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Weary | 26/11/2013 13:08:43 |
421 forum posts 1 photos | I too would like to read the 'Calculations Applicable to Boiler Design' article. I am also one of the readers who found the 'Locomotive Springing, Adhesion and Pulling Power' article interesting - if in some parts a little challenging - but I survived! Regards, Phil Roe |
Geoff Theasby | 26/11/2013 14:35:11 |
615 forum posts 21 photos | I found the article on combustion very interesting. I am intrigued that whole books have been written about it. I have one question. The author assumes that the Nitrogen in the air passes through the combustion process unaffected. 5N2 in equals 5N2 out. Is this just for propane or other similar gases, because in a car engine, which may run on such gases, you get Nitrogen oxides out as well. This is why modern cars have complex fuel injection and catalytic converters. I know petrol and diesel are more complex chemical mixtures than just propane, and that emissions are reduced if you use LPG, but they are still there. I realise that these matters may have been omitted for simplicity, but perhaps it should have been acknowledged? Regards Geoff |
Stub Mandrel | 26/11/2013 21:26:36 |
![]() 4318 forum posts 291 photos 1 articles | Hi Geoff, The amounts of nitrogen & sulphur compounds are negligible in terms of the thermodynamics, although they make measurable contributions to gross pollution - mainly because they are much nastier than CO2. One curious fact I remember from chemistry classes many years ago is that the calorific content of hydrocarbon fuels is almost identical, regardless of the actual composition. Edit: LPG is virtually sulphur free, produces less soot (PM10s) and only 80% of the CO2 of petrol/diesel. Neil <lpg driver> Edited By Stub Mandrel on 26/11/2013 21:33:16 |
davidk | 27/11/2013 09:50:00 |
60 forum posts | I too would like to say congratulations to Diane and your team for an excellent ME 4470. I found the two technical articles to be most interesting and informative. After all, that is why I buy Model Engineer, to learn something! Any information that helps me become better at model engineering is most welcome on my part. Regarding the article on boiler design; Like many others, I never expect to design a boiler, but would be most interested in reading that and other future technical articles. Definitely the way to go! Regards David |
David Hanlon | 27/11/2013 12:08:59 |
40 forum posts | Thanks Diane, this issue restores my faith in Model Engineer by actually including some Engineering (i.e. design relevant) articles. Looking forward to a boiler design article and (perhaps) other technical articles? I may never design a locomotive, ic engine or any other model engine, but as an engineer (sadly in the wrong discipline) it is great to see how they actually work under the skin. BTW don't diminish the 'how to' and construction articles - I have laid aside my soldering iron and started work on a (probably badly constructed!) Emma Victoria - learning an entirely new skill set. Keep up the good work. Dave |
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