https://wiki.opensourceecology.org/api.php?action=feedcontributions&feedformat=atom&user=NT 2026-05-13T21:11:03Z User contributions MediaWiki 1.39.13 https://wiki.opensourceecology.org/index.php?title=Talk:Vinegar_as_herbicide&diff=11913 2010-03-19T12:40:41Z

<p>NT: Safety</p> <hr /> <div>==Safety==<br /> Acetic is one of the milder acids. For a little perspective, drops of glacial acetic on the skin for minutes cause no visible damage, though it does attack the skin to some degree.<br /> [[User:NT|NT]]</div>

NT https://wiki.opensourceecology.org/index.php?title=Batteries&diff=11912 2010-03-19T10:42:53Z

<p>NT: Lead acid</p> <hr /> <div>50+ year battery consisting of nickel and iron plates in an electrolyte of Potassium Hydroxide (similar to lye - which I'm guessing you could substitute). <br /> <br /> Thomas Edison drove an electric car a hundred years ago.<br /> The batteries he used are easy to build and are still operational.<br /> Search for 'nickel iron battery', 'edison cell' or 'nife battery'.<br /> See http://www.beutilityfree.com/content/<br /> I have a document on how to build one I need to dig up.<br /> <br /> <br /> ==Lead acid==<br /> Lead acid cells are easy to make too. <br /> http://wiki.diyfaq.org.uk/index.php?title=Lead_acid_battery_construction<br /> [[User:NT|NT]] 10:42, 19 March 2010 (UTC)</div>

NT https://wiki.opensourceecology.org/index.php?title=Talk:Electric_Motor_Generator&diff=11911 2010-03-19T09:52:54Z

<p>NT: Cheaper to buy</p> <hr /> <div>==Cheaper to buy==<br /> Assorted motors can be bought in bulk as scrap items from garbage disposal facilities. In my limited experience most of them work ok. I forget exactly but basically you're looking at around scrap value. One batch of motors should keep a community going a long time.<br /> <br /> Here...<br /> http://www.recycleinme.com/search/selloffers__motors.aspx<br /> <br /> Another possibility is to accept scrap items from households locally. Either way it should be entirely practical to skip motor production.<br /> [[User:NT|NT]] 09:52, 19 March 2010 (UTC)</div>

NT https://wiki.opensourceecology.org/index.php?title=Talk:Solar_Combined_Heat_Power_System&diff=11910 2010-03-19T09:46:57Z

<p>NT: more loss</p> <hr /> <div>The efficiency computation is completely wrong!<br /> <br /> Claiming 90% turbine efficiency will completely discredit the project in the eyes of experts. What about Carnot efficiency? What is the working temperature?<br /> <br /> From real engineering computations and what I know about Tesla turbines, you will be happy if you can get 10% heat-to-mechanical work efficiency. Anyway, don't expect much more than that for small installations.<br /> <br /> For a prototype, I will give you all the quality credit if you can get 5% global heat-to-electricity efficiency.<br /> <br /> Also, the collector efficiency estimation is too optimistic. There are also mirror reflectivity loss (15%), interception factor loss (depending on the optical precision), endloss (depending on geometry and orientation), cosine loss (depending on orientation and location). You will get bad surprises when you realise the project!<br /> <br /> [[User:Azuredu|Azuredu]]<br /> <br /> <br /> and loss from dirt on the reflectors and glazing<br /> [[User:NT|NT]] 09:46, 19 March 2010 (UTC)</div>

NT