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rustythread

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Posts: 20
Reply with quote  #1 
I'm in the throes of trying to plann out an approximateoy 8' x 24' ZP collector system, and re-re-reading all of the marvelous posts here.  Sure don't claim that I comprehend all of them.

Anyhow, this will be a permanent installation fixed to the south-facing  wall of my shop building.  I have no more than 9' in available wall height.  The overhang calculator I found tells me that at my latitude and  longitude, I will need a 3' overhang, with the bottom horizontal plane of the overhang 2' above the top of the collector. Obviously, with an 8' collector on a 9' wall, this ain't gonna happen.  To get any slope at all on the overhang to ward off precipitation, the bottom plane of the collector is going to be near-as-dammit right on top of my collector.  I could cut 2' off the height of the collector, but that looks like creating a whole bunch of construction kinks, like cutting 2' off a bunch of 8' glazing sheets, etc.

I don't want to be having to cover the glazing from mid-spring to mid-fall, so an overhang is necessary.

Any suggestions on how to configure this for the best of a bunch of bad solutions?

Thanks, all.

Rick H Parker

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Reply with quote  #2 
Figure out what day of the year you want to collector to become fully shaded. Calculate the altitude of the sun on that day.  Set the overhang so that the angle from the end of the overhang and the bottom of the collector is the same as the calculated altitude.  The collector will be fully shaded until the sun returns to the same altitude.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
gbwillson

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Reply with quote  #3 
It seems like you are complicating this issue.

If you mount an 8' high collector on a 9' wall, What is your concern about not having a large enough overhang? So you don't have to cover the unit each fall? Even if you currently have no overhang, the sun will continue to rise in the sky, and at some point most of the sun's rays are reflected off the glazing. I know a couple people who don't even bother to cover their vertical mounted collectors. One has his heat into the workshop. He said by late spring the angle is such that the collector rarely activates. The other person added an extra, external vent to prevent any excess heat from entering the home during the summer months.

Natural plants and trees can also be used to partially cover a collector. But the main point is that a cover can be simple or complicated. You can use covers in season as reflectors, and in the summer as covers. I hate to see you greatly alter your build due to the desire not to cover your collector, if needed. And building a collector half as tall just doesn't seem like a wise choice to avoid having to protect the unit during the summer.

Greg in MN
Bert

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Posts: 499
Reply with quote  #4 
You would most likely need an adjustable overhang to do what you want. Pretty complicated.
I would just use a cover.  
Take a look at the one I finally came up with. I think it looks good. Is fairly easy to install and almost makes the collector invisible.

https://simplysolar.supporttopics.com/post/show_single_post?pid=1295713427&postcount=217&forum=282856



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Bert K.
Michigan

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rustythread

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Posts: 20
Reply with quote  #5 
Guys, I appreciate the replies and the thoughts therein.  I'll look into the solar angle calculations and see what looks feasible.  The side of my shop which will hold the collector is in the fenced-in yard with a very active dog so I'm kinda limited on ground-based solutions such as plantings or cover/reflectors on the ground.  Also, much as I hate to admit it, I'm going on 76 and not as spry as I used to be--I want to get the collector up and running, then be done with hoisting panels and covers around.
gbwillson

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Reply with quote  #6 
Rustythread-

Then perhaps focusing on a way to vent the unit during the summer months would be an option. Combined with a full or partial overhang should keep the collector temps very reasonable.

Greg in MN
rustythread

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Posts: 20
Reply with quote  #7 
Thanks, Greg.

I will keep that thought in mind while I'm working on the design.   Am I correct in thinking I ought to put insect screen on the vent to keep critters from nesting inside?
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