[題目] 熱力學－Entropy

[c22764942 (自由海豚)]

[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)


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