Question

A metal block of weight 50 kg heated to a uniform temperature of 227 degree C...

A metal block of weight 50 kg heated to a uniform temperature of 227 degree C is thrown into a large lake at 12 degree C. a) Determine the entropy change of the block, b) the entropy change of the lake water and c) the entropy generated during this process. Take c_p(metal) = 0.45kJ/kg.K. (Answers in two decimal points).

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Answer #1

Given data:

Mass of metal block = 50 kg

Temperature of Metal block = 227 ° C = 500 K

Temperature of water in large lake = 12 ° C = 285 K

Now,

Change in entopy of block is given by

(b) Entropy change in lake water =

From conservation of energy principle

Heat lost by metal = heat gained by lake water

therefore Entropy change in lake water

(C) Entropy Genrated =

from entropy principle

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