Hi Crispin, In answer to your questions. I assumed that the cost of transportation, for bulk products like this will primarily be based on weight rather than volume. Therefore, in my analysis, the relative costs for transporting each of the different fuels is simply the product of:
1. the relative energy density (MJ/KG) multiplied by 2. the relative haul distance.(KM/MJ) to pick up a MJ of fuel. Sized & dried biomass (whether pellets, crumbled wood, dried chips, sticks, etc) has only 59% of the energy density of charcoal. On the other hand, the relative haul distance for traditional charcoal, because the process is so inefficient and it consequently has to be hauled from a much wider area, is 3 times more than for sized & dried biomass. For the "alternative to charcoal" I assume that the market for this fuel being brought into the cities is developed on the basis of modern/new micro-gasifier / TLUD type stoves. It's assumed that the char is either burned in the TLUD (a few designs are coming out with this now) or the char is burned in a separate stove. I have assumed that this TLUD / Char Burning together has an overall efficiency of 40%. - Paul Date: Thu, 18 Apr 2013 11:22:53 +0000 From: [email protected] To: "Stoves" <[email protected]> Subject: Re: [Stoves] Alternatives to charcoal - transportation & biochar Message-ID: <798760741-1366284175-cardhu_decombobulator_blackberry.rim. [email protected]> Content-Type: text/plain Dear Paul M Could you please clarify two things (I can't see the slides. I am in transit). Are you basing the transport on a volume basis on the assumption that a vehicle bearing a higher density fuel can carry more? Someone was talking like that. Next, I think you can (very) safely assume that any charcoal stove will deliver 1.5 times as much heat per available MJ into a pot. I aim higher than that but let's stick to average mediocre wood and charcoal stoves. A pretty ordinary charcoal stove will deliver 40% of the energy available to the pot. I don't know how that affects the outcome but it is the reality re the processed v.s. unprocessed fuels (char vs wood). Thanks Crispin Sent from my BlackBerry device on the Rogers Wireless Network -- Paul M. Means Research & Testing Manager Burn Design Lab (253) 569-2976 (mobile) http://www.burndesignlab.org/ “In the whole of world history there is always only one really significant hour – the present…If you want to find eternity, you must serve the times.”* - *Dietrich Bonhoeffer www.burndesignlab.org <http://www.burndesignlab.org./>*.* *This e-mail and any attachment contain information which is private and confidential and is intended for the addressee only. If you are not an addressee, you are not authorized to read, copy or use this e-mail or any attachment. If you have received this e-mail in error, please notify the sender by return e-mail and then destroy it. *
_______________________________________________ Stoves 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/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
