[Stoves] Gas Sensing

[Lanny Henson]

Thanks Chris,
That was 80 cu meters, not cu ft, my error.
So if it only takes 7.62 m^3 / 1 kg wood,, I would need about 4 cu meters 
for 1/2 kg of wood?
Lanny

----- Original Message ----- 
From: "Chris Roden" <croden at uiuc.edu>
To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
Sent: Saturday, February 09, 2008 6:55 PM
Subject: Re: [Stoves] Gas Sensing


> Lanny:
>
> 80 ft^3, That's a pretty small room 4 feet x 4 feet x 5 feet - how is the 
> cook going to fit in there?
>
> I get about:
> 7.62 m^3_air / 1 kg_wood
>
>
> Here are the numbers I used:
> Wood =
> C5H7O3 or
> CH1.4O0.6
>
>
> C5H7O3  +  5.25 O2  =>  5 CO2   +   3.5 H20
>
> 168 g O2 / 115 g wood
>  or
> 1.46 kg O2 / 1 kg wood
>
> By mass 23% of air is O2
> 230 g O2 / 1000 g air
>
> Air density: 1.2 kg_air/m^3 (20 deg C, 1atm)
>
> So start with 1 kg of wood:
> 1 kg_wood  * ( 1.461 g_O2 /  kg_wood )   *   ( 1 kg air / 0.23 kg O2)  * 
> ( 1 m^3 / 1.2 kg_air )  =
>
> 7.62 m^3_air / 1 kg_wood
>
>
> Hope this helps - you better build a bigger kitchen!!
>
> Chris R.
>
> ---- Original message ----
>>Date: Sat, 9 Feb 2008 12:57:28 -0500
>>From: "Lanny Henson" <lannych at bellsouth.net>
>>Subject: Re: [Stoves] Gas Sensing
>>To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
>>
>>I have 80 cubic feet of room and I want to burn 500 grams of oak.
>>What percentage of the 02 will be converted assuming  there is good
>>combustion?
>>Will I have enough 02 as to not effecting the dynamics?
>>The exhaust will rise and the fresh air will stay low so the stove may be
>>able to pick up fresh air through most of the burn.
>>If that does not work, I will pipe in fresh combustion air, and let some 
>>air
>>exhaust at the lowest point.
>>Lanny
>>
>>----- Original Message ----- 
>>From: "Steve Taylor" <Steve at thetaylorfamily.org.uk>
>>To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
>>Sent: Saturday, February 09, 2008 8:01 AM
>>Subject: Re: [Stoves] Gas Sensing
>>
>>
>>> Lanny Henson wrote:
>>>> LH- I like this idea, I am also planning to set up a sealed room to 
>>>> test
>>>> stoves. I was planning to do a complete test burn inside a sealed room
>>>> with
>>>> a known volume and then check the gas levels.
>>>>
>>>>
>>> How realistic can that be ? As the O2 burns the whole dynamics of the
>>> burn are likely to be altered, if the room is small enough to have a
>>> significant change in gas ratios.
>>>
>>> Steve
>>>
>>>
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>>
>>
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