Dear Crispin, 50 grams per cu meter is a lot of stuff. I wonder what a cigarette is?
So all the heat that goes in the room is 'good' heat and that leaving the room is lost heat to do the calculations? Is the height where the inside-outside heat standard or site specific? The compressor taking in CO2 free air is making the dilution? What is used to scrub the CO2 from the air? The CO2 produced is measured real time(?) using IR detection? If CO2 is produced at varying concentrations as the fuel combusts how is it used as a measure of air dilution? Thanks Frank Thanks Frank Shields BioChar Division Control Laboratories, Inc. 42 Hangar Way Watsonville, CE 95076 (831) 724-5422 tel (81) 724-3188 fax <mailto:[email protected]> [email protected] www.controllabs.com From: Stoves [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Monday, June 03, 2013 11:25 AM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] SEET Lab in Ulaanbaatar running again in its new home Dear Frank Thanks. The burn room is a bit small (the stoves run up to 30 kW) but the instrument room is large. We often have a lot of visitors so 20 people can easily fit in the room to see the whiteboards. The stoves all have chimneys so a gas sample is drawn from the chimney. The temperature at the height at which the chimney exits the living space (the 'heated envelope') is recorded to calculate the thermal efficiency of the system as a whole. A hood can be used with small stoves (which are thought of as 'picnic stoves'!) connected to the chimney which is what is done at the SeTAR Centre. There are several humming motors and the compressor and CO2 adsorber is not in the same room (noisy). You can see the diluter stuck into the lower end of the chimney. This is fed dry air that reduces the copious moisture level to something that will not condense. We don't want to measure 'fog' as 'particles'. The dilution is variable at the touch of a needle valve. The dilution is monitored by tracking the level of CO2 in the stack and diluter - a good suggestion made by Tami Bond some year ago. Last week we managed to measure smoke that reached 50 grams per cubic metre of air (undiluted), far beyond our previous record of 17. Fifty million micrograms is a heck of a snort for a lab to deal with. We are looking at ways to reduce the amount of moisture and volatile vapours in the while system. If we can get it out early, it makes everything last a heck of a lot longer. Regards Crispin
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