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Old   June 6, 2007, 19:57
Default Heat Exchangers NTU relations
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cfd-dude
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Hi all,

I am modeling heat exchangers. I am looking for Heat exchanger effectiveness relations & Heat exchanger NTU relations for 2-PASS CROSS FLOW exchanger both fluids unmixed. I want to compare numerical results with semi-analytical solutions. I cant find them in any book. Most give for single pass exchanger. I am wondering if such relations exist for 2-PASS exchangers. Any references are appreciated.

Thanks in Advance.

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Old   June 6, 2007, 23:16
Default Re: Heat Exchangers NTU relations
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momentum_waves
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For a 2-pass cross flow unit, split the exchanger in half & model as two units in series. This is standard practice in the industry.

The performance & pressure drop is the same.

mw

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Old   June 7, 2007, 03:33
Default Re: Heat Exchangers NTU relations
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Ahmed
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Try looking Heat Transfer (Second Volume) by Jakob, it is an old book but full of excellent information, Good Luck
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Old   June 8, 2007, 08:42
Default Re: Heat Exchangers NTU relations
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cfd-dude
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Thanks to mw & Ahmed for your response. MW made an very good suggestion. I might just do that!

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Old   June 9, 2007, 01:01
Default Re: Heat Exchangers NTU relations
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momentum_waves
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The suggestion I made is standard design practice in the htd (heat-transfer device) industry. Refer to Ralph Webb for instance. It is logical & it works in practice.

Best of success.

mw
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