Çѹø ¿Ã¸°ÀûÀÌ ÀÖ¾ú´Âµ¥ ÇØ°áÀÌ µÇÁö ¾Ê¾Æ Àç°Ô½Ã ÇÕ´Ï´Ù.
÷ºÎÀÇ ÆÄÀÏÀ» º¸½Ã¸é
Stream A (C1 100%)
- Mass Flow : 10 kg/h
- Density : 45.54 kg/cm3
- Temperature : 1000 K
- Pressure : 250 barg
- Mass Enthalpy : -2272 kJ/kg
ÀÌ stream¿¡ Q (2716 kJ/h)¸¦ °¡Çؼ ´ÙÀ½ÀÇ Stream B ¸¦ ¸¸µé¾ú½À´Ï´Ù.
(ÀϺη¯ Density¸¦ µ¿ÀÏÇÏ°Ô ¸¸µé¾î¼ Volume (V)¸¦ ÀÏÁ¤ÇÏ°Ô ¸¸µé¾ú½À´Ï´Ù)
Stream B (C1 100%)
- Mass Flow : 10 kg/h
- Density : 45.54 kg/cm3
- Temperature : 189.87 K
- Pressure : 30.0 barg
- Mass Enthalpy : -4988 kJ/kg
¿£Å»ÇÇ Â÷ÀÌ°¡ Á¤È®È÷ Q°ª°ú °°ÀÌ ³ª¿É´Ï´Ù. (-4988*10 + 2272*10 = 27160)
dQ = dH ¶ó´Â ¾ê±âÁÒ.
[½ÇÁ¦·Î Hysys¸¦ µ¹·Á¼ (Peng Robinson) ³ª¿Â °á°úÀÔ´Ï´Ù ]
±Ùµ¥, ¿¿ªÇÐ 1¹ýÄ¢¿¡ ÀÇÇϸé, ºÎÇÇ°¡ µ¿ÀÏÇϸé
dU=dQ-PdV=dQ, Áï dU = dQ ¶ó´Â °ÅÁö...À§ÀÇ °á°ú¿Í »ó¹ÝµË´Ï´Ù.
H=U+PV, dH=dU+PdV+VdP=dU+VdP, dH = dU + VdP À̴ϱî dH=dUµµ ¼º¸³ÀÌ ¾ÈµË´Ï´Ù.
¾îÂî µÈ ÀÏÀϱî¿ä?
ÀÌ ¹®Á¦¸¦ ¿¿ªÇÐ 1¹ýÄ¢ÀÇ °æ¿ì¿Í ´Ù¸¥ Flowing system, ¶Ç´Â Open SystemÀ¸·Î »ý°¢ÇÒ ¼öµµ ÀÖÁö¸¸,
¿¿ªÇÐÃ¥ (Smith 3rd Edition Para. 7.1) Conservation of Energy ±Û¸Ó¸®¿¡ ´ÙÀ½°ú °°Àº ³»¿ëÀÌ ³ª¿É´Ï´Ù.
In Chap.2 the first law of thermodynamics was applied to closed systems (nonflow process) and to single-stream, steady-state flow processes to provide specific equations of energy conservation for these important applications. Our purpose here is to present a more general equation applicable to an open system or to a control volume.
Áï, "single-stream, steady-state flow process"±îÁö´Â ¿¿ªÇÐ 1¹ýÄ¢À» ¾²°í, ´Ù¼ººÐÀÌ°í Steady°¡ ¾Æ´Ñ°æ¿ì¸¦ Æ÷ÇÔÇÑ generalized ½ÄÀ» ±¸Çغ¸°Ú´Ù ¶ó´Â °ÍÀÔ´Ï´Ù.