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Lmtd Is Not Valid

heat transfer heat exchanger lmtd zone analysis

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#1 panoskagiou

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Posted 18 August 2019 - 03:29 PM

Dear all,

 

What are the cases in which the LMTD cannot be used?

What is the zone analysis used in the exchangers?

 

Thank you in advance!



#2 srfish

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Posted 20 August 2019 - 03:43 PM

The standard LMTD can should not be use if there is not a straight line heat release.



#3 panoskagiou

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Posted 21 August 2019 - 02:16 PM

I did understand you!



#4 sgkim

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Posted 22 October 2019 - 01:55 AM

LMTD can not be calculated if one of end point differential temperatures is the same as the other,    (LMTD =   (Δt1 - Δt2)/ln (Δt1 / Δt2),  ln 1 = Error)

 

Zone analysis should be used if significant difference or heat-duty is involved in the particular zone of a exchanger.

 

Stefano, Kim






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