[Terrapreta] heat energy: stoves vs. thermo biopiles

[mmbtupr at aol.com]

from  Lewis L Smith

In my recollection, the test result was called "oven dry", because the 
laboratory oven used purposefully extracted only the extracellular 
moisture, not the intracellular moisture, in order not to vaporize any 
of the residual. So the "oven dry" residual actually was only 94% dry. 
That is, its H2O content was 6%.

Cordially. ###

-----Original Message-----
From: Sean K. Barry <sean.barry at juno.com>
To: jeff0124 at velocity.net; terrapreta <terrapreta at bioenergylists.org>
Sent: Sat, Nov 24  1:52 AM
Subject: Re: [Terrapreta] heat energy: stoves vs. thermo biopiles

Hi Jeff,
 
Yes, I think you are right.  The lower heating value (LHV) is used
versus the higher heating value (HHV) because there is usually energy 
lost in
driving water out of the feedstock before any energy can be used from 
the
combustion.  This assumes that 100 C heat is not usable.  However, if
there is a use for relatively low quality heat (e.g. green house 
warming in cold
climes), then 100 C might be usable. 
 
Also, if a feedstock is dry then the LHV and HHV are closer in
practice.  The HHV is, I believe, actually measured as heat generated 
from
the combustion of "bone dry" (0% moisture content) feedstock.
 
Regards,
 
SKB

  ----- Original Message -----
  From: Jeff
  Davis
  To: terrapreta
  Sent: Friday, November 23, 2007 8:16
  PM
  Subject: Re: [Terrapreta] heat energy:
  stoves vs. thermo biopiles

Dear All,

When one burns fuel, for the most part, you
  use the lower heating value of the
fuel.


Jeff



On
  Friday 23 November 2007 3:06 pm, Sean K. Barry wrote:
> Hi
  Gerrit,
>
> I suspect its 80% of the released heat, not 80% of the
  combustible energy
> in the biomass feed.  Capturing 80% of the
  combustible energy is about as
> good as any complete combustion
  (burning) process could ever do.  That
> would leave just
  ash.  It even 25 or 30% of the original carbon is left in
> the
  biomass, then this constitutes at least 60% of the energy content of
>
  the feed also.  I'm sure the total energy harvest efficiency from
  making
> compost is much much lower than 80%.
>
> Compost
  does make better fertilizer, to be sure, than charcoal does, even
> low
  temperature charcoal.  It has been suggested more than once on
  this
> site that charcoal could be combined with compost to make a soil
  amendment
> which is initially more fertile than fresh
  charcoal.
>
> Regards,
>
> SKB
>  
  ----- Original Message -----
>   From: Gerald Van
  Koeverdenmailto:vnkvrdn at yahoo.ca>
>  
  To: jeff0124 at velocity.net>
>  
  Cc: terrapretamailto:terrapreta at bioenergylists.org>
>  
  Sent: Friday, November 23, 2007 12:19 PM
>   Subject:
  [Terrapreta] heat energy: stoves vs. thermo
  biopiles
>
>
>   Jeff,
>
>  
  I like the idea of hyour thermo biopile.
>
>  
  Composting to produce energy definitely has the advantage
  of
>   producing a much better fertilizer- the compost - than
  ash from
>   burning.  But it seems that less total
  energy is available by
>   composting, though if the biomass
  had to be dried before burning, the
>   resultant net energies
  might be conquerable?
>
>   A company in Canada (Global
  earth Services/Products) sells a compost-
>   maker with a
  built-in heat exchanger.  They claim to capture 80%
  of
>   the energy.  I interpret this "80%" to be 80% of
  what would be the
>   combustible
  energy.
>
> 
> http://www.globalearthproducts.com/heat_extraction.htm
>thproducts.com/heat_extraction.htm>
>
>  
  Gerrit
>
>   On 23-Nov-07, at 12:34 AM, Jeff Davis
  wrote:
>   > Dear All,
>  
  >
>   > Right now all my time is going into the Thermo
  Biopile:
>   > http://www.puffergas.com/pile/pile.html
>  
  >ile.html>

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