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식품공학#7

저작시기 2007.05 |등록일 2008.02.26 한글파일한글 (hwp) | 2페이지 | 가격 300원

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식품공학과제입니다.

목차

1. Write simple heat balance equation.
2. Verify ΔH = Q .
3. What is heat content?
4. Plot temperature versus enthalpy in Example 1.
5. A liquid fermentation medium at 30℃ is pumped at a rate of 2000 kg/h through a heater, where it is heated to 70℃ under pressure. The waste heat water used to heat this medium enters at 95℃ and leaves at 85℃. The average heat capacity of the fermentation medium is 4.06 kJ/kgK, and that for water is 4.21 kJ/kgK. The fermentation stream and the wastewater stream are separated by a metal surface through which heat is transferred and do not physically mix with each other. Make a complete heat balance on the system. Calculate the water flow and the amount of heat added to the fermentation medium assuming no heat losses.
6. Calculate the water flow again by applying the simpler balance as below. Energy gain by component 1 = energy loss by component 2

본문내용

2. Verify ΔH = Q .
전체에너지 변화 = 전체 시스템에 가해진 열- 시스템이 바깥에 한일
∆E = Q - W
∆U + ∆E + ∆E = Q - W
W = ∫PdV - ∆E - f
∫PdV + ∆U = Q + f
∆U = Q + f - ∫PdV

d(PV) = PdV + VdP
ΔPV = ∫PdV + ∫VdP
∫PdV = ΔPV - ∫VdP

ΔU +ΔPV = Q + f + ∫VdP
U2 - U1 + P2V2 - P1V1 = Q + f + ∫VdP
(U2 + P2V2) - (U1 + P1V1) = Q + f + ∫VdP
H H (압력변화가 없다)
H2 - H1 = Q + f + ∫VdP
H2 - H1 = Q
∴ ΔH = Q
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