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Help sizing blower for flow hood with altitude conversion


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#21 panacea

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Posted 23 March 2021 - 01:57 PM

Thanks sandman!

 

I heard back from Baker, they sent this:

 

Hello,

 

Attached is section 3.11 of “Industrial Ventilation – A Manual of Recommended Practice for Design – 28th Edition”.

 

Hope this helps. Let me know if there is anything else I help with.

 

Sincerely,

 

and this was attached:

 

(It's only two pages)

 

 

Attached Files


Edited by panacea, 23 March 2021 - 01:58 PM.


#22 sandman

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Posted 23 March 2021 - 03:09 PM

I start getting a bit glassy eyed when the math formulas come out, but looks like 

 

I see this part 

 

Formulas for pressire effects (either due to ... or elevation of the plant above sea level can be derived from the same ideal gas equation (and considered in units of inch w.g.)

 

 

[1-((6.73)(10-6)(z))] where z is the ft elevation above sea level. which for 7000 ft equals 0.95289" and for 500' = 0.996635".

 

There is also another formula under it that results in 7000' @ 0.84544" and 500' @ 0.98896"

 

I don't know what the difference in formula is I think one has IP and one has SI near the reference number.

 

It would seem pretty negligible with only a 0.04" difference between you and a 500' person and in the second formula a 0.14" difference.


Edited by sandman, 23 March 2021 - 03:19 PM.


#23 sandman

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Posted 24 March 2021 - 07:31 AM

slight typo in that formula should of typed as [1-((6.73)(10^-6)(z))] 



#24 TVCasualty

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Posted 24 March 2021 - 10:44 AM

The thing with the turbo analogy is that it doesn't just require the turbo to push more air than the engine consumes (which would be just a slight positive pressure), it needs to push several times more than that.


Yes, I understand how turbochargers work in engines. The thing with the turbo analogy in this context is that it was an analogy.






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