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UV lights in AC coils?

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UV lights in AC coils? Don Wiss 03-01-2008
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Posted by on March 3, 2008, 8:57 pm
UV does have it's applications.

However, It is expensive for the normal, low maintenance homeowner.
UV does have a 1/2 life, something the manufactures have not
advertised so well in the residential market. A fact that some
contractors themselves have not embraced, I wish I had taken pictures
of their faces when I had them actually read the literature.

Evaporator Coil (specifically pan) properly installed should not have
standing water so this is not my concern with mold. In fact, it
should not be taken into my consideration for recommending a UV
system. (But what can I say, I push routine maintenance too.)
However, I do live in a rain forest where RH is extremely high. It is
the health of the occupants that determine if I recommend an UV system
and I do take the time to explain 1/2 lifes, etc....

I find that a properly installed system with a healthy family do not
require the addition of UV, there are other, cost effective systems
that will keep IAQ well within acceptable limits for a majority of
households.

But here is a question for you techies: Ever try to tar your
environmental test equipment outside within "environmental norms" to
find the house way below (meaning lacking even the slightest trace of
natural pollutants such as asbestos or CO found in the area?--and no
UV installed?)

Posted by a on March 4, 2008, 1:31 pm
becauseofjunk@mailcan.com wrote:
> UV does have it's applications.
>
> However, It is expensive for the normal, low maintenance homeowner.
> UV does have a 1/2 life...

OK - The Honeywell products are not *that* expensive, and UV is used in
*many* water treatment systems and they are not that expensive... UV
half-life? No. You mean a radioactive half life expressing the rate of
decay? That's like saying light has a half-life, or radio waves have a
half-life - they do not. Half life is an expression of the rate of decay
of a substance (or a biological system) - not the MTBF or service life of a
product. Maybe you mean the phosphors that are used to create the UV
radiation has a half-life?

All things wear out - UV bulbs included, but what I like about some of the
the Honeywell units is that they can sense when the air is moving and then
turn on - extending bulb life past the usual one year.

a

Posted by Don Klipstein on March 4, 2008, 6:04 pm
>becauseofjunk@mailcan.com wrote:
>> UV does have it's applications.
>>
>> However, It is expensive for the normal, low maintenance homeowner.
>> UV does have a 1/2 life...
>
>OK - The Honeywell products are not *that* expensive, and UV is used in
>*many* water treatment systems and they are not that expensive... UV
>half-life? No. You mean a radioactive half life expressing the rate of
>decay? That's like saying light has a half-life, or radio waves have a
>half-life - they do not. Half life is an expression of the rate of decay
>of a substance (or a biological system) - not the MTBF or service life of a
>product. Maybe you mean the phosphors that are used to create the UV
>radiation has a half-life?
>
>All things wear out - UV bulbs included, but what I like about some of the
>the Honeywell units is that they can sense when the air is moving and then
>turn on - extending bulb life past the usual one year.

The UV bulbs for sterilization do not have phosphors. The glass/quartz
does becoome a little less transparent to the germicidal UV as the bulb
ages.

- Don Klipstein (don@misty.com)

Posted by hallerb@aol.com on March 4, 2008, 6:23 pm
On Mar 4, 6:04=EF=BF=BDpm, d...@manx.misty.com (Don Klipstein) wrote:
> >becauseofj...@mailcan.com wrote:
> >> UV does have it's applications.
>
> >> However, It is expensive for the normal, low maintenance homeowner.
> >> UV does have a 1/2 life...
>
> >OK - The Honeywell products are not *that* expensive, and UV is used in
> >*many* water treatment systems and they are not that expensive... =EF=BF=
=BDUV
> >half-life? =EF=BF=BDNo. =EF=BF=BDYou mean a radioactive half life express=
ing the rate of
> >decay? =EF=BF=BDThat's like saying light has a half-life, or radio waves =
have a
> >half-life - they do not. =EF=BF=BDHalf life is an expression of the rate =
of decay
> >of a substance (or a biological system) - not the MTBF or service life of=
a
> >product. =EF=BF=BDMaybe you mean the phosphors that are used to create th=
e UV
> >radiation has a half-life?
>
> >All things wear out - UV bulbs included, but what I like about some of th=
e
> >the Honeywell units is that they can sense when the air is moving and the=
n
> >turn on - extending bulb life past the usual one year.
>
> =EF=BF=BD The UV bulbs for sterilization do not have phosphors. =EF=BF=BDT=
he glass/quartz
> does becoome a little less transparent to the germicidal UV as the bulb
> ages.
>
> =EF=BF=BD- Don Klipstein (d...@misty.com)- Hide quoted text -
>
> - Show quoted text -

many years ago hamilton gas dryers had these lamps. many years like
2nd world war

Posted by Old & Grumpy on March 2, 2008, 11:46 am

> I'm replacing my central air conditioner with a much more efficient one.
> (I
> hope Congress restores the $500 tax credit this year!) One of the options
> I
> can buy is UV lamps for the coils. Carrier makes these claims:
>
> - Kills bacteria & mold growing on the indoor coil
> - Enhanced indoor air quality
> - Enhanced air flow
> - Minimizes microbial build-up on coils

> - "THERE FOR" Improves system efficiency

>
> See: http://www.residential.carrier.com/products/airquality/uvlamp/
>
> Now I don't yet know how much this option is (or the annual replacement of
> the bulbs). But is this something worth considering?
>
> Don <www.donwiss.com> (e-mail link at home page bottom).



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