<html><head></head><body class="" lang="en-GB" style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Dear Frank the Patient</div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;"><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">The stoves currently in use are burning everything. The description given by John Davies is apt: a box with a chimney. </div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;">>The fuels you list are very different so do you have several stoves designed to burn each of the different fuels? </span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;"><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;">Well that is the problem: no, there is a single stove. A possible high efficiency option is the use of inserts optimised for each fuel, but they are often burned together. For example people often mix dung and wood. Some efforts have been made to find 'more efficient' stoves which usually means extracting more heat without improving the combustion efficiency. I will check. </span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;"><br></span><span style="font-size: initial; text-align: initial; line-height: initial;"></span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">>The fuels need to be prepared as they are likely going to be on site regarding moisture and size, densified (pellets or pressed into cylinders), split, ground etc. Any process that is likely to take place at the location in prep for the combustion apparatus.</div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">This is how to do a contextual test in a lab. There is no need to drag the lab into the field if you know what they are going to do and use. </div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">The stoves are designed to heat and cook. And bake I think, at least some of them. The major issue I see is they are all similar to the Mongolian baseline stoves, which is to say, copies of a Russian portable wood stove. </div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;">>Only the stoves that can actually use the fuel and expect to do a good job for the task intended. </span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;"><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="font-size: initial; text-align: initial; line-height: initial;">But we already know they are going to use all those fuels. Now what?</span></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br class=""></div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Regards</div><div style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Crispin<span style="font-size: initial; text-align: initial; line-height: initial;"></span></div></div></body></html>