In a double-pipe, counter-flow heatexchanger, water entering at 1.5 kg/sis heated from 25°C to 70°C as it flowsthru the inner pipe. Hot oil enters theheat exchanger at 2.5 kg/s and 115°C.The convection heat transfercoefficients in the cold- and hot-sidesare 100 and 50 kW/m2.°C,respectively. Calculate the requiredheat transfer area in m2. TakeCp=4.18 kJ/kg.°C for water, and cp = 1.67%3D%3DkJ/kg.°C for oil.

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In a double-pipe, counter-flow heat exchanger, water entering at 1.5 kg/s is heated from 25°C to 70°C as it flows thru the inner pipe. Hot oil enters the

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

In a double-pipe, counter-flow heat
exchanger, water entering at 1.5 kg/s
is heated from 25°C to 70°C as it flows
thru the inner pipe. Hot oil enters the
heat exchanger at 2.5 kg/s and 115°C.
The convection heat transfer
coefficients in the cold- and hot-sides
are 100 and 50 kW/m2.°C,
respectively. Calculate the required
heat transfer area in m2. Take
Cp=
4.18 kJ/kg.°C for water, and cp = 1.67
%3D
%3D
kJ/kg.°C for oil.

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