Re: Air quality

["Neil Fuller" <neil@xxxxxxxxxxxxxxxxx>]

Nice but maybe a little expensive to install on an HVAC system trying to
measure overall air quality!!!
----- Original Message -----
From: "Simon Rafferty" <simonr@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, May 25, 2004 9:31 PM
Subject: Re: [ukha_d] Air quality


> The technologies that I am referring to also drift, hence require
weekly
> calibration with reference 'pure' gasses, but they will give you an
absolute
> reading, ie Ozone is at 45ppm at time X. There is a manufacturer of
small
> pollution monitors called streetboxes, which are accurate to around
10% (I
> think), are solar powered and cost about a grand each (about the size
of a
> shoebox) and are bluetooth compatible.
>
> Simon
> ----- Original Message -----
> From: "Neil Fuller" <neil@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Tuesday, May 25, 2004 9:07 PM
> Subject: Re: [ukha_d] Air quality
>
>
> > There are a number of technologies for measuring air quality. The
problem
> is
> > defining exactly what is meant by the term and exactly what you
want to
> > measure.
> >
> > There are several "Air Quality" sensors available
commercially. They
tend
> to
> > be fairly expensive (Trend Controls AQ/S is GBP128 although
Electro
> Controls
> > EAQ (
> >
>
http://www.electrocontrols.co.uk/htmlcatalogue/airqualityandgassensors.htm
)
> > is more reasonable at GBP50)
> >
> > All of the technologies suffer from drift and their measurements
are
> > relative - the air is relatively good or bad rather than the air
is 23%
> > polluted!
> >
> > Somewhere, I have a BSRIA guide to measuring air quality. It's
aimed at
> the
> > HVAC industry. The subject was researched with a view to reducing
the
> fresh
> > air requirements in mechanically ventilated buildings with low
occupancy
> > density. The industry norm is to supply a minimum 10% fresh air
in to a
> > building when an AHU is on 'full' recirculation. As conditioning
outside
> > fresh air is fairly expensive under most circumstances, BSRIA
were
looking
> > at methods of measuring the quality of the extracted air and use
that to
> > ensure that there is sufficient fresh air supplied in to the
building.
> >
> > IIRC, the conclusion was that the air quality sensors were not
accurate
> > enough and different manufacturers sensors were sensitive to
different
> > ranges of pollutants and therefore could not be relied upon.
> >
> > One aspect that they did find was that (unsurprisingly) all the
sensors
> > showed peaks in air quality (higher = bad) during the morning and
evening
> > rush hour. The closer the building was to a road, the worse the
air
> quality.
> >
> > If I can find the document, I'll happily pass it on to anyone
interested.
> > It's in PDF mail me at work - nfuller at global-associates dot co
dot uk
> > with BSRIA report in the subject if you want a copy or I could
upload it
> (if
> > I can work out how to do that!!!!!!)
> >
> > Regards
> >
> > Neil
> > ----- Original Message -----
> > From: "Young, Jeff" <Jeff.Young@xxxxxxx>
> > To: <ukha_d@xxxxxxx>
> > Sent: Tuesday, May 25, 2004 1:01 PM
> > Subject: [ukha_d] Air quality
> >
> >
> > > Anyone know of a way of monitoring levels of polution in the
air?  I
> live
> > > fairly near a main road and I've been thinking for some time
of
> monitoring
> > > the level of rubbish in the air and possibly providing the
results on
a
> > web
> > > site.
> > >
> > > Thanks in advanced.  Jeff
> > >
> > >
> >
>
>
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