1. The oil (C, = 1759 J/kg •C) from an oil-cooled electric transformer is cooled from 79.4°C to 29.4°C at the rate of 1360.5 kg/h. This is done in an oil-water heat exchanger that receives 2948 kg/h of water (C, = 4186 J/kg •C) at 15.6°C. For the heat exchanger U = 295 W/m? •C. Find the exit temperature of water and heating surface area for (a) parallel flow (b) counterflow.

1. The oil (C, = 1759 J/kg •C) from an oil-cooled electric transformer is cooled from 79.4°C to 29.4°C at the rate of 1360.5 kg/h. This is done in an oil-water heat exchanger that receives 2948 kg/h of water (C, = 4186 J/kg •C) at 15.6°C. For the heat exchanger U = 295 W/m? •C. Find the exit temperature of water and heating surface area for (a) parallel flow (b) counterflow.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

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.

Question

1. The oil (C, = 1759 J/kg •C) from an oil-cooled electric transformer is cooled from 79.4°C to 29.4°C at the rate of
1360.5 kg/h. This is done in an oil-water heat exchanger that receives 2948 kg/h of water (C, = 4186 J/kg •C) at
15.6°C. For the heat exchanger U = 295 W/m? •C. Find the exit temperature of water and heating surface area for
(a) parallel flow (b) counterflow.

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Thermodynamics