[Stoves] Fuel classification system

[frank]

Dear Tom, and all,
I am still trying to figure out what percent moisture on a dry weight 
basis means?
On the page labeled 'Fuel Moisture' on the download Tom gave us below it 
has the conversion from dry basis to wet bases as follows:

MCwet = MCdry/(1+MCdry)

So if we have a sample with 20 grams water and 80 grams solid we have 
20%moisture on a wet basis.

20 = MCdry / (1+MCdry)

How do you calculate MCdry? My math is real rusty.
And what does the results mean?

Thanks

Frank








Tom Miles wrote:

>Dean,
>
>That's the list I was referring to with the 80 species. The link at UCB is:
>http://ehs.sph.berkeley.edu/hem/hem/protocols/WBT_data-calculation_sheet.xls
>
>If we add density to that list it gives us a better picture of the candidate
>fuel woods for stoves.
>
>I don't know who developed that list but it would be interesting to know why
>they picked the species that they did. As we work down the list we should be
>able to identify the geographical distribution. If the list doesn’t match
>any projects of interest then that's also important to know. 
>
>Tom 
>
>-----Original Message-----
>From: dstill at epud.net [mailto:dstill at epud.net] 
>Sent: Thursday, January 04, 2007 2:26 PM
>To: Discussion of biomass cooking stoves; Tom Miles
>Cc: lists.cedesol at gmail.com; 'Discussion of biomass cooking stoves'
>Subject: Re: [Stoves] Fuel classification system
>
>Dear Tom,
>
>I'm at a strange computer so I can't do it from here but the UCB WBT
>includes a list of woods with their calorific values if you want to look at
>it.
>
>All Best,
>
>Dean
>
>Quoting Tom Miles <tmiles at trmiles.com>:
>
>  
>
>>David,
>>
>>Greetings. Of course we need to identify the brushwoods. There are 
>>families of burshwoods that are pretty commonly used.
>>
>>I looked up your tola (or tolla) and yareta previously. I would think 
>>that a dry yareta would burn something like a crown of turf or moss, 
>>or a loss fill of straw.
>>
>>The UCB WBT spreadsheet has heating values for about 80 species that 
>>someone spend time developing so presumably they cover most species.
>>
>>Tom
>>
>>
>>
>>
>> 
>>
>>  
>>
>>-----Original Message-----
>>From: stoves-bounces at listserv.repp.org 
>>[mailto:stoves-bounces at listserv.repp.org] On Behalf Of CEDESOL 
>>Foundation lists
>>Sent: Thursday, January 04, 2007 11:49 AM
>>To: Discussion of biomass cooking stoves
>>Subject: Re: [Stoves] Fuel classification system
>>
>>Tom Miles wrote:
>>    
>>
>>>Frank,
>>>
>>>Wood is still the reference fuel because it is the most prevalent 
>>>even
>>>      
>>>
>>>though there will be lots of other residues mixed in or there will 
>>>be
>>>      
>>>
>>>areas with mostly dung. You can't find the data if you don't know
>>>      
>>>
>>the
>>species.
>>    
>>
>>>Density is the single most important property of wood that 
>>>differentiates its burning characteristic. You can plot ignition 
>>>time,
>>>      
>>>
>>>the volume burning rate, and percentage left as charcoal all as a 
>>>function of wood density. CO, PM and VOC emissions also appear to
>>>      
>>>
>>vary
>>with density.
>>    
>>
>>>  
>>>      
>>>
>>snip
>>Tom, first off - How is the family?  Happy New Year to you all!
>>
>>How do we figure or take into account native species like Kiswara, 
>>Eucalyptus,  Tola (which is a bush, would that be wood?)
>>    
>>
>>>The next distinction is between wood and non-wood. Grasses and 
>>>agricultural residues including corn cobs and husks have completely
>>>      
>>>
>>different properties
>>    
>>
>>>than wood.   
>>>
>>>  
>>>      
>>>
>>and here is where the walking gets "thicker" - animal dung, which is 
>>relative to what they are grazing on and maybe climate.  Species like 
>>Yareta, which I think is like a liechen, but I've been told it is a 
>>tree (¿), tundra . . .
>>    
>>
>>>If we can identify wood species and characteritics relative to test
>>>      
>>>
>>fuels
>>we
>>    
>>
>>>will have accomplished a lot. Next can look at non-wood fuels.       
>>>      
>>>
>>>Tom
>>>      
>>>
>>saludos
>>D
>>
>>--
>>"We make a living by what we get... we make a life by what we give." - 
>>unknown author
>>
>>David Whitfield V.
>>Executive Director
>>CEDESOL Foundation
>>
>>Alternative Education, Renewable Energy, Social Equality
>>
>>http://www.cedesol.org
>>
>>SKYPE - solar1bol
>>
>>
>>
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>>
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>>    
>>
>
>
>
>
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>  
>

-- 
Frank Shields
Soil Control Lab
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