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Posted by Zephyr on June 4, 2007, 7:39 pm
Funny thing, mold. Mold likes to grow in a dark environment. Mold likes to
be warm. Mold needs some organic material to breed upon. Mold is in the
air all around us. Mold spores are in the air around us all the time.
Funny things about air conditioning & refrigeration. The coil seems to run
cool compared to other environments. [40º F in air conditioning]. Mold
doesn't necessarily like cold. If the homeowner keeps up on the filters,
there's little organic material.
What happens is during the off cycle / winter months, mold can develop
provided there is some water available. Eventually, the water is gone, the
mold dies, but alias, it does foul the coil.
And yes UVC will prevent mold build up to begin with. But I believe a
standard incandescent light will too for a whole lot less $$$.
Don't get me wrong, I install UVC 's when the customer wants / needs them.
But for the sake of arguing, I'm arguing. <G>
BTW: Could you please type using capitol's at the beginning and periods at
the end of your sentences. And please use coherent verbs, nouns, and
participles. It makes for easier reading. Thanks.
--
Zyp
> kool wrote:
in
> >> Zephyr wrote:
> >>> What I find funny Noon is that if you read the reports posted by the
O.P.
> >>> ,
> >>> you 'll find the EPA testing is in regards to "aerosol effects" in
> >>> relationship to "harmful" materials that could be introduced into an
HVAC
> >>> system. The testing basically was to see if UVC lamps would help
reduce
> >>> biological agents introduced into the HVAC. I didn't see anything
about
> >>> "mold", or "efficiency" or even "allergies."
> >>>
> >>> The GSA recommendation is interesting in that it directly contradicts
the
> >>> Mfg.s' recommendations. Some UVC Mfg.'s suggest putting lights in
> >>> several
> >>> duct system locations "other than downstream."
> >>>
> >>>
> >>> And, I didn't see any reference to NOT SELLING these devices to the
> >>> public?
> >>>
> >>> At least that's my take on the reading... I might have missed
something
> >>> though.
> >>>
> >> Ok there are two different types for a HVAC system the one you read
from
> >> the EPA is typically installed on the downstream air to kill yes
> >> biological, but if you can kill them the amount of the UV dose nm~cm2
the
> >> biological (anthrax 46,000 nm~cm2 ) are the highest in the range. So
all
> >> that would fall below that UV-C dose range as "allergens", viruses and
> >> bacterias would be killed.
> >>
> >> Now as far as "mold", "efficiency" and "allergens". Mold would call
for
> >> coil irradiation. As you know mold is always and continuously growing
on
> >> the coil because it is a perfect environment for mold to grow.
> >>
> >> When the UV-C is applied to the face of the coil it will kill the mold,
> >> thus having pressure drop across the coil which would equal
"efficiency".
> >> The motor for the unit would not have to work as hard because there is
not
> >> restriction on the coil (mold) on the air flow; so you will accomplish
> >> extended life of the HVAC, energy saving becasue the unit is not
working
> >> as hard and no maintenance to clean the coil with pressure washing
which
> >> would not be as well. Plus, the fouled air would not be as fouled.
> >>
> >> Hope my explanation was helpful.
> >
> > An air side pressure drop would lessen the air flow and reduce the
amount of
> > work that the fan motor has to do.It would also reduce the load on the
> > compressor so how can you claim -
> > " The motor for the unit would not have to work as hard
> >> because there is not restriction on the coil (mold) on the air flow"
> >
> >
> If the coil was all clogged up with mold, would there not be a
> restriction on the air flow? Yes, there would so if the coil is no
> longer clogged with mold then what I said would happen, no? Not to
> mention you would no longer be spreading mold throughout a building.
> And I forgot to mention before some HVAC manufactures sell this as a OEM
> in their shipped units.
>
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