Cooling is directly related to the wet bulb temperature of the environment. In Johannesburg South Africa (5000 ft amsl) the design wet bulb temperature is 21oC for day time. The trick is to keep the pot itself in the shade and somewhere where there is at least a small breeze so that fresh air can replace the air around the pot. The air around the pot clearly gains water vapour and its micro climate wet bulb temperature will rise
Rex From: Jason [mailto:[email protected]] Sent: 25 December 2013 11:00 AM To: Discussion of biomass pyrolysis and gasification Subject: Re: [Gasification] [biochar] Pine char gasification Regarding evapourative coolers, 8°C is about the maximum available in a dry climate. About 2°C in my local temperate climate and very little if any in a hot humid one I would think. This I learnt from someone in a position to know :-) Regards Jason On Wed, Dec 25, 2013 at 5:00 PM, Jeff Davis <[email protected]> wrote: I'm sure this is not the case but a refrigerator can be made from two clay pots, one smaller than the other, charcoal and a cloth top. The smaller pot fits inside the larger one with charcoal (or sand) betwixt them. Add water to the charcoal and cloth plus evaporation. I also doubt that it would work in the steamy jungles. Just thought I'd toss that out there. http://www.youtube.com/watch?v=ZNKifJHqScc Marry Christmas, Jeff On 12/24/2013 02:52 PM, Ronal W. Larson wrote: I hope someone on this list has looked at efforts to mimic the Terra Preta soils. It seems clear they did much more than just put out ash - which seems to have been what the vast majority of aboriginal slash and burn cultures did. I favor an argument that the char came from what happened during and after cooking (If wood is easy to come by, you can make a lot of char in a 3-stone arrangement. I have seen one argument for an approach like HTC. _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg ylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com
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