[Stoves] Saving the WBT

[Frank Shields]

Dear Stovers,

 

 

I am trying to determine the best way to calculate the energy in the Natural
Volatiles. The sample we place in the iron pipe of the oven dried biomass we
can test or 'look up' the energy value. In the char remaining after 450c
deg. (char-ash) we can give that a value of 34.78 kJ/g. Then for the total
NV in the fuel we just subtract the total biomass from the char energy
remaining. All done in the pipe. Then use the energy calculated from the
increase temperature of the water to determine efficiency. 

 

I am still wondering what to do with the moisture in the fuel. Any
suggestions?

It is like the NV fraction but with possible varying results. As Alex
reminded me in his writings there is the water-reaction that can increase
the energy output or the LHV stealing energy from the NV. So depending on
the stove and operator working the catalyst to control the internal body
temperature the water can be a plus or minus.  My thinking now is to just
use the dry NV value as the total energy of the biomass. Like playing golf.
You have a par 5 and you can go above or below depending on your day. The
dry NV value is the value we use and we go above or below 100% efficiency
depending on how good the stove and operator controls the catalyst and if
water is included in with the biomass. 

 

>From the replies it's a bit hard to tell but it seems we are mostly all in
agreement. : )

 

Regards

 

Frank

 

 

Frank Shields

Control Laboratories; Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

frank at biocharlab.com

www.controllabs.com

 

 

 

   

 

 

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Ronal W. Larson
Sent: Monday, August 19, 2013 8:15 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Saving the WBT

 

Crispin and list:

 

Crispin and list:

 

   Sorry.  Still not understanding.  Who in the stove business has a problem
with excess air that is too small?  I read about EA ratios of 3, 4, 5.., not
0.3, 0.4, 0.5 ...

 

Ron

 

 

 

On Aug 19, 2013, at 9:06 AM, "Crispin Pemberton-Pigott"
<crispinpigott at gmail.com> wrote:





Dear Ron

 

>I am going to stay away from equivalency ratio until I see some way to use
it.

 

It is used to talk about the air supply when there is no excess air
available. Once EA goes to 0%, how do you describe a further reduction in
the air supply?

 

So that is the use for it.

 

Regards

Crispin

 

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