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stmbtwle

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Reply with quote  #81 
Great link, thanks Greg.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay

gbwillson

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Reply with quote  #82 
I've made mistakes plenty of times when making performance measurements. With my anemometer I prefer to use MPH to take my readings as it reads only one digit to the right of the decimal and seems to be easier to settle in on a reading. It's also very relatable since I check my driving speed and wind speed with MPH. LFM, Meters/s, Knots, Kilometers/h, etcetera, are all useable too, but are either impractical being metric or nautical, or the reading changes so fast it's hard to get a steady reading. All measurements will work as long as you double check you are using the correct units of measure. My most common calculation error is forgetting to check for the proper radius for my duct size.

Sunny skies forecast tomorrow for I think only the 3rd day this December. High tomorrow of 15˚F with a low just below 0˚F. The coldest weather brings the sunniest skies!

Greg in MN
gbwillson

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Reply with quote  #83 
Hi Bruce-

I was looking back over this great ZP build of yours from last year. I realize we never got a final report card or update. Could you give us an update as to how the collector worked out for you last winter for things like performance numbers, what you like about the build, and what you might do different, etc. Curious minds want to know...

Greg in MN
Bruce

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Reply with quote  #84 
I didn't really figure out everything, as I would probably be disappointed with the actual BTU output, but I get a good amount of air (5.2-6.2 mph) out of the end of the output pipe.  I know that the temperature in the basement room where is it located was 50-55 degrees before it went online and is now 65-70 degrees when it is running with an 85-99 degrees output temp.  The room retains a good amount (cement floor and plaster covered masonry walls) so it doesn't ever get down into the low 50's in there at any time.  I moved some of the junk in the room to permit the output flow to hit the stairwell up to the kitchen above and it also makes the kitchen a bit warmer.  

I have a lot of shade to contend with.  During the summer, I covered the collector with a big white tarp and the fan would activate occasionally on a really hot sunny day a little afternoon, so I don't think it really caused any problems with too much heat...the output was mid 80s for 30-45 seconds at a time for maybe an hour.  I have a 2500 square foot house with a two ton heat pump, so I didn't notice what little hear I got.

It has been online now for 1 year and I have not had any problems with it.  I like the simplicity of the design.  I think if (OK, when) I build another one, I will not make it have 3 turns in direction. I built this one to fill the space I had for it.  Maybe a 2 or 3 foot high one way design would be easier and more efficient.  If I had to rebuild this one over again, I would probably design a better way to partition the 3 sections of the collector.  I used 2x2 wood and suspect that it will be problematic someday.  I will also rethink the mounting and sealing of the glazing when I get a round to it.  I like what Don did with his felt gaskets and will probably convert to something like that to increase my airflow.  I think I am losing more heat than I should through the glazing.  But a few other projects around here are taking priority over this or my next collector.

It is now cooling off around here and we have all noticed the heat in that room on sunny days when you walk into the room from the basement garage. I still get a kick out of hearing the fan come on and feeling that blast of heat when I walk in the door.  My nuclear engineer buddy was here on Saturday for a visit and was amazed at how much heat it was throwing into the room.  I think he will take on his own project soon,now that he is retired. ;-)

That's about the sum of things.  Would I do it again?  YES, in a heartbeat!
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