[Stoves] Specific heat capacity/ Stove preformance data

[Lanny Henson]

>Then use as your triplicate three tests like that in a row. There is month 
>need to measure the char mass until the very end

Crispin, Sarbagya
Is that 3 sets of  3 test or 3 test total?
How much water should be tested in a 40 liter/60/80/100 liter pot? 35 liters 
is about all you can cook in a 40 Qt? would about 90% full ok? that would be 
36 liters in a 40 liter pot.
Sarbagya, how much are you using?
Lanny



----- Original Message ----- 
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: "Stoves" <stoves at lists.bioenergylists.org>
Sent: Tuesday, August 13, 2013 8:30 AM
Subject: Re: [Stoves] Specific heat capacity/ Stove preformance data


> Dear Sarbagya
>
> Thanks for that clarification.
>
> Please run a test that uses the leftover char from a previous run. That 
> represents reality. Then see if you get about the same amount of char 
> remaining the second time.
>
> Let's assume you do.
>
> Then use as your triplicate three tests like that in a row. There is month 
> need to measure the char mass until the very end.
>
> The 'fuel consumption' is the amount of new raw fuel needed for each 
> replication.
>
> The char is always fed into the subsequent fire.
>
> The energy available in the raw fuel is the energy consumption. It has to 
> be compensated for moisture or course.
>
> Testing in this manner is 1) easier than a WBT, 2) more accurate than a 
> WBT, 3) closer to actual behaviour and 4) automatically deals correctly 
> with the char energy is it is removed from the process either because it 
> can't burn in the same stove or because it was withdrawn for other 
> purposes. As long as there is no excessive char accumulation in subsequent 
> tests you don't even have to weigh it or worry about its actual heat 
> content. Either a stove can burn it or it can't and the 'consumption' is 
> the raw fuel that has to be added for each replication - only.
>
> I am interested to know the difference in numbers if you do this.
>
> You should of course divide the fuel energy by the number of litres of 
> water boiled based on the initial mass, not the final mass because missing 
> water was of boiled (evaporated). The effect is a few %. Always express 
> the efficiency in terms of energy in and energy transferred (work done).
>
> Regards
> Crispin
> From BB9900
>
> -----Original Message-----
> From: "Sarbagya R. Tuladhar" <sarbagya007 at gmail.com>
> Date: Tue, 13 Aug 2013 17:44:45
> To: <crispinpigott at gmail.com>; Discussion of biomass cooking 
> stoves<stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Specific heat capacity/ Stove preformance data
>
> Hi Crispin,
>
> Yes, the charcoal remaining is subtracted from the initial amount of wood 
> used.
>
> The stove even though can burn that char (we have done that numerous 
> times) however for lab tests we throw it away and start with a fresh 
> batch. The consistency in the tests are hence maintained. The wood species 
> we use for our purpose is Casuarina with an energy value of 20,790 kJ/kg.
>
> Cheers
>
> Sarbagya
>
> On 13/08/2013, at 5:13 PM, Crispin Pemberton-Pigott wrote:
>
>> Dear Sarbagya
>>
>> Are you deducting charcoal remaining as 'wood not consumed' in that 
>> calculation?
>>
>> If you are, can the stove burn that char on the next run or is it thrown 
>> away?
>>
>> Please everyone note that we can't tell the real energy efficiency if we 
>> do not know the heat content of the mass of fuel. It is most helpful if 
>> the reported figure is 'the energy needed to perform the task' not the 
>> mass of fuel. We don't all use the same fuel - in fact we can all use 
>> different fuels if we report energy instead of mass.
>>
>> Thanks
>> Crispin
>> From BB9900
>>
>> -----Original Message-----
>> From: "Sarbagya R. Tuladhar" <sarbagya007 at gmail.com>
>> Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
>> Date: Tue, 13 Aug 2013 14:02:30
>> To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
>> Reply-To: Discussion of biomass cooking stoves
>> <stoves at lists.bioenergylists.org>
>> Subject: Re: [Stoves] Specific heat capacity/ Stove preformance data
>>
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