[Stoves] Personal Particulate Monitor

[Nikhil Desai]

Andrew:

Re: " If this is the case it seems to open up a  possibility:"

Yes, and with some degree of automation, it may be possible to take a
stove, fuel, building, cooking, cook, in their entirety for a few days
every season for a given region and model some approximation between hourly
emission rates, concentrations and exposures.

A vast improvement that would bury the EPA/BAMG indoor air circulation
modeling.

Should have been buried 20 years ago but for the WBT mania. Even now, WHO
and ISO need to get away from the lie that emission rates in labs can be
modeled into "cleanliness" of cookstoves.

It is not the stove but the air that needs to be cleaner or clean enough.
You are imagining the right hardware; it will take some time to reprogram
the software (brainware).

Nikhil

------------------------------------------------------------------------
Nikhil Desai
(US +1) 202 568 5831
*Skype: nikhildesai888*


On Fri, Sep 14, 2018 at 4:11 AM, Andrew Heggie <aj.heggie at gmail.com> wrote:

> On Thu, 13 Sep 2018 at 14:06, Crispin Pemberton-Pigott
> <crispinpigott at outlook.com> wrote:
> >
> >
> > The measurement method is a direct measurement of concentration at the
> time so it is fine for ambient or indoor air.
>
> If I understand you correctly and it would affirm Norbert's view, the
> measurement is when the laser takes a snapshot of a known volume and
> calculated the mass from that, so it the flow is not a factor.
>
> If this is the case it seems to open up a  possibility:
>
> Because the output of the Python script is time stamped it would be
> feasible to have a number of long tubes to different parts of the room
> the stove is used in. A rotary valve could then choose which  tube was
> sampled, after allowing for the tube to purge and as long as the time
> on the laptop was  recorded at each change a picture of the
> distribution of particulates in the room throughout the cooking
> process could be seen.
>
> Mind these are relatively cheap so more than one could be deployed for
> the same purpose.
>
> I note the life of the device is stated at 3000hr of use.
> > ‎
> > If you want to know the total mass you need aa determination of total
> volume and measurements at time intervals, usually fixed like per 10 or 30
> seconds. A filter gives a total mass collected.
>
> Yes but one could also integrate the output over time but that's why I
> mentioned running alongside Anil's soot plate idea as that also gives
> an integrated result over time.
>
> Andrew
>
>
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