[Stoves] WorldStove replies to BioFuelWatyche'slatestimprecisereporting of facts.

Tue Jul 26 19:38:35 CDT 2011

Dear Roger

It is nice that you can burn a 5 lb log for 12 or more hours. In Mongolia they will freeze to death at that power level, however. When it is -35 deg and you are living what is basically an insulated tent, you need about 5 kW delivered into the home. 

The traditional wood stove used is about 70 % efficient. When it is used to burn coal, they are lined with bricks. This cuts the efficiency to about 55%. THe efficiency cam easily be raised again by increasing the size of the heat exchanger between the fire chamber and the chimney. I increased its length from 160mm to 300mm and the efficiency rose above 80%. 

At that efficiency, and to be suitable for Mongolia, you will have to burn about 1 to 1.5 pounds of wood per hour. If you cam do that, you may have something to show. 

Have you ever had your stove tested for CO emission during the burn? A log of the data during the burn is needed to know what the efficiency is because it is part of the losses. 

Regards
Crispin
-----Original Message-----
From: Fireside Hearth <firesidehearthvashon at hotmail.com>
Sender: stoves-bounces at lists.bioenergylists.org
Date: Tue, 26 Jul 2011 17:22:04 
To: <stoves at lists.bioenergylists.org>
Reply-To: Discussion of biomass cooking stoves
	<stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] WorldStove replies to BioFuelWatyche's
 latestimprecisereporting of facts.

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