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gbwillson

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And the fun continues...

Hi gang-

This study explores how to get the highest efficiency out of a solar collector in very cold climates. It is stated that efficiencies as high as 85% can be reached if the proper flow speed and gap are used.

Greg in MN[comp]

 
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pdf SAH_Analysis_of_high_efficiency_solar_air_heater.pdf (220.82 KB, 78 views)

Punky

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So put some chicken wire in between two sheets of glazing and run your air through there first then through the collector bumps up your efficiency.
gbwillson

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Welcome Punky!

So it would kind of be a pre-heater for the actual collector? Most heaters are already pulling air from the house, so it's not frigid air. 

Greg in MN[wave]


JohnGuest

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i`d say the heat gained probably wouldnt be enough to justify the drop in cfm from the longer path.     
jawbone

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Sorry, I tune out as soon as I see equations with x's and y's and brackets!!!! Black gets hot in sunlight - that's as far as my thinking goes!!!
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Punky

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I stumbled across those parts too but the jist of the article seemed to be about increasing efficiency.
gbwillson

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Reply with quote  #7 
What I do with most of these studies is read the abstract at the beginning to find out what the study is looking to prove or disprove. After that I skip to the conclusion near the end to see the results of the study. The conclusion is normally written in terms the layperson can understand. Often the bullet points in the conclusion make reference to a picture, diagram or chart farther up in the study. So if there are points in the conclusion I'm interested in knowing more, I can check out the reference point.

Keep in mind many of these studies are outdated, performed in less than ideal conditions and originate from foreign countries, such as India, South Africa, and Southeast Asia where climates are hot, and heaters are often used for drying food and grains, instead of space heating.

Greg in MN
Old McDonald

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Reply with quote  #8 
Greg, I totally agree with you approach to almost all research papers, and I source many on any wet day, almost all agricultural, and quite a few in foreign languages, but I can follow the gist in most Romance ones. Much easier to read a language than try to speak it.

Some people do it with books, which spoils the fun of reading it, but in these cases I find it is sensible - read the abstract and then the conclusion. If sufficiently interested I then read the rest of the paper. I usually skip the equations, because I do not understand them, but if necessary I have my son explain them to me in language I can understand.
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