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" <[email protected]>
To: "Stoves" <[email protected]>
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can't burn in the same stove or because it was withdrawn for other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" <[email protected]>
Date: Tue, 13 Aug 2013 17:44:45
To: <[email protected]>; Discussion of biomass cooking
stoves<[email protected]>
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" <[email protected]>
Sender: "Stoves" <[email protected]>
Date: Tue, 13 Aug 2013 14:02:30
To: Discussion of biomass cooking stoves<[email protected]>
Reply-To: Discussion of biomass cooking stoves
<[email protected]>
Subject: Re: [Stoves] Specific heat capacity/ Stove preformance data
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