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Old 10-23-12, 05:41 PM   #11
Mikesolar
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The pics look good. I will post some on a build thread when I am up and going. Industry standard for fins, copper or aluminum, is between .3 and .4mm and 150mm wide between tubes. The manufacturers base the thickness and spacing on the time it takes the heat to move from the fin edge to the tube and, as pointed out, aluminum does not have the conduction of copper so an aluminum fin will be closer to .4mm and copper closer to .3mm for roughly the same heat transfer.

I have a roll of Bluetec absorber (good for about 28 panels) from Germany for an ultrasonic welder I bought years ago. It is still sitting on the skid. At the time, it was the most efficient absorber on the market and I don't think there has been much progress since. It is hard to beat 96% absorption and 5% emission.

If you have more panels to build, I would recommend buying a can of Solkote II made in New jersey. It has a very high absorption at about 95% and emissivity of around 20% but the main thing the higher emissivity does is limit the stagnation temp which is not that useful.

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Old 10-23-12, 05:44 PM   #12
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What size of truck is it? 106HP is a lot.
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Old 10-23-12, 06:57 PM   #13
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Solkote I did read about and not that expensive. The truck is a S-10 EV made by GM. Its the same drive train as the famous EV1. About 60 trucks excaped the crusher.

My panels I had made with a 4" 100mm pitch between risers some of my materials were recycled so hopefully maybe capturing a little more heat at no extra cost.

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Old 10-23-12, 07:01 PM   #14
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Quote:
Originally Posted by randen View Post
Solkote I did read about and not that expensive. The truck is a S-10 EV made by GM. Its the same drive train as the famous EV1. About 60 trucks excaped the crusher.

My panels I had made with a 4" 100mm pitch between risers some of my materials were recycled so hopefully maybe capturing a little more heat at no extra cost.

Randen
I do like it. Where did you get the low iron glass? it kind of looks custom sized.
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Old 10-23-12, 07:14 PM   #15
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This is my Beastie, one tonne payload truck which is in process of getting a 1.9tdi Jetta engine and a quattro tranny. The two front takeoffs from the tranny will have electric motors on them and batteries will sit in a cavernous area under the rear seat. The goal is to get 2000km from a 70L tank of diesel.
The diesel engine is always producing power through the alternator which currently goes to a shunt so I will re-direct it to the batteries. I have no idea what the electrical fraction of the total mileage will be but it is fun to plan.

You are lucky to get the EV, I hear they were great trucks.
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Old 11-29-13, 02:43 PM   #16
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Default A little solar heat

Here in the great white north finally some sun. For the most part no solar heat was avalible for the month of Nov., Overcast and cold wind. This week lots of snow. Last night -14 Dec C. and today, FREE HEAT!!! At this time the concrete floor is 26 Deg. C and we'll likely see 27 Deg.C by the time the sun is no longer heating and this should keep us warm until tomorrow morn.

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Old 11-29-13, 06:24 PM   #17
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Good to see it's doing what it's supposed to. You can't control the weather but you can control the design and implementation. It looks like you did that well. Good work!
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Old 12-04-13, 04:31 PM   #18
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Default Solar hot water space heating for the shop

At last, the production of the copper fin and tube risers has begun. The plywood form tool needed to be lengthened 2 ft. The collector that had been manufactured for the house was 8 ft. were as the shop can sport 10 footers. The form tool is quite simple just two lengths of plywood with a piano hinge much like a book. The groove in each form half with a dowel in one forms the copper nicely with just a little force from a rubber mallet.

The copper tube and riser are cleaned bright with hydrochloric acid (muriatic) and just a little flux makes the solder flow. I use the solder to allow a seamless flow of heat collected on the fin to the copper tube and in-turn to the water propylene glycol mix.

This is going to be a long and tedious job only when time permits. ONLY 90 pcs required.

Randen






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Old 12-05-13, 07:56 AM   #19
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Cool setup. 90 pieces! Yikes haha.

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