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PhytoExtractum Shop: Maeng Da Thai Kratom Leaf Powder

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Offlinekocos
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Registered: 11/13/07
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Help Kocos with his HEPA, thread.
    #7689367 - 11/28/07 07:19 AM (16 years, 2 months ago)

High good people.

I would seek some assistance with the construction of my very own laminar flowhood . I received my very own, precious 36 x 24 x 5.8 inches HEPA yesterday. My main concerns are around the correct fan, the output, and static pressure calculations. Let me show you what i have done so far, and please plase correct me if iam wrong. First off the area of the filter surface has to be calculated.
36 x 24 x 5.8 inches = 91,44 cm x 70 cm = 6400,8 cm3,
turning this into cubicmeters 6400,8/10,000= 0.64008m3
One must then multiply recomendedd airspeed with surface area of filer.

Recomendedd airspeed 100feet/m (Stamets) = 33.333333m/m
33.333333 x 0.64008 = 21.336 cubicmeter/minute
To get cubic meters/hour ( which is the measuring unit used here in Europe) 21.336 x 60 = 1280,16 m3/h

This seems like a hell of a lot of air... In anycase iam now stuck 1280,16 m3/h is the amount of air which the blower must deliver under the static pressure caused by the filter and the prefilter. Iam not sure how this can be inserted into the eqvation, iam assuming i would have to find out what static pressure the HEPA and the prefilter creates then go from there...


Ok another thing i would like some opinions about. The fan sold specifically for this HEPA , produces 1040 cfm at .8 static pressure. I would like some opinions on what 1040 converts to in cubic meters/hour. I think i have the anwser i just want to see some other results so i can justify my own. Conversion help below.

http://forum.onlineconversion.com/showthread.php?t=672


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OfflineRogerRabbitM
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Re: Help Kocos with his HEPA, thread. [Re: kocos]
    #7690189 - 11/28/07 12:01 PM (16 years, 2 months ago)

That blower should be fine. You have 6 square feet of filter, so you would want 600 cubic feet per minute(cfm) from your blower to give 100 linear feet per second out the front, assuming no losses from friction, efficiency, and the prefilter. Your blower is larger than that, so by the time you get your hood built and prefilter installed, the flow should be close to or just above the optimum range, which is fine. If necessary, you can cut down the flow with a motor speed controller, or by blocking part of the intake.
RR


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OfflineAnnoA
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Re: Help Kocos with his HEPA, thread. [Re: kocos]
    #7690198 - 11/28/07 12:02 PM (16 years, 2 months ago)

>First off the area of the filter surface has to be calculated.
>36 x 24 x 5.8 inches = 91,44 cm x 70 cm = 6400,8 cm3

The surface is 36in x 24in = 6 square feet

6 sqft x 100 ft= 600 cfeet = 17 cubic meters per minute = 1020 m3/h.

>In anycase iam now stuck 1280,16 m3/h is the amount of air which the blower
>must deliver under the static pressure caused by the filter and the prefilter.

1000 m3/h, yes.

>iam assuming i would have to find out what static pressure the HEPA and the prefilter creates then go from there...

Exactly.

>Ok another thing i would like some opinions about. The fan sold specifically
>for this HEPA , produces 1040 cfm at .8 static pressure.

Sounds roughly right for that hepa.


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Invisiblegreys
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Re: Help Kocos with his HEPA, thread. [Re: kocos]
    #7690333 - 11/28/07 12:27 PM (16 years, 2 months ago)

Quote:

kocos said:
High good people.

I would like some opinions on what 1040 converts to in cubic meters/hour.





i think this is the question he wanted answered.


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:greys:


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Offlinekocos
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Re: Help Kocos with his HEPA, thread. [Re: greys]
    #7693365 - 11/29/07 12:39 AM (16 years, 2 months ago)

Looks like we are getting somewhere :smile: The reason i wanted some opinions on this is because i found a blower here locally which i would prefer over one shipped across seas. This blower produces 1800 cmh or cubic meters per hour. Considering that, according to our calculations the 1040 cfm converts to roughtly 1766.97 cubic meters per hour. Taking into consideration the static pressure from the HEPA (.8) and static pressure from the prefilter(X)the 1800 cmh should pretty much do the trick. Thoughts on this? Here is that blower, about middle of page code WB-16B
http://home.hu.inter.net/univex/newpage6.htm.


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OfflineRogerRabbitM
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Re: Help Kocos with his HEPA, thread. [Re: kocos]
    #7694026 - 11/29/07 08:46 AM (16 years, 2 months ago)

You'll need to make sure that 1800 cubic meters per hour is delivered at the equivalent of 1" of static pressure. If so, it should work.
RR


--------------------
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semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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Offlinekocos
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Re: Help Kocos with his HEPA, thread. [Re: RogerRabbit]
    #7694055 - 11/29/07 08:59 AM (16 years, 2 months ago)

Great stuff, looks like we are reaaady too rumblee :laugh:

Thanks dude!


Edited by kocos (11/29/07 09:02 AM)


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