Nicola Woelfe wrote:Hello all!,
A belated but warm thank you to everyone for responding. I am sorely tempted to purchase the Dankoff Slowpump 1322-24 24VDC surface pump... even if it doesn't work for the full 15-20 years, I will have saved money if it works for more than 7 years at the rate the shurflo pumps are failing on me.
I would love to hear why people recommend a slowpump over dankoff's other models. Does anyone have a recommended source for reading more about those pumps? Most of what I find about them is from people who sell them which is not the way I like things when I go to make a big purchase.
Thank you so much for your help!
Eric Hanson wrote:S Bengi,
For high temperature heat storage and heat transfer, molten salts are very hard to beat. I am curious about the overall efficiency of this system as each step in the process loses a portion of the overall energy so I am intellectually interested in how much energy the system delivers compared to how much it receives. Also, over time the hot side will cool over time and the cold side will warm. But over short time spans (such as overnight heat storage, maybe even a couple of days depending on power needs and circumstances) this setup could have real potential.
Extremely cool idea though. I did my masters research in the history of energy and I am starting to contemplate going for my PhD in the history of energy and by now I have an almost unhealthy fascination with all things energy. I now see energy everywhere. I see it in my coffee in the morning, sunshine streaming into my windows in the day, my Christmas tree—EVERYTHING! I especially like new forms, sources, methods of generating and storing energy.
If I don’t stop now, I will ramble on incessantly so I will conclude by saying again, very cool and you have piqued my interest.
Dillon Nichols wrote:You may want to be a bit more specific, what size, chemistry, and application do you have in mind?
I have a set of 8 Sinopoly 400AH LiFePO4 cells, but have only had them 3 months; much too early to say that I'm happy.
Getting satisfactory connections has been a bit problematic. The bus bars as included were of a length that only worked for half the connections; the cells are 'packaged' in pairs with metal strapping, and bus bars only fit the strapped pairs, not between the pairs.
I made my own bars for the other connections. So far things are working fine after retorquing twice, but as I am still waiting on my inverters there has never been a heavy load to tax the connections.
Documentation was very sparse. Warching voltages approaching full charge, a couple cells are obviously the weakest link.
I bought through a localish reseller, so can't comment on the direct purchase experience.
julian Gerona wrote:
Orin Raichart wrote:Both Debi and Frank are right on. There are only two items I didn't notice in their posts:
-for convection flow to work you need atleast 18 inches or 45.72cm height difference (which you will get when you angle the collectors);
-many hot water systems using convection flow will not work if there is an air pocket trapped in the pipes/collectors connected to your tank.
I agree I dont see a thermosiphon here. its natural convection flow. thermosiphon works by alternately heating and cooling a vessel full of air. this advice is correct except that height difference does no determine angle of inclination. Ideally your angle should follow the sun but not less done 30 degrees.