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Thread: Air conditioning airflow
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22-10-2008, 12:43 PM #1
Air conditioning airflow
hi any expert out there, i need your help.
One newly rehab air-con on the building i work in was not sufficiently cooling & after analyzing the problem,it seems that the problem got to do with the volume of air on new rehab a/c so i recommend to conduct a traverse.
I just want to what are the normal volume of air per capacity (tonne) of a/c. Hope someone can give any reference or manuals for this.by the way the capacity of unit is 20tonne.
edit: For tonne read TonLast edited by Brian_UK; 22-10-2008 at 06:49 PM. Reason: Post moved, Brian
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23-10-2008, 12:06 AM #2
Re: Air conditioning airflow
Hi Have a look at this it was found on GOOGLE you can find most of what you are looking for
http://wayneshirley.wordpress.com/20...g-low-airflow/
regards NormMy wife used to say you never listen to a word I say at least I think that what she said
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23-10-2008, 12:17 AM #3
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Re: Air conditioning airflow
It is about 400 CFM per Ton of refrigeration
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23-10-2008, 01:04 AM #4
Re: Air conditioning airflow
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27-11-2008, 01:05 PM #5
Re: Air conditioning airflow
I came up with the idea of an airflow problem when i observed the airflow of other unit (old unit with the same capacity) and the newly rehab unit, the new rehab unit seems to have a high air flow to the evaporator than the old one. I also tried to cover the inlet of one scroll,since the fan-coil unit have 2 scroll, to reduce the airflow and the result is I got a unit sufficiently operating.
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27-11-2008, 01:07 PM #6
Re: Air conditioning airflow
By the way, Lots of thanks for the reply !
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28-11-2008, 11:55 AM #7
Re: Air conditioning airflow
the amount of air flowing depends on the sensible cooling load of the space.
400 cfm per ton is a good rule of thumb
you could have a higjly sensible load like a server room and the airflow is more like 600 CFM per ton.
You could have loads that are need a lot of moisture removed like an assembly occupancy, and perhaps the air flow is 300 CFM per ton.
You can have 100% outside air and the ariflow could be 100 to 200 CFM per ton depending on how humid the ambient air wasTake the V out of HVAC and you are left with a HAC job
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