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Bruce

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Posts: 108
Reply with quote  #21 
This is interesting...makes me think about things I am not creative enough to come up with on my own...but I will borrow someone else's idea and work with it.  I wonder if the manifolds and the turn were set up empty or with more traditional zero-pass design would improve the airflow and simplify construction? Maybe just make tubes and put them into the gaps of the zeropass screens might even work...hmmmmmmmmmm   Gonna need a bigger fan....

dademac

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Posts: 17
Reply with quote  #22 
thanks for the info Bruce. I got a different fan today. It is a 4" booster fan. It's supposed to be 420 cfm but I doubt it is close to that. Today it was 28 and sunny and I had a steady stream of 90 - 95 degree flow. I guess it's obvious that I had no idea what I was doing, but with all the ideas you guys have given me I believe I will make some changes. I will let you know how it turns out.
gbwillson

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Reply with quote  #23 
Booster fans can be very helpful, but generally don't do well at handling static pressure by themselves. They work best with air that is already moving. Another nice thing is that since they are designed to be in the airflow, they can have a higher heat rating. 

As far as creativity and design, you can always post an idea, or build a test collector. Many, if not most ideas come from brainstorming. Everyone looks at a problem differently. I like to have the glazing of my collectors easy to remove if I need to make changes or periodic maintenance. 

Bruce-

I think you are correct to simplify the turn. Don't make the common mistake of overthinking a problem and never getting around to building. You can always build a new collector, but until then you have a working collector adding heat to your home.

Greg in MN
dademac

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Posts: 17
Reply with quote  #24 
I have looked and have not been able to figure out how to respond to an individuals post. I made some changes today. Even though my loop to loop design has been intriguing to many of you, I have cut the boards that the loops were stapled to, then turned the loops so they would be parallel to the flow of air. I inverted the loops so the board was against the glass instead of the screen. It looked much better after I straightened the loops and put the glazing back on.

20180203_161247 (1000x563).jpg

dademac

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Posts: 17
Reply with quote  #25 
20180203_162333 (1000x563).jpg 
SolarInterested

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Spam Stomper
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Posts: 1,036
Reply with quote  #26 
Quote:
Originally Posted by dademac
I have looked and have not been able to figure out how to respond to an individuals post.
There's a pencil icon at the top right of each post. Use that to quote the post but please trim the quotes to eliminate un-needed text and keep the post brief

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Both temperature rise and airflow are integral to comparing hot air collectors
dademac

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Posts: 17
Reply with quote  #27 


Greg's brain is rattling in MN

I tried to incorporate some of your suggestions and turned the loops sideways so that the air can pass through better. Look at my latest post.
gbwillson

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Reply with quote  #28 
Looks good dademac-

Did this improve the airflow? how about output temps?

Also, you will want the screens to be clear of the duct openings so no air has to pass through screen material in order to move through the collector. You can keep screen on either side to the openings as the air still would have no restriction from the screen.

From what I can see, it kinda looks like the small frames are offset from each other, so one side is angled one way and the next the opposite way. 

Greg in MN
dademac

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Posts: 17
Reply with quote  #29 
Quote:
Originally Posted by gbwillson
Did this improve the airflow? how about output temps?

Greg in MN

Hey Rattlin

Output temps were holding at 105, and inside panel temp was 165 at 3 in the afternoon. I then installed a fan that moves more air so I hope to know more tomorrow.


Moderator here. Thanks for trimming the text of the quote but I forgot to mention that you have to leave the BBcode quote tags intact. In the example below I had to add spaces inside the brackets of the quote tags for them to display as text. That's not required in normal use.

[ QUOTE=gbwillson] text here [ /QUOTE ]
dademac

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Posts: 17
Reply with quote  #30 


[ QUOTE=gbwillson] text here [ /QUOTE ]

Hi to all,

I am wishing for some sunny days I see people are still looking at my feeble try at making a solar panel. Actually I am getting good heat out of it just not enough. I am now using a salvaged fan out of a discarded microwave oven. It is about the same size of the large computer fan but runs on 110V and puts out much more air. I have a anemometer ordered from China. (you never know when it will get here.)
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