Engineering

Chemical EngineeringQ&A LibraryCooling Oil by Water in an Exchanger. Oil flowing at the rate of 5.04 kg/s (cpm2.09 kJ/kg K) is cooled in a 1-2 heat exchanger from 366.5 K to 344.3 K by 2.02 kg/sof water entering at 283.2 K.The overall heat-transfer coefficient U, is 340 W/m2. K.Calculate the area required. (Hint: A heat balance must first be made to determinethe outlet water temperature.)Question

Asked Sep 22, 2019

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Step 1

Heat exchanger is a mechanical device which is used to transfer heat between two fluids. One fluid is heated or cooled with the help of another fluid. Given heat exchanger is 1-2(one shell and two tubes) heat exchanger. These numbers show number of shells and number of tubes respectively.

Step 2

Applying energy balance on heat exchanger to find out outlet temperature of water

Amount of heat lose by hot fluid = amount of heat gained by cold fluid

Where T_{H1 = }Inlet temperature of hot (oil) fluid

T_{H2} =Outlet temperature of hot (oil) fluid

T_{C1} = Inlet temperature of cold (water) fluid

T_{C2}= Outlet temperature of cold (water) fluid

m∙_{oil} = mass flow rate of oil

m∙_{water} = mass flow rate of water

C_{p}(oil) =specific heat of oil

C_{p}(water) =specific heat of water

= 4.186 kJ/kg ∙ K

Step 3

Plugging the ...

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