fi fan heat exchanger

[lomli]

Hi,

we have to replace an existing heat exchanger ( a condenser using cold water ) by an air cooler ( fin fan), the elevation is about 4000 mm and we look to lift it to about 12000 mm,is is it possible to determine how this will perform the process, otherwise , between 4 m elevation and 12 m elevation, is there a real change, is it a way to optimise process conditions?

 

[speco]

lomli,

This change in elevation really is not significant at all, at least as the fans are concerned. To be really significant the change in elevation would need to be on the order of hundreds of meters.

On the question of optimization, it really depends on your optimization criteria. That is, capital cost, operational cost, noise, plot area available, etc.

Regards,

speco (

http://www.stoneprocess.com)

 

[lomli]

thank you speco, but how can I proove that ? have you any paper or article, or

thank you very much

 

[lomli]

thank you M. speco, but how can I proove that ? have you any paper or article, or

thank you very much

 

[speco]

Lomli,

The only significant change with respect to the cooling fans is the air density, which affects the static pressure across the tube bundle and the air volume that the fan has to move. The higher the altitude, the less dense, therefore more ACFM, and more fan horsepower.

Here's a formula in Imperial units for altitude correction of air density, as used by a prominent fan manufacturer.

Corr Factor = e^(.000037 * alt)

Where e = 2.71828 (base of natural logarithms)

alt = elevation above sea level in feet

If you plug in various values of alt you will see that the height above sea level has to be a pretty big number for the altitude correction factor to be significant.

Regards,

Speco (

http://www.stoneprocess.com)

 

[speco]

Correction!

The expression should read...

Corr factor = e^(-.000037*alt)

Regards,

Speco

 

[lomli]

thank you very much, M speco