Hi Crispin, So at the end of test 1, I would collect the left over char and use it for the second test. Say for eg. my initial amount of fuel used for test 1 was x kg and the char remaining was y kg. Then for the 2nd test, I would use the y kg. of char + a new amount of fuel to bring the amount of fuel to x kg ? Then check if I am getting the same amount of char the second time. Then continue the same for the third test.
Will do that and get back to you on this. FYI, the tests I had conducted was using the BIS protocol. Thanks, Sarbagya On 13/08/2013, at 6:00 PM, Crispin Pemberton-Pigott wrote: > 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 the same stove or because it was withdrawn for other purposes.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 >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://stoves.bioenergylists.org/ >> >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://stoves.bioenergylists.org/ >> > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/ > _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
