Sep 19, 2017

THE INITIAL TEMPERATURE OF A COMPLETELY COVERED AND INSULATED HOT WATER CUP CONTAINING 1 KG OF…

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The initial temperature of a completely covered and insulated hot water cup containing 1 kg of water is 350 K. The ambient air (cv0,A = 0.713 kJ kg–1 K–1) is contained in a rigid and insulated room at a temperature of 290 K. The air mass is 0.4 kg. If the insulation is removed, but the covering retained (to allow heat transfer but no mass transfer) from the water, and the cup is cooled gradu

a. The heat removed from the water for each 0.5 K drop in the water temperature

b. The temperature of air TA when the water cools to 349.5 K

c. The entropy of the water (SW) at TW = 350 and 349.5 K

d. The entropy of the air (SA) when TW = 350 and 349.5 K

e. The total entropy S (U, V, m) = SA + SW when TW = 350 and 349.5 K

f. Repeat these steps for TW = 349, 348.5, … and so on, and plot the entropy with respect to TA and UA.


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