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Onoff

Solar Thermal Brackets

16 posts in this topic

ID: 1   Posted

Anyone ( @binky ?) point me at where's best to get brackets to mount 3 of these:

 

20170501_175300

 

IMG_20170427_101427.thumb.jpg.aeb504d78b649ab2170e04f8733857f4

 

To this roof profile:

 

2017-04-22_04-03-33

 

I assume the necessary brackets are stainless? If I had even a sketch/ drawing I'll make my own.

 

Cheers.

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ID: 3   Posted

7 hours ago, roys said:

Cheers. Can't help thinking "Unistrut" looking at all this! :)

 

These seem to be brackets that would go with my tile in the animation, just wish I could get the measurements to make myself:

 

http://www.yougen.co.uk/blog-entry/2675/Will+installing+solar+panels+lead+to+a+leaking+roof'3F/

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ID: 4   Posted

talk to your local electrical wholesaler, they all have eco-departments these days. Something like the bracket below is what you want, note the height adjustability, you don't want the arm of the bracket resting on the tiles, it will cause them to break, and battens can vary in height.  No drilling tiles either. Use mushroom head screws, something like No.6 or 8 fix direct to rafters not battens. Trim tile around bracket arm, makes job neater, and stops small birds nesting in your roof,

 

100001-001_300x300.jpg

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ID: 5   Posted

1 hour ago, binky said:

stops small birds nesting in your roof

 

You mean like Barbara Windsor?

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ID: 6   Posted

First loose women then Barbara Windsor....

 

You watching too much daytime TV Lurch? 

 

You need to take the owl for a walk...

owl_southern_white_faced.jpg

 

I made my own BTW...

 

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ID: 7   Posted

On 02/05/2017 at 18:38, Blue Duck said:

I made my own BTW...

 

What, panel brackets?

 

Amazing how hot these things get just standing against a wall on an overcast day! Not sure if there's even any glycol in the things.

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ID: 8   Posted

What happened to the beer cans?

 

I made some for a pv panel out of old steel sheving and some scrap I had lying about, not on a tiled roof either!

So probably not much help but maybe I'm trying to get you to make you own. :)

 

My old man has one solar thermal panel on  his roof and is very pleased with it so three should be good!

 

:D

 

 

 

 

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ID: 9   Posted

those are vacuum insulated glass tubes with black finned copper tubing, they really do work well. Bit like a car, you need to maintain the anti-freeze about every 5 years, and you need a water tank with dual coils. You could make brackets, but it would probably cost more in your time than it's worth. The picture I posted of a universal bracket costs about £5, and is marine grade stainless steel. If you are coming down my way for a holiday, I have various off cuts of rail you can have ( not worth posting, they aren't that expensive). galvanised unistrut is a possibility.

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ID: 10   Posted (edited)

Cheers, maybe if we do an IoW visit this year I'll come scrounge your offcuts! :) Got a picture of the rail in question or link to a dimensioned section? Still thinking st/st angle if I can get cheap from my fabricator!

 

So it seems the company behind these panels was dissolved in 2013 so I've no issue posting there up from the brochure that I got from the people who have me the panels:

 

diag_001

 

spec_001

 

Of course all I have is the 3 panels and none of the other components! All the house has is an oil boiler and gravity fed, traditional copper hot water system.

 

Plan is to put the panels on this SW facing roof.

 

SAM_6158_zps3fe9c218

 

From what I've read and heard the "issue" if you can call it that is that these things can produce too much hot water. Better having to deal with the excess than not so I'm thinking of a thermal store.

 

Short term I want to integrate with what I've already got.

Edited by Onoff
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ID: 11   Posted (edited)

good roof pitch.

 

I'm not sure, but if the water is getting too hot I think they re-circulate the hot water, or it gets sent to a radiator to dissipate heat.

Edited by binky
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ID: 12   Posted

12 minutes ago, binky said:

good roof pitch.

 

I'm not sure, but if the water is getting too hot I think they re-circulate the hot water, or it gets sent to a radiator to dissipate heat.

 

Yes I've seen something with lots of copper fins. Even read people advocating running dedicated clothes drying or towel rads. The most inventive one I've read was somebody proposing dumping heat into the GROUND to recover later in the year!

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ID: 13   Posted

Hot rocks I've heard of, but Hot Worms.....:^O

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ID: 14   Posted

8 hours ago, Onoff said:

From what I've read and heard the "issue" if you can call it that is that these things can produce too much hot water.

 

I've been to a couple of systems where the panels are outputting far more than the tank/system can dissipate and so everything just gets ridiculously hot (like >100°C hot). Best/easiest option is to dump the heat into the radiators, or at least have a decent heat leak radiator.

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ID: 15   Posted (edited)

6 hours ago, Lurch said:

 

I've been to a couple of systems where the panels are outputting far more than the tank/system can dissipate and so everything just gets ridiculously hot (like >100°C hot). Best/easiest option is to dump the heat into the radiators, or at least have a decent heat leak radiator.

 

Cheers. I've seen some places selling what are clearly standard rads as heat dumps. Still fancy the heat store then I can divert to the UFH.

 

So what happens with the above diagrams in the event of an overheat as there's no heat dump? Does the glycol go to the expansion vessel effectively purging the system of heat transfer fluid albeit temporarily?

Edited by Onoff
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ID: 16   Posted

5 hours ago, Onoff said:

I've seen some places selling what are clearly standard rads as heat dumps.

 

Do the same job, I've seen rads randomly fitted in roof spaces used as heat dumps, whatever works I suppose. Just a waste though so really a last resort.

 

5 hours ago, Onoff said:

So what happens with the above diagrams in the event of an overheat as there's no heat dump? Does the glycol go to the expansion vessel effectively purging the system of heat transfer fluid albeit temporarily?

 

The expansion vessel will just take up the expansion, it won't take any additional heat as such. If the system gets too hot it just gets hot. All of the systems I have dealt with though have been triple coil tanks so it's relatively easy to use all or some of the radiators as heat leaks. I actually started to design a more complex/standard control system for triple coil tanks so the valves and bypasses all worked and the priority did what it should. Most systems relied on standard tank stats and pipe stats so they weren't all that accurate, especially with 3 stats all working in a 20°C range with huge hysteresis meaning it was anyones guess what would happen.

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