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Thread: HEPA Filter for low temp (-15C)
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27-03-2012, 06:22 PM #1
HEPA Filter for low temp (-15C)
Hi guys, I new to this group & glad to join the group to discuss Refrigeration.I need some help for conditioning of the air. If anyone have come across the following problems, please advise.Previously, I have a fresh air system for food process. Air is conditioned through 3 AHUs to +2C & is filtered by HEPA from AAF of AAF AstoCel 1. Recently I done a upgrade of the system & brought the air temp down to -15C. However I noticed that HEPA freezed after 30 min of operation & system pressure went from 1.6KPa to 4KPa. When we revert back to the old parameters, system pressure went back to 1.6KPa.Therefore I am asking if anyone have done a project like this & have come across this problem. Also, do anyone know if there are HEPA filtration for temp as low as -10/-15C?Thanks in advance, Hui
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27-03-2012, 07:51 PM #2
Re: HEPA Filter for low temp (-15C)
Never had this problem in particular, though I know you have to change the type of filter if you have now high relative humidity or the velocity profile changed.
You should contact the filter supplier.
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28-03-2012, 03:08 AM #3
Re: HEPA Filter for low temp (-15C)
We are currently seeking advice from AAF on the suitable type of HEPA.
The air velocity was changed from 143 to 165m3/min
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28-03-2012, 04:31 AM #4
Re: HEPA Filter for low temp (-15C)
Your filter is not freezing up, it just becoming blocked with ice particles that are suspended in the air.
Think of it as "Ice dust"
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28-03-2012, 11:05 AM #5
Re: HEPA Filter for low temp (-15C)
Hi mad fridgie,
That certainly ring a bell!!! I noticed the area after my -15C coil & before the HEPA to be fill with 'snow'. You know of any product on how we can 'catch' these dust out from the air before reaching the HEPA?
Thanks, Hui
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28-03-2012, 02:13 PM #6
Re: HEPA Filter for low temp (-15C)
It looks like you are working in an oversaturated region, thus the fog.
Drying the air may help.
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28-03-2012, 10:14 PM #7
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02-04-2012, 09:46 AM #8
Re: HEPA Filter for low temp (-15C)
hi guys, thanks for all your help.
I shifted the HEPA upstream before my -15AHU. Also explained the mystery for the chocked filter. Thanks You