<html><head></head><body class="" style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br>Dear Frank</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div id="_originalContent" style=""><div><blockquote type="cite" class=""><div><span style="line-height: initial;">>Agree but because of the temperature settings I always questioned. I’m thinking if we use it to compare stoves we can’t have one lab boiling water at 95c and another boiling at 100c due to location. </span></div></blockquote><div>Remember that all we are doing is reproducing the burn cycle of some proxy meal or meal combination. The temperature is actually not very relevant to determination of performance. It is delta T and the mass involved. The errors on the theoretical side are very small. <span style="font-size: initial; line-height: initial; text-align: initial; color: rgb(31, 73, 125); font-family: Calibri, 'Slate Pro', sans-serif;"></span></div><div><br class=""></div><div>>I’m thinking to standardize the test a head pressure could be stated where water is overflowing to keep the head (and flow) constant and the same for all labs. </div><div><br></div><div>This is simply not necessary. You could have varying flow if you want. In the SEET lab the flow varies all the time and is recorded far more accurately than I thought was going to be possible. Less than 1 cc per second. </div><div><br></div><div>>Is head pressure influenced by altitude? </div><div><br></div><div>Makes no difference. The specific heat of water is not going to be affected by altitude. </div><div><br></div><div><span style="line-height: initial;">...I predict, much better because of more controls over the experiment. </span></div><div> </div>If you are making the right measurements there are many controls that can safely become variables. <br class=""><blockquote type="cite" class=""><div class=""><div style="background-color: rgb(255, 255, 255); line-height: initial;" class="">
<div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);" class=""><span style="font-size: initial; text-align: initial; line-height: initial;">></span><span style="font-size: initial; text-align: initial; line-height: initial;">So the 4.186 value is the same going from 1c to 2c as it is going from 88c to 89c? That is the energy required to increase a gram of water 1c at any liquid temperature? I am just making sure. </span></div></div></div></blockquote><div>It is not exactly the same but doesn't move much. It is in the fourth significant digit. What else do you have with four significant digits?<span style="line-height: initial;"></span></div><blockquote type="cite" class=""><div class=""><div style="background-color: rgb(255, 255, 255); line-height: initial;" class=""><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="line-height: initial;">>i have tried this a few times with always a kink - your work looks really good. I like glass. </span></div></div></div></blockquote><div><span style="line-height: initial;">The thin wall tubing is pretty difficult to bend smoothly around a small radius. I had to practise. The outer shoe of the tool has to be very smooth, the inner shoe not, and the two together have to fully enclose the tube. As purchased the two didn't close fully. </span></div><div><span style="line-height: initial;"><br></span></div><div><span style="line-height: initial;">We filled one tube with sand as that worked well on a test piece but wasn't used in the end. </span></div></div><br><!--end of _originalContent --></div><div id="_originalContent" style="">Regards </div><div id="_originalContent" style="">Crispin </div></body></html>