Hi
Can someone suggest a method/Correlations for determination of LMTD correction factors(F) in helical coil heat exchangers?? Can I use the one used in shell and tube heat exchangers?
thanks
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Posted 11 March 2013 - 04:12 PM
Hi
Can someone suggest a method/Correlations for determination of LMTD correction factors(F) in helical coil heat exchangers?? Can I use the one used in shell and tube heat exchangers?
thanks
Posted 22 March 2013 - 01:34 PM
For preliminary design, use the same LMTD; then apply a correction for the Heat transfer coefficient for the coil side.
HTC multiplier = 1 + [3.5(Tube ID / Helical Dia)]
Good luck
Posted 23 March 2013 - 09:40 AM
Posted 31 March 2013 - 10:02 PM
Back to my notes , I found that for gas inside a coil , the heat transfer coefficient is calculated considering the equivalent length of a straight pipe and the result is multiplied by (1+3.5* Di/Dhe ) . This could apply for liquid too.
Di : pipe inside diameter and
Dhe :helical diameter
additional input
Jeschke (1925) provided an empirical correlation that allows for the increased heat transfer inside the coil
Where αi coil and αi (straight pipe) are the heat transfer coefficients on the inside of the coil and the equivalent straight pipe, respectively, and di and dc are the internal diameter of the pipe and the diameter of the coil, respectively.
Breizh
Edited by breizh, 07 May 2013 - 10:27 PM.
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