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Split_00030 - 8.54(contd T&E T&E d T f 2 = 34 C Ta1 = 506 C...

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8- 30 8.54 (cont’d) d. T T f a 2 34 506 1 = ° = ° C C T&E , T T f a 2 1 36 552 = ° = ° C C T&E e. In an adiabatic system, when a liquid evaporates, the temperature of the remaining condensed phase drops. In this problem, the heat transferred from the air goes to (1) vaporize 90% of the acetone in the feed; (2) raise the temperature of the remaining wet film above what it would be if the process were adiabatic. If the feed air temperature is above about 530 ° C, enough heat is transferred to keep the film above its inlet temperature of 35 ° C; otherwise, the film temperature drops. 8.55 T p set psia F = ° 200 100 b g (Cox chart – Fig. 6.1-4) a. Basis: 3.00 10 SCF 1 lb - mole h 359 SCF lb mole h C H 3 3 8 × = 8 357 . 8.357 lb-mole C 3 H 8 (v)/h 8.357 lb-mole C 3 H 8 (l)/h 200 psia, 100 o F 200 psia, 100 o F ± m (lb - mole H O(l) / h 2 ± m (lb - mole H O(l) / h 2 70 o F 85 o F The outlet water temperature is 85 o F . It must be less than the outlet propane temperature; otherwise, heat would be transferred from the water to the propane near the outlet, causing
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