A double-pipe heat exchanger is made up from an interior thick-tube (k = 110 W/m K) withinternal and external diameters of 1.3 cm and 1.5 cm, respectively, and an exterior tube withdiameter of 3 cm. A fouling layer with Re= 0.0004 m2 K/W has formed on the outer surface ofthe interior tube. Assume the length of this heat exchange is 1 m and use the following flow andfluid properties:Inlet umTiToCp[m/s]°C]'C][kg/m³] [W/m?.K] [J/kg.K]Hot fluid(External0.0141258542672118---- ---flow)Cold fluid0.0320601000117174180(Internal flow)Determine the followings:The thermal resistance due to wall conduction.The convection thermal resistance of the internal flow.The convection thermal resistance of the external flow.The thermal resistance due to fouling in K/W.The log-mean temperature difference, ATim.

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A double-pipe heat exchanger is made up from an interior thick-tube (k = 110 W/m K) with internal and external diameters of 1.3 cm and 1.5 cm, respectively, and an exterior tube with diameter of 3 cm. A fouling layer with Ro= 0.0004 m2 K/W has formed on the outer surface of the interior tube. Assume the length of this heat exchange is 1 m and use the following flow and fluid properties: Inlet um Ti To Ср [m/s] [°C] [°C] [kg/m³] (W/m'.K] [J/kg.K] Hot fluid (External flow) Cold fluid 0.014 125 854 267 2118 ----- -- 0.03 20 60 1000 11717 4180 (Internal flow) Determine the followings: The thermal resistance due to wall conduction. The convection thermal resistance of the internal flow. The convection thermal resistance of the external flow. The thermal resistance due to fouling in K/W. The log-mean temperature difference, ATIM-

A double-pipe heat exchanger is made up from an interior thick-tube (k = 110 W/m K) with internal and external diameters of 1.3 cm and 1.5 cm, respectively, and an exterior tube with diameter of 3 cm. A fouling layer with Ro= 0.0004 m2 K/W has formed on the outer surface of the interior tube. Assume the length of this heat exchange is 1 m and use the following flow and fluid properties: Inlet um Ti To Ср [m/s] [°C] [°C] [kg/m³] (W/m'.K] [J/kg.K] Hot fluid (External flow) Cold fluid 0.014 125 854 267 2118 ----- -- 0.03 20 60 1000 11717 4180 (Internal flow) Determine the followings: The thermal resistance due to wall conduction. The convection thermal resistance of the internal flow. The convection thermal resistance of the external flow. The thermal resistance due to fouling in K/W. The log-mean temperature difference, ATIM-

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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

A double-pipe heat exchanger is made up from an interior thick-tube (k = 110 W/m K) with
internal and external diameters of 1.3 cm and 1.5 cm, respectively, and an exterior tube with
diameter of 3 cm. A fouling layer with Re= 0.0004 m2 K/W has formed on the outer surface of
the interior tube. Assume the length of this heat exchange is 1 m and use the following flow and
fluid properties:
Inlet um
Ti
To
Cp
[m/s]
°C]
'C]
[kg/m³] [W/m?.K] [J/kg.K]
Hot fluid
(External
0.014
125
854
267
2118
---- ---
flow)
Cold fluid
0.03
20
60
1000
11717
4180
(Internal flow)
Determine the followings:
The thermal resistance due to wall conduction.
The convection thermal resistance of the internal flow.
The convection thermal resistance of the external flow.
The thermal resistance due to fouling in K/W.
The log-mean temperature difference, ATim.

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