Question: 04 [20 marks] In a single pass counter flow heat exchanger, 0.5kg/s of ethylene glycol is to be cooled from 1000 C to 600C by

04 [20 marks] In a single pass counter flow heat exchanger,

0.5kg/s of ethylene glycol is to be cooled from 1000 C to

04 [20 marks] In a single pass counter flow heat exchanger, 0.5kg/s of ethylene glycol is to be cooled from 1000 C to 600C by cooling water that enters the annular space of the heat exchanger at 150 C and has a mass flow rate of 0.33kg/s. Heat exchanger is made up with steel for shell and copper for tube. Inside diameter of copper tube is 12.5mm and outside diameter is 14.5mm and shell inside diameter is 22 mm. Fouling resistances and metal wall resistances are negligible (a) Calculate the overall heat transfer coefficient (5 marks (b) Calculate the length of the tube required (5 marks c) Repeat the calculations if water flows in the same direction as ethylene glycol. [10 marks) Water 1000 Properties of ethylene glycol and water at mean temperature Properties Ethylene glycol Density (kg/m) 1087 Viscosity (N.$/m) 3.2x10 Specific heat (J/kgK) 2650 Thermal conductivity (W/ mK) 0.261 0.853x10 4200 0.614

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