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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Friends<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In the message titled TLUD as a lighting technique for coal stoves there is attached a photo of the real time outputs from a test of the GTZ 7.4 crossdraft coal stove. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It shows two computer screens with the temperatures on the left.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>On the right screen is a grey block with two graphs. The block is a scale reading programme which is available free to anyone for personal use and is well suited to stove development. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Apart from reading the scale, it has simultaneous graphing capabilities. On the top graph the blue line (curve) is the kW output in real time. Also shown is a nearly straight line which is the rate at which the mass burned changes. Note that it is basically a straight line meaning that the power output is constant. This is the advantage given by stoves that burn TLUD, crossdraft and downdraft: continuous heat generation.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The spaghetti underneath is the instantaneous mass burn rate as recorded by the scale. It is auto-scaling so it looks noisier than it actually is.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The programme was mostly written by Jeremy Pemberton-Pigott (Agilent, Singapore). It can be configured in many ways to provide real time measurements and includes auto-saved CSV files, prepend naming and un-losable data because it writes to disk for each reading. The file can be copied during recording and the copy opened if desired. It auto-appends the date and time of the start of saving data and places it in a predefined location. It will work in MS operating systems up to Windows 7 (which we use at SEET in UB as do James and Vinny at the SeTAR Centre in Johannesburg).<o:p></o:p></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Garamond","serif";color:black;mso-fareast-language:EN-CA'><o:p> </o:p></span></p><p class=MsoNormal>It can read any scale that can transmit data continuously over a COM cable (RS-232). The reading rate depends on the speed of the CPU and the COM port. With an Edgeport USB-COM adaptor and an i7 processor it can receive 1 scale measurement per 10 milliseconds. An i5 runs at about a reading per 20 milliseconds. The data stream can either be sampled for ‘n’ readings or continuously averaged for the measurement period (we use 10 seconds to limit the data set size). Data sets can be summed for a print to screen of the rate of change (which we set to once per minute). This appears on the right column of the grey block.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Entering the LHV as received (LHV-AR) of the fuel allows the simultaneous calculation of the stove power and its display on a chart with an auto-ranging axis.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It is fully configurable for serial communication. It can also capture incoming data to find out exactly what text/numbers are arriving and which needs to be stripped from the numbers of interest. The info not needed (non-numbers) is stripped by entering the unwanted info in REGEX format on the CONFIG tab. It has a random number generator to test settings and displays the duration of the test and the number of readings saved on the main tab.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>There is a developers version for capturing crashes or misbehaviour. The current version is 1.74 and is available by email from me. It will arrive on the form of a .bin file which you save and rename to an .exe file.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards<o:p></o:p></p><p class=MsoNormal>Crispin<o:p></o:p></p></div></body></html>