<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><style> body { font-family: "Calibri","Slate Pro",sans-serif,"sans-serif"; color:#262626 }</style> </head> <body lang="en-GB"><div>Dear TLUD Lovers</div><div><br></div><div>Part of the last three week sojourn in Central Asia was spent developing products for Caritas in Tajikistan which is being assisted because they have production and dissemination capacity but not many products. </div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">This simple TLUD made from half a metre of 8" diameter district heating pipe. It runs very well using the 'better' Kyrgyzstani coal though it is not clear which source that means. It is said to be better than the coal available from the edges of a mine near Muminabad (which is mostly rock). </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">This stove is intended to produce a hot exhaust that can be directed into a water heater, a gas to air heat exchanger or a length of horizontal and vertical chimney pipes. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">You can see the secondary air holes. They are 1/2" and there are seven of them. The Excess Air level is about 50% and once hot, the CO/CO2 ratio disappeared off the chart, 0.0000. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">The outside temperature in the centre of the height rises to about 540 C once the pyrolysis layer passes by. This gives it a heating efficiency of about 50% without applying any of the stack heat to another task. To bring this number down and send more into the axhause it would be necessary to place some sort of ceramic lining in the chamber. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">Locally available high temperature bricks are perfect for this but would need to be placed into a 12" pipe, with an 8" chamber. The bricks are $0.40 each second hand. They were easy to cut using an angle grinder with a 230mm diameter stone cutting disk. They were used on another refuellable stove, not this one. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">The retail price of the TLUD is estimated to be $32 at this time. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">The burn time is 4 hrs on high and 8 hrs on low, with a complete burnout and cool down taking 15 hrs if operated on low, as happens through the night. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">It is highly suited to heating water and stones in a sauna so one was also made in Bishkek as a demonstration of how to burn coal hot and without smoke. About one third of homes have such a sauna (hot water, shower and actual sauna) in Kyrgyzstan. </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;"><br></span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">Regards </span></div><div><span style="font-family: Calibri, 'Slate Pro', sans-serif, sans-serif;">Crispin </span></div></body></html>