[Stoves] combustion of char -- spontaneous and dangerous

[Kevin]

Dear Crispin

I don't understand the graph...
1: What are the units of the vertical scale? (Is it Grams weight?)
2: The weight (?) gain is virtually instantaneous.

Presuming the vertical axis is the weight of the stove system and contents in grams, the instantaneous system weight gain would be 108,400 less 103,800 = 4,600 grams.

What could possibly explain such a large and instantaneous weight gain? Did someone simply put more wood or coal on the fire?

Best wishes,

Kevin
  ----- Original Message ----- 
  From: Crispin Pemberton-Pigott 
  To: 'Discussion of biomass cooking stoves' 
  Sent: Monday, February 25, 2013 2:45 PM
  Subject: Re: [Stoves] combustion of char -- spontaneous and dangerous


Dear Friends Here is a mass profile, raw and smoothed with 21 point simple averaging (minus 1000 to pull it down so you can see it).  

  There is a clear sustained increase in the mass after about 800 minutes (readings are per 10 seconds). The jumping around in the middle of the night is, I believe, wind on the chimney. I am quite prepared to believe that the effect of wind might explain 100% of the change in the line, but it is worth looking at the whole fuel composition issue just in case there is something new to learn.

   

  Regards

  Crispin

   



------------------------------------------------------------------------------


  _______________________________________________
  Stoves mailing list

  to Send a Message to the list, use the email address
  stoves at lists.bioenergylists.org

  to UNSUBSCRIBE or Change your List Settings use the web page
  http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org

  for more Biomass Cooking Stoves,  News and Information see our web site:
  http://www.bioenergylists.org/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20130225/8fd99f93/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 43291 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20130225/8fd99f93/attachment.png>