b) Hot exhaust gas of a car engine is to be used to heat up water in a heat exchanger. The exhaust gas enters the heat exchanger at 450°C and 0.871 kg/m² density with the rate of 35 m/min. The water flows into the heat exchanger at 2 MPa and 25°C and leaves as saturated vapour at the same pressure. It is estimated that 10% of the heat given up by the exhaust gas is lost to the surrounding. If the mass flow rate of the exhaust gas is 10 times that of the water, determine i. the mass flow rate of the exhaust gas, (kg/s) ii. the exit temperature of the water, (°C) iii. the rate of heat transfer to the water, (kW) and iv. the exit temperature of the exhaust gas, (°C) Assume exhaust gas as ideal gas with R = 0.287 kJ/kg.K and C, = 1.063 kJ/kg.K

b) Hot exhaust gas of a car engine is to be used to heat up water in a heat exchanger. The exhaust gas enters the heat exchanger at 450°C and 0.871 kg/m² density with the rate of 35 m/min. The water flows into the heat exchanger at 2 MPa and 25°C and leaves as saturated vapour at the same pressure. It is estimated that 10% of the heat given up by the exhaust gas is lost to the surrounding. If the mass flow rate of the exhaust gas is 10 times that of the water, determine i. the mass flow rate of the exhaust gas, (kg/s) ii. the exit temperature of the water, (°C) iii. the rate of heat transfer to the water, (kW) and iv. the exit temperature of the exhaust gas, (°C) Assume exhaust gas as ideal gas with R = 0.287 kJ/kg.K and C, = 1.063 kJ/kg.K

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

b) Hot exhaust gas of a car engine is to be used to heat up water in a heat exchanger. The exhaust gas
enters the heat exchanger at 450°C and 0.871 kg/m² density with the rate of 35 m’/min. The water
flows into the heat exchanger at 2 MPa and 25°C and leaves as saturated vapour at the same
pressure. It is estimated that 10% of the heat given up by the exhaust gas is lost to the surrounding.
If the mass flow rate of the exhaust gas is 10 times that of the water, determine
i. the mass flow rate of the exhaust gas, (kg/s)
ii. the exit temperature of the water, (°C)
ii.
the rate of heat transfer to the water, (kW) and
the exit temperature of the exhaust gas, (°C)
iv.
Assume exhaust gas as ideal gas with R = 0.287 kJ/kg.K and C, = 1.063 kJ/kg.K
Hot Fluid
ishaust Gas)
Cold Fhid
(Wate)
Figure Q2: Heat exchanger

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