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  Equivalent Tube Length ±¸ÇÏ´Â ¹ý °¡¸£ÃÄ ÁÖ¼¼¿ä^^;;
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Æ©ºê °¡ ¿¤º¸¿ì, 180 U-Bend µîÀ¸·Î ¿¬°áÀÌ º¹ÀâÇÏ°Ô µÇ¾îÀִµ¥

Pressure DropÀ» ±¸ÇÒ·Á¸é equivalent tube length¸¦ ¾Ë¾Æ¾ß ÇÏÀݾƿä

±×·±µ¥ ´Ü¼øÈ÷ straight length°¡ ¾Æ´Ñ ¿©·¯°¡Áö ¿ä¼Ò¸¦

°í·ÁÇØ¾ß ÇÑ´Ù°í ÇÏ´õ¶ó±¸¿ä.

ȸ»ç Ã¥ÀÚ¸¦ ã¾ÆºÁµµ standard °è»ê½ÄÀÌ ¾ø°íÇؼ­¿ä.

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Stefano Stefano   39-08-02 00:00
(1) Valve, FittingÀÇ Equivalent Lengh´Â À̵éÀÌ ³ªÅ¸³»´Â Friction Loss¿Í µ¿ÀÏÇÑ  PipeÀÇ ±æÀ̸¦ ¸»ÇÕ´Ï´Ù. 

Fitting Á¾·ù¿Í Sizeº°·Î Equivalent Length¸¦ ³ªÅ¸³½ °ÍÀº µµÇ¥·Î ³ªÅ¸³ª Àִٰųª Table·Î ³ªÅ¸³ª ÀÖ½À´Ï´Ù.

Equivalent Length ´ÜÀ§·Î ³ªÅ¸³½ ÀÚ·á´Â 1973³â3¿ù Hydrocarbon Processing¿¡ Àß ¿ä¾àµÇ¾î ÀÖ°í

Hydraulic Institute³ª CraneÀÇ ÀÚ·á´Â Resistance Coefficient·Î ³ªÅ¸³ª ÀÖ½À´Ï´Ù. 

(2) Á÷Á¢ Equivalent Length·Î ±¸ÇÏ°í ½ÍÀº °æ¿ì Graph·Î ³ªÅ¸³½ °ÍÀ̳ª ÀüÀÚÀÇ ÀڷḦ ÂüÁ¶ÇÏ°í ±×·¸Áö ¾Ê°í Resistance Coefficne·Î ³ªÅ¸³½ °Ü¿ì¿¡´Â ´ÙÀ½°ú °°Àº ¹æ¹ýÀ» »ç¿ëÇÏ¸é µË´Ï´Ù.

Pipe·Î °¡Á¤ÇÑ Frictionl Head Loss = (f at complete turbulence)(Le/D) {V^2/(2gc)}...(1)
FittingÀÇ Frictional Head Loss = K {V^2/(2gc)}...(2)
K = N * (f at complete turbulence) ..............(3)

(À­ ½Ä¿¡¼­ gc=32.2 lbm/lbf ft/s2 for English Unit, gc=1 (kg-m/s^2)/N)

¿©±â¼­ Le´Â Fitting°ú °°Àº ¸¶ÂûÈ¿°ú¸¦ ³ªÅ¸³»´Â ¹è°üÀÇ ±æÀÌÀÔ´Ï´Ù. À­ ½Ä¿¡¼­ Le¸¦ ±¸ÇÏ·Á¸é 
(f at complete turbulence)(Le/D) = K = N*(f at complete turbulence)
Le = D * N ..........(4)

(3) ±×·¯³ª Equivalent Length¸¦ ±âÁØÀ¸·Î Çؼ­ Pressure DropÀ» °è»êÇϸé
Equivalent Length±âÁØ °è»ê½Ã ¹è°üÀÇ Head Loss = f (Le/D) V^2/2gc
ÇÑÆí Equivalent Length·Î °è»êÇÑ FittingÀÇ Head Loss
 = (f at complete turbulence) * (Le/D) * V^2/2gc 

À§ÀÇ µÎ ¹æ¹ýÀ» ºñ±³Çϸé f°ªµéÀÇ ºñ¸¸Å­ Â÷ÀÌ°¡ ³³´Ï´Ù.
Reynolds No°¡ Å« °æ¿ì µÚ µÎ ¹æ¹ý¿¡¼­ Head ¼Õ½ÇÀÇ Â÷ÀÌ°¡ ¾øÁö¸¸ ÀÛÀº °æ¿ì¿¡´Â ¹«½ÃÇÒ ¼ö°¡ ¾øÀ» °æ¿ì°¡ ³ªÅ¸³¯ °ÍÀ¸·Î º¾´Ï´Ù.

(3) ¿¹¸¦ µé¾î Screw Type U-turnÀÇ Resistance Coefficient°¡ K= 50 *(f at complete turbulence)¸é

Le = 50 * D °¡ µÇ´Âµ¥ À̸¦ ±âÁØÀ¸·Î
U-turnÀÇ Head ¼Õ½ÇÀº = (f at complete turbulence)*(50D/D)*V^2/2gc = 50 (f at complete turbulence)*V^2/2gc

¹Ý¸é À̸¦ ¹è°ü±æÀÌ LeÀÎ °üÀÇ ½ÇÁ¦ Head ¼Õ½ÇÀº f *(Le/D) * V^2/2gc = 50 f*V^2/2gc °¡ µË´Ï´Ù. 

À̵éÀÇ Â÷ÀÌ´Â ¹è°ü°æÀ» Á¤ÇÒ ¶§ Allowance¸¦ µÐ °ÍÀ̶ó°í °£ÁÖÇÏ´Â °æÇâÀÌ ÀÖ´Â °Í °°½À´Ï´Ù.

(4) ¾Æ·¡ÀÇ Site ÀڷḦ Âü°íÇϼ¼¿ä 
±èÅÂÇü ±èÅÂÇü   39-08-02 00:00
»çÀÌÆ® ÁÖ¼Ò°¡ ¾ø¾î¿ä..¤Ð¤Ð
ddd    10-08-16 14:38
   

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