Dear Dean and All
I must make a correction to one of the numbers in the message below. Thanks Crispin From: Crispin Pemberton-Pigott [mailto:[email protected]] Sent: Sunday, November 25, 2012 5:24 PM >Dear Dean >The tests were performed using the WBT 4: >In this study, twenty-two cookstoves burning six fuel types (wood, charcoal, pellets, corn cobs, rice hulls, and plant oil) at two fuel moisture levels were examined under laboratory-controlled operating conditions as outlined in the Water Boiling Test (WBT) protocol, Version 4. >You said: You can see that fuel use is measured, not assumed, etc. >I beg to disagree. The fuel use is not measured, it is calculated from the energy available from the mass of fuel burned, compensated for unburned char. I have just had confirmation of this from Jim yesterday morning. In other words, he followed the experimental procedure laid down in the WBT protocol exactly. The spreadsheet does not have a place to enter the amount of raw fuel needed to accomplish a cooking task. That is why the results of the Quad 2 stove test (636 dry g) are so different from the actual fuel needed to perform a 5-litre WBT (1318 dry g). [I wrote 1550 because I was from memory. I gave the moist fuel mass, not the dry fuel mass. Apologies to all affected. In other words the error in the stated fuel consumption is 207% not 244%. CPP]
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