkg-1k-1 respectively.
Comment on your answer in terms of its practical application.
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