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  ÃÑ°ýÀü¿­°è¼ö ¹× Àü¿­¸éÀû °è»ê ¹®ÀÇ
  ±Û¾´ÀÌ : ¸ö»ç¸®ÀÚ   °íÀ¯ID : rnvheor1     ³¯Â¥ : 19-09-16 10:42     Á¶È¸ : 5091    
¾Æ·¡ µ¥ÀÌÅÍ·Î ÃÑ°ýÀü¿­°è¼ö °è»êÀÌ °¡´ÉÇÑÁö °è»ê ¹æ¹ý Á» ¾Ë·Á ÁÖ¼¼¿ä
1) ¿­·® :
2) ´ë¼öÆò±Õ¿ÂµµÂ÷ :
3) ÃÑ°ýÀü¿­°è¼ö :
4) Àü¿­¸éÀû :
¾Ð·Â¿ë±â°¡ ¾Æ´Ñ ´ë±â¿Í ¿­Àü´ÞµÇ´Â ¹æ½ÄÀÔ´Ï´Ù.
Tube Side : Gas (OD.219.1, 8.2t, 23M)
Shell Side  : Air
1.Properies
¡¡UnitInletOutlet
TemperaturedegC377168
Pressurekg/cm2g0.5
Flowratekg/hr6027
Phase-GasGas
Mol. Weight-21.52
Specific heatkcal/kg-C0.3390.329
Densitykg/m30.5970.880
Thermal ConductivityKcal/m-hr-C0.0680.051
ViscositycP0.0290.021
2. Fouling Factor
Tube inside0.0002hr-m2-degC/kcal
Air side0.0004hr-m2-degC/kcal
3. ´ë±â Á¶°Ç (as per PS-U-101_REV.B_JOB SPECIFICATION FOR PROJECT DESIGN BASIS)
Air temperature
: wet bulb temp 28degC
  (Velocity : 4 m/s)

½ºÅ×Æijë Stefano   19-09-17 20:19
(1) ÃÑ°ýÀü¿­°è¼ö´Â ÃÑ°ý¿­Àü´ÞÀúÇ×ÀÇ ¿ª¼öÀÌ°í ÃÑ°ý¿­Àü´Þ ÀúÇ×Àº °¢ °³º°¿­Àü´ÞÀúÇ×°ªÀÇ ÇÕÀÌ µÇ¹Ç·Î °¢ °³º°¿­Àü´ÞÀúÇ×À» °¢°¢ °è»êÇÏ¿© ÀüüÀúÇ×°ªÀ» ±¸ÇÑ ´ÙÀ½ ÀÌÀÇ ¿ª¼ö¸¦ °è»êÇϸé ÃÑ°ýÀü¿­°è¼ö°¡ °è»êµË´Ï´Ù.  ¿­Àü´Þ Ç¥¸é¿¡¼­ À̹°Áú¿¡ ÀÇÇÑ ÀúÇ×ÀÌ ÀÖ´Ù¸é ÀÌµé °ªµµ ´õÇؼ­ Àüü¿­ÀúÇ×À» °è»êÇÕ´Ï´Ù. 

1) °ø±âÃø ¿ÜºÎ ´ë·ù¿­Àü´Þ ÀúÇ× = 1/ho                        ho = °ø±âÃø ´ë·ù¿­Àü´Þ°è¼ö;  ÷ÀÚ "o" = "outside"
2) °ø±âÃø Fouling¿¡ ÀÇÇÑ ¿­Àü´ÞÀúÇ× =  hod = 0.004    ÷ÀÚ "od" = outside dirt (factor)             
3) °ü ±Ý¼ÓÀÇ ¿­Àü´ÞÀúÇ× = t/k                                    t = thickness of tube,  k = thermal conductivity of tube material
4) °ü³»ºÎÃø Fouling¿¡ ÀÇÇÑ ¿­Àü´ÞÀúÇ× = hid = 0.0002  ÷ÀÚ "id"=  inside dirt (factor)
5) °ü³»ºÎÃø ´ë·ù¿­Àü´ÞÀúÇ× = 1/hi                              hi = Gas Ãø ´ë·ù¿­Àü´Þ°è¼ö;  ÷ÀÚ "i"= "inside"

ÃÑ°ýÀü¿­°è¼ö = U  =  (1/ho +1/hod + t/k + 1/hid + 1/hi) ^(-1)...................................(1)

(2) À§ÀÇ (1)½Ä¿¡¼­ U¸¦ ±¸ÇÏ·Á¸é ho¿Í hi¸¦ °è»êÇØ¾ß ÇÕ´Ï´Ù.  ³ª¸ÓÁö °³º°ÀúÇ×Àº ÁÖ¾îÁø ÀÚ·á¿¡¼­ ±¸ÇÒ ¼ö ÀÖ½À´Ï´Ù.

hoÀÇ °è»ê:
ÀÌ´Â °ü ¿Üº®ÀÇ ¿Âµµ¿Í °ø±â°£ÀÇ ¿ÂµµÂ÷. °üÀÇ ¼³Ä¡¹æÇâ, dz¼ÓÀ¸·ÎºÎÅÍ ÃßÁ¤ÇÏ´Â ¼ö½ÄÀÌ ÀÖ½À´Ï´Ù.  À̸¦ Âü°íÇÏ¸é µË´Ï´Ù.

ho =  ¥á * (¥Ät)^¥â  .......................................................................(2)  ¥á, ¥â = °üÀÇ ¼³Ä¡¹æÇâ, dz¼Ó µî¿¡ µû¶ó Á¤ÇØÁö´Â »ó¼ö


hiÀÇ °è»ê:
ÀÌ´Â °ü°æ, Reynolds No. Prandtle No, °ü°æ, °¡½º¿­Àüµµµµ·ÎºÎÅÍ ÃßÁ¤ÇÏ´Â ¼ö½ÄÀÌ ÀÖ½À´Ï´Ù.  ¿­±³È¯°ü·Ã ¼­Àû¿¡¼­ ½±°Ô ±¸ÇÒ ¼ö ÀÖ´Â ¼ö½ÄÀÔ´Ï´Ù.

Nussel No = (hi*D)/k =  C * (Re)^¥á * (Pr)^¥â  ...............................(3)  C, ¥á, ¥â = »ó¼ö

(3) À§ÀÇ (2), (3)½Ä¿¡¼­ »ó¼ö°ªµéÀº ¿­Àü´Þ¼­Àû¿¡¼­ ã¾Æº¼ ¼ö ÀÖ½À´Ï´Ù.
½ºÅ×Æijë Stefano   19-09-17 20:36
´ëÃæ ¾Æ·¡ÀÇ Âü°íÀڷḦ ±âÁØÀ¸·Î ÇÏ¸é °è»êÇÒ ¼ö ÀÖ½À´Ï´Ù.


°ü ³»ºÎ¿¡¼­ÀÇ ´ë·ù¿­Àü´Þ°è¼ö    hi  =>  :http://contents.kocw.or.kr/KOCW/document/2015/chungnam/leewanghee/12.pdf

°üÇ¥¸é¿¡¼­ °ø±â¿¡ ÀÇÇÑ ´ë·ùÀü¿­°è¼ö ho ==> http://contents.kocw.net/KOCW/document/2015/chungnam/leewanghee/14.pdf
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