[Stoves] Last? Alternative to Charcoal

[Paul Means]

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: crispinpigott at gmail.com
To: "Stoves" <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Alternatives to charcoal - transportation &
        biochar
Message-ID:
        <798760741-1366284175-cardhu_decombobulator_blackberry.rim.
net-357301314- at b5.c10.bise6.blackberry>

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/
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