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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoPlainText>Dear Dung Burners<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Attached is a photo of the Caritas Model TJ 1B which is a brick-lined metal shell. It cooks one pot (pot holes are indicated by the 'B' designation) and it does not have a gas-to-air heat exchanger, which is the Model 1.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>This layout with 4 bricks on the floor and 4 soldiers on each side, with a single brick forming an end to the chamber proved to be very easy to build, very cheap to manufacture and capable of cooking with dung alone.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>In the southern areas of Tajikistan it is common to co-fire wood and dung. This requires at least some wood or other biomass to add to the fire every now and then. The added material helps maintain a fire hot enough to burn out the dung char which is otherwise lost, particularly near the end.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The emissions of this stove fuelled by dung alone appear similar to the traditional stove burning wood, which is to say a greatly reduced amount of smoke. The CO/CO<sub>2</sub> ratio was in the range of 2-3%, considerably better than the baseline and the ‘baseline improved stove’.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The application of the stove is to heat a chimney as well as cook. That is why there is no heat exchanger on the end to directly heat the room the stove is in. This is a common feature of homes: passing a hot chimney through one or more rooms.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The heating efficiency and more detailed emissions will appear in a later communication.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The stove can be sold without bricks as it accepts local low cost clay bricks, local face bricks, and the high quality stove combustion chamber bricks used in permanent home heating systems. Those high quality bricks are available second hand (3 Somoni each) or new (10 Somoni each). 7.8 Somoni = $1.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The stove uses 13 bricks. The Model 1 is available without and without the cooking hole: Models TJ1A and TJ1B. It is expected the stove shell without chimney will cost under $25. Buyers can add their own bricks and change them later for high quality furnace liners.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Options include a re-bar grate for use with burning dung alone (not required if co-firing) and a drop-on water heater to either heating a water tank or supplying hot water to one or two radiators. They can be purchased individually.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The water heat exchanger (attached) has a heating power of 350 Watts per 10 cm of height. It forms part of the chimney. The one in the photo is 90 cm tall with an I.D. of 73mm. The O.D. is 14 cm.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Regards<o:p></o:p></p><p class=MsoPlainText>Crispin<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p></div></body></html>