At steady state, work at a rate of 30 kW is done by a paddle wheel on a slurry c

Question

At steady state, work at a rate of 30 kW is done by a paddle wheel on a slurry contained within a closed, rigid tank. Heat transfer from the tank occurs at a temperature of 240 ºC to surroundings that, away from the immediate vicinity of the tank, are at 26 ºC. Determine the rate of entropy production, in kW/K,

(a) for the tank and its contents as the system.

= ? kW/K

(b) for an enlarged system including the tank and enough of the nearby surroundings for the heat transfer to occur at 26 ºC.

= ? kW/K

Explanation / Answer

a. for tank and its contents ...

Calculate therate of entropy production = 30/ ( 273 + 240 ) = 0.058479

b. Calculate the rate of tropy production for enlarged system = 30 / ( 273 + 26) = 0.010

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