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  ±Û¾´ÀÌ : ±è´ÙÈò   °íÀ¯ID : rlaekgmls     ³¯Â¥ : 13-12-11 19:26     Á¶È¸ : 4846    
¾È³çÇϼ¼¿ä Á¦°¡ Áö±Ý Ç¥¸é¿­Àü´Þ°è¼ö¸¦ ±¸ÇÏ°í Àִµ¥ µµÀúÈ÷ ´äÀÌ ¾È³ª¿Í¼­ µµ¿òÀ» ¿äûÇմϴ٤ФРºÎŹµå¸³´Ï´Ù¤Ð¤Ð
 
¹®Á¦1. water flowing 3inch (³»°æ) pipe
cp: 1 Btu/LbF
k: 0.37 Btu/hr ft F
m(Á¡µµ): 3.75*10^(-1)Lb/ftsec
p(¹Ðµµ): 62.4Lb/ft^(3)
V: 1ft/sec
 
À϶§ °­Á¦´ë·ù½ÄÀ» ÅëÇؼ­ ´©¼¿Æ®¼ö¸¦ ÀÌ¿ëÇؼ­ h(°Ý¸· ¿­Àü´Þ °è¼ö) ¸¦ ±¸ÇÏ·Á°í Çϴµ¥¿ä
 
´©¼¿Æ®¼ö=0.023(·¹À̳îÁî¼ö)^(0.8) (ÇÁ¶õƲ¼ö)^(0.4) - À¯Ã¼°¡ ³»ºÎ¿¡¼­ È带¶§
´©¼¿Æ®¼ö=0.26(·¹À̳îÁî¼ö)^(0.6) (ÇÁ¶õƲ¼ö)^(0.3) - À¯Ã¼°¡ ¿ÜºÎ¿¡¼­ È带¶§
 
´©¼¿Æ®¼ö=hD/k
ÇÁ¶õƲ¼ö=Cpm/k
 
¶ó°í ¾Ë°íÀִµ¥¿ä Á¦°¡ »ý°¢ÇßÀ»¶§ À¯Á¦°¡ ³»ºÎ¿¡¼­ È带¶§¸¦ ÀÌ¿ëÇÏ´Â °ÍÀ» ÀÌ¿ëÇؼ­ ±¸Çغôµ¥¿ä
´äÀº h=341 Btu/hrft^(2)F ¶ó°í Çϴµ¥ ÀÌ °ªÀÌ ¾È³ª¿Í¼­¿ä
 
ÀÏ´Ü ¹®Á¦´Â 3ÀÎÄ¡¶ó°í ÇßÀ¸´Ï±î ft·Î °íÃļ­ 0.25ft·Î °è»êÇÏ°í k´Â ´ÜÀ§°¡ ½Ã°£ÀÌ¿©¼­ ÃÊ·ÎÇؼ­ 3600À¸·Î ³ª´³´Âµ¥
Á¦°¡ °ø´ë»ýÀÌ ¾Æ´Ï¿©¼­ ´ÜÀ§¸ÂÃߴ°͵µ ¸ð¸£°Ú¾î¼­ ¹¹°¡ À߸øµÈ°ÇÁö µµÀúÈ÷ ¸ð¸£°Ú½À´Ï´Ù¤Ð¤Ð
 
h°ªÀº ¾î¶»°Ô ±¸ÇؾßÇϳª¿ä?¤Ð¤Ð
 
 
¹®Á¦2. ¹°ÁúÀü´Þ¿¡¼­
ÀÌ·²¶§ Á¦°¡ ±¸ÇÑ°ÍÀº material balance: 100= X+Y
                              solid balnce: 22=0.76X+0Y
                             µû¶ó¼­ X´Â 29kg Y´Â 71kg À̶ó°í ³ª¿Ô½À´Ï´Ù.
ÀÌ °ÍÀ» °íÇüºÐÀº »ý°¢¾ÈÇÏ°í ¹°¸¸°¡Áö°í water balance¸¦ ¾î¶»°Ô ±¸Çϳª¿ä?
Àú´Â 100=X+Y ¸»°í´Â ¹°¸¸°¡Áö°í ¾î¶»°Ô ±¸ÇÒÁö °íÇüºÐÀÌ ¾ø´Âµ¥ °¨ÀÌ ¾ÈÀâÈû´Ï´Ù.¤Ð¤Ð
 
¶ÇÇÑ ±×·¸´Ù¸é Àú À§¿¡ ³óÃà±â¿¡ A¸¦ Áý¾î³Ö¾î¼­ B¸¦ ¸¸µé¶§ ¼öºÐÀÌ ºüÁöÀܾƿä À̶§ ´Ù¸¥¹°ÁúC¸¦ ³ÖÀ¸¸é À̶§´Â Áý¾î³ÖÀº°ÍÀÌ A+CÀÇ °ªÀ¸·Î »ý°¢ÇÏ¸é µÇ´Â °Ç°¡¿ä? Áï C¸¦ 10KGÀ̶ó°í ÇÒ¶§ ÃÑ 110KGÀ̶ó°í »ý°¢ÇÏ°í ¹æÁ¤½ÄÀ» ¸¸µé¸é µÇ³ª¿ä?
 
 
¹®Á¦3. Energy balance
        A                                                  B
¿¡³ÊÁöINÀº A ¿¡³ÊÁö OUTÀº BÀ϶§
¿¡³ÊÁö IN  H=mCp(T1-T2)
¿¡³ÊÁö OUT = mCp(T1-T2)+mCp(T1-T2)
Cp(dryair)=0.24
Cp(vapor)=0.45
À϶§ ´ÜÀ§°¡ Á¦°¡ ±¸ÇÑ°Ô ¸Â´ÂÁö ¿©Â庸°í ½ÍÀºµ¥¿ä
¿¡³ÊÁö IN(100Lb dryarie/h)(0.24 Btu/LbF)(82-32)F À϶§ ´ÜÀ§´Â dryairBtu/hr
¿¡³ÊÁö OUT(100Lb dryarie/h)(0.24 Btu/LbF)(62-32)F+0.6Lb/hr(0.45Btu/LbF)(62-32)F À϶§ ´ÜÀ§´Â Btu/hr
°¡ ³ª¿À´Âµ¥¿ä ¿¡³ÊÁöin,outÀÌ ¼­·Î ´ÜÀ§°¡ ´Þ¶óµµ µÇ³ª¿ä?
°á±¹ ¿¡³ÊÁö in ,outÀ¸·Î ¹«¾ùÀ» ¾Ë¼ö Àִ°ǰ¡¿ä?  
 

 
 


½ºÅ×Æijë Stefano   13-12-12 12:52
Á¦¸ñ¿¡ Å°¿öµå ¾øÀ¸¸é ´äº¯À» ¾ÈÇÕ´Ï´Ù.
   

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