[Stoves] Stoves for Ukraine?

[Crispin Pemberton-Pigott]

Dear Paul

I reviewed this project for someone else recently. I think the $250 is for materials. I wonder...

I was unable to get an review of the performance.  It looks pretty conventional - a box with a chimney.  From the air hole size under the grate, it probably has a very high excess ait level in the chimney (typical for design guesses) and has a high heat loss.  In that region people tend to believe that if the chimney is not very hot, the efficiency is high.  In reality, if the excess air level is high, a large amount of air is passing through the stove, being warmed, and expelled above. 

Do you think we can get any performance assessment with measurements?  They are easy to get from a combustion analyser but usually no one has one.  

If, as I suspect, the air hole is far too large, the efficiency can be increased easily at no additional cost. It is likely that the maximum air hole size should be 40 x 100 mm. 

Thanks for sharing
Crispin


-----Original Message-----
From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Paul Arveson
Sent: Monday, December 05, 2022 7:27
To: stoves at lists.bioenergylists.org
Subject: [Stoves] Stoves for Ukraine?

I attached two photos of a stove being manufactured for Ukraine and distributed by a charity, missioneurasia.org.   This news was sent to me by an old friend and scholar, Prof. John Bernbaum in the US, so I believe it is legitimate.

The appeal states that "The cost to provide one wood-burning stove is
US$250 -- which includes the cost to manufacture, deliver and install the stove along with a 2-week supply of firewood."

Based on the pictures, what do you think of the design and value of this stove?

Paul Arveson