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mranum

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Reply with quote  #31 
My wife has gotten on board with most of my brainstorms. [wink] She fianlly realized that I'm a pretty good judge at picking worthwhile projects.


BTW- was discussing this collector with my homeowners insurance agent the other day. Wanted to make sure there was no issue with it being attached to the building. Should have checked earlier but....  anyway, seeing as how its just air moving with a fan there was no issues. He said though that if it heated a liquid and the liquid provided the heat then they wanted to look at it. The concern was with leakage and freeze potential and the possible building damage that could result. He did say though that I may want to increase my coverage as it does add value to the structure.

Just throwing that out there. [wave]

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mranum

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Reply with quote  #32 
Well after months of getting side tracked I FINALLY got the siding put up around the collector. So here is a pic of the finished job. I still haven't closed it off for the summer yet but will soon. Its been a pretty cool spring around here for the most part and the shop still isnt really hot. It stays in the mid 70's in there this time of year but by late summer the heat is finally penetrating enough where I will open windows at night to cool it off in there.

With the collector vertical like it is it doesnt generate a ton of heat right now anyway. Two days ago we hit 90 but the collector temp was running about 87.

finished 2.jpg 


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SolarInterested

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Reply with quote  #33 
Looks great. You'll appreciate it next fall.
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gbwillson

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Reply with quote  #34 
Very well dine sir! Looks like it was always there. The deer will appreciate the nice looking collector. What will you be covering the collector with until next winter?

Greg in MN


Bert

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Reply with quote  #35 
Very nice!  In the Winter it will put out a lot more heat with the lower sun. My collector shows a big difference from Winter to now.
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mranum

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Reply with quote  #36 
Thanks guys! The flashing I put along the top has a decent overhang. I am planning on putting plywood behind the lip on the overhang with an attachment along the ground to hold it. Should work. The seasonal self regulating aspect of a vertical collector is nice fringe benefit of this design.

Dont know if you noticed but the outside the collector is a cream color. Wasn't suppose to be.[mad] My gloss white paint started out white  and as it dried turned cream. Maybe the metal was too hot. Oh well.

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Old McDonald

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Reply with quote  #37 
mrannum, Re insurance - a lot depends upon whether or not you have a mortgage. Some lenders insist that the house is insured for the value of the whole property. Under insuring can be a big, big problem in this sort of case if there is a claim.

On the other hand (and I have a lot of insurance experience) my argument for any building is that it should be insured for the replacement cost. My previous property in Scotland included a new build house standing alone in the middle of my own farmland with all round easy access. The electricity supply was underground from a transmission line far enough away that at most the underground line would need replaced; private water supply and septic tank were also far enough away that they would not be affected - fire was the most likely cause of any catastrophe. Demolition, site clearance and rebuilding costs would be far less than the value of the place, and less than the cost of initial development and construction. Insurance companies always want you to increase the amount of cover, but I see no point in covering a house for half a million if it would only cost a quarter million to clear the site and build a replacement. My bank manager lived in a second floor flat on the very corner of two busy roads in the city. The cost of clearing up and replacing that would be far in excess of its market value.

My present house is all stone, brick and concrete. I do not insure it. That can be put another way - I self-insure, relying on being able to pay for the effects of any loss that would normally have been covered by insurance. 
mranum

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Reply with quote  #38 
A little update here, and as a reminder my whole goal with this unit was to keep my shop from freezing in the late fall through early winter. My work leaves me virtually no time to be in my shop from October through the first half of January and every other year it gets so cold for so long that it takes literally weeks for my floor to warm up enough to where you dont freeze your feet after a couple hours. When my furnace died last year I figured it was as a good time as any to try solar. For the time being I used a propane Buddy Heater for additional heat when needed. While I haven't spent much time in the shop yet this winter I have been very pleased that it has held in the 40's for the most part. We had a very cold cloudy stretch where our high temps were either below zero or single digit, and it did drop into the upper 30's in the building for a while.

So, with the amazingly clear sky yesterday I decided to see how my solar unit was doing out in my shop. These reading were taken about 11:30 this morning. My fan normally puts out about 450 CFM, however my filters are really quite dirty so I am estimating my CFM to be around 400. I don't have my meter at home right now so I couldn't check for sure. BUT, with a temperature differential of 43.5 degrees between the incoming and the outgoing air....that translates into about 18,792 BTU's per hour. Not bad!  By mid afternoon my shop temp was around 60 degrees.(y)





1-18-17 bright sun 1130am.jpg


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mranum

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Reply with quote  #39 
Well I added some fresh clean air filters so while I did not test my current CFM it should be close to my original rate which was around 450 cfm. We've been nothing but clouds and warm temps for a while but this weekend brought a couple rounds of snow and now clear and cold for a while. This afternoon, with 5" of fresh snow on the ground and crystal clear sky I had air temps going into my collector of 45 degrees and 90 degrees out the exhaust.

Thats a 45 degree differential at 450 cfm! Say what you will but a Zero Pass works! [biggrin]

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gbwillson

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Reply with quote  #40 
I'm NOT surprised at your numbers. Assuming you have fresh snow on the ground, I wonder just how much that strong reflection would add to the performance numbers you posted. Your collector is roughly 64 sf, but if the sun is shining brightly, does that essentially add to the collective area? I know it won't double the collecting area, but with new snow and clear skies, it should add a lot to the performance. I would think as much as a hazy sky.

And if you have a 45˚ temp increase, with a 45˚ input temp, you may need either more air blowing through as your may get too hot. Once the workshop temp gets up to 65˚ or more, and assuming the collector increase is still 45˚ @ 45CFM, you might be looking at some output temps of 120˚ or more! 

Nice problem to have!


Greg in MN
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