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Tori

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Reply with quote  #41 
I'm a big fan of Dupli-Color paints.   But maybe a BBQ Black would be best ?

stmbtwle

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Reply with quote  #42 
I use high-temp flat black for BBQs.
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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #43 
I cannot find much in the way of LRV online. Every Dupi-Color high temperature paint I look at is glossy. Flat is better the glossy.  Best thing I have come across yet is Rust-Oleum High Heat Flat Spray Paint, lots of retail boxes carry it, Walmart, Home Depot, Menards, True Value .. ect. However digital cameras and a computer monitors don't have a good track record with accurate color representation. Your need to look at the color when you buy.

Rick H Parker



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Rick H Parker

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Reply with quote  #44 
The BBQ paints are good to 1200F, The high temperature paints are good to 500F.  Either one should stand up to the heat of a solar collector.

Rick H Parker

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Rick H Parker
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gbwillson

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Reply with quote  #45 
I couple of years ago tested several different brands of flat black paint and the one that was clearly the darkest surprisingly didn't perform the best. While I think almost any paint will work, some have better coverage and stick better, to more surfaces than others as they don't require a primer. Cheap spray paint is cheap for a reason and will cost you $1, but even the best brands might only cost $4 and perform SO much better overall. The price of paint is certainly not a significant outlay of money in the overall cost of materials. I tend to paint the larger areas of my collector box with a quart or gallon of flat black as I can roll and brush it on quickly, evenly, and is cheaper than using several spray cans. Surfaces that directly transfer heat to the air or liquid I spray as thin of a coat of spray paint as possible to maximize heat transfer.

The results of my testing linked below show the Krylon is the winner, and the $.99 paint the loser, but the difference was only about 10˚F over the cheap paint and 5˚F over the other quality paints. Still, that difference and any other small improvements in either the build or design can add up to better performance. And notice how much darker the high-temp paint is than the others, but wasn't the best performing. 

http://simplysolar.supporttopics.com/post/paint-performance-6548856?&trail=10

And a couple of things about the need for high-temp paint. Some high-temp paints require you to "cure" them at high temps that you are unlikely to see in a collector unless it stagnates. Which brings me to my second point... A collector should never be operated at a temp were a standard latex paint would begin to fail or cause problems. Mostly it's only a matter of wasted energy and poor efficiency. And if the temps inside the collector are high enough for concern, the paint used isn't the only material used that could be affected.

Greg in MN
Tori

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Reply with quote  #46 
Getting back to this,.... i need some advise on finding a pump.   Not concerned right now with one that'll lift 15',  but i do need it to be 120v    Either that, or i have to figure out a way to put a DC pump on a timer.

Anyone with some recommendations ?
stmbtwle

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Reply with quote  #47 
For 120v look into "pond" or "fountain" pumps.  Available in many sizes at most big box stores.  They're a brushless, seal-less, water-lubricated pump with no moving parts other than the rotor/impeller.  Windings are potted in epoxy so they'll run just about forever.  About the only thing that will damage them is trash in the plastic impeller, but you can get replacement impellers for most of them. Submersible too though I don't install mine submerged.  No temperature rating on them but mine can handle the 160F water storage temperature with no problem.  NOT self-priming.

AC or DC a temperature-differential controller or a snap-disk switch might be better than a timer. The differential controller is probably best but more expensive, too.  


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Tori

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Reply with quote  #48 
Thoughts on this pump : http://www.ebay.com/itm/1200-4200GPH-Submersible-Inline-Pond-Pump-Aquarium-Fountain-Waterfall-Koi-Filter-/262192577190?var=&hash=item3d0be53aa6:m:mZ42yrvOPlwkjRuw60t9a8g

This looks good to me, i like that it is adjustable but wondering about being able to adapt the fittings down to 3/4" range....
stmbtwle

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Reply with quote  #49 
Two problems I can see. You only need 350-500 gph if that. You also need a pump with INLET fittings. Some do, some don't, and I didn't see any mention of them. You could simply drop the pump in the hot tub but I don't think you'd be happy. The "Ecoplus" pumps come with inlet fittings and are available in several sizes.

https://www.amazon.com/EcoPlus-728310-Fixed-Submersible-Inline/dp/B0018X2XT4/ref=sr_1_1?ie=UTF8&qid=1491523476&sr=8-1&keywords=ecoplus+pump

The strainer comes off and you screw in the appropriate hose adapter. You can also use cpvc fittings of the appropriate size. Hose is easier to disassemble though.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Tori

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Reply with quote  #50 
I agree with the fittings part.  That'll be another chore.   Price seems fair, and i should be able to use this pump when i move things to the roof. 

I'll keep shopping.
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