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<span class="">>>A thorough investigation of engineering sources finds no support for rating performance on the basis of any of the energy being subtracted from the denominator, the input energy.</span></div>
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<div class="" style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span class="Apple-tab-span" style="white-space: pre;"></span><b>>[RWL5: What is the name and location of this “<i class="">thorough investigation</i>”?</b></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>ISO TC-285 WG1 (Conceptual Review)</span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>As an ANSI nominated expert you should know that already. Your buddies participated in it. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>As for your favourite formula, the fact that numbers can be placed one upon another does not make the result of the calculation a valid fuel consumption metric. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>If the energy in char is useful, then it is a product of the processing of the fuel fed, in which case it goes in the numerator: char energy over fuel energy. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>Applying your formula to char, it would be </span></div>
<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>Char energy over (fuel energy minus pot energy)</span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>You would get a number, but it is also useless for reporting the char energy as a fraction of fuel energy fed or the char energy production efficiency. It is just a number. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>No publication shows that the WBT thermal efficiency calculation is valid. Using something is not an argument for validity. Copying an error does not correct it. The WBT contains numerous conceptual
errors, and using it does not constitute an argument in favour of any of them. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>The WBT under-reports the fuel consumption of almost all solid fuel stoves if the 'char-deducted' metric is used. In those few cases where there is no char produced the fuel consumption metric
is correct, but not the specific fuel consumption because the fuel mass is divided by the mass of remaining water, not the mass used in the test. </span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>No comparative or absolute performance rating for a stove should be trusted if it was made using the WBT. It rarely reports the actual performance, even on those metrics which are valid. (None
of the low power metrics are valid.)</span></div>
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<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>Regards </span></div>
<div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span>Crispin </span></div>
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