[理工] 熱力學－Entropy
※ [本文轉錄自 Physics 看板 #1GRbpCM0 ]
作者: c22764942 (自由海豚) 看板: Physics
標題: [題目] 熱力學－Entropy
時間: Fri Oct 5 12:06:33 2012
[領域] 熱力學－Entropy (題目相關領域)
[來源] 參考書，作者：郝德助 (課本習題、考古題、參考書...)
[題目] Superheated steam enters one section of an open feed-water
heater at 3 bars and 200℃. Compressed liquid water at the same pressure
and 40℃ enters another inlet.
The mixture of these two streams leaves at the same pressure as a
saturated liquid. If the heater is adiabatic, calculate the change in
entropy for the process per kilogram of mixture leaving the heater.
[瓶頸] 1.想請問如果查不到相對應的compressed liquid熱力性質表，
是否可以使用飽和液體的熱力性質取代？
2.請問ΔS=m3s3-m1s1-m2s2，為什麼leaves liquid的s為正？
而enters liquid的s為負？
(寫寫自己的想法，方便大家為你解答)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.134.145.249
推
10/05 13:08, , 1F
10/05 13:08, 1F
→
10/05 13:09, , 2F
10/05 13:09, 2F
※ 發信站: 批踢踢實業坊(ptt.cc)
※ 轉錄者: c22764942 (220.134.145.249), 時間: 10/11/2012 20:53:29