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klecroy

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Posts: 16
Reply with quote  #1 
I would like to try to heat an office 12x20.Its on a warehouse,pleanty of room,would the downspouts like at the basement of your house,or the screen type work best?
Should i pull air from attic,or the office,this way i do not have to heat the outside cold air.
Also i would like to put either on the roof. Thanks

gbwillson

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Reply with quote  #2 
klecroy-

Both collectors work very well, but screen collectors are lighter, easier to build, and far cheaper. 

Ideally, pull the supply air from the floor of the office as this will replace the coldest air in the room with the warm air from the collector. If you mount the collector on the roof, you will run the ducts through the attic, and have the supply duct down near the floor.

Greg in MN
klecroy

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Posts: 16
Reply with quote  #3 
Can i make small rolls of the screen and lay in the box, seems much faster ?
stmbtwle

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Reply with quote  #4 
Not sure anyone has tried rolls of screen. Interesting!

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Willie, Tampa Bay
gbwillson

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Reply with quote  #5 
Not sure if rolling tubes of screen would be faster than screen material attached to a simple frame. I would think the rolls would have to be raised off the back of the collector for best performance. And you would want the flow of air to pass through the "tubes" for best heat transfer and least air flow resistance.

Greg in MN
Rick H Parker

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Reply with quote  #6 
It would take more time to form the rolls/tubes then it would take to build a frame and attach a screen to the frame.  You would need to solder or glue the tubes to make sure they remain tubes, that is time consuming.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #7 
It would take more time to build, but tubes would provide more surface area to absorb sunlight and transfer heat to the air. MIGHT be something to it.

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Willie, Tampa Bay
klecroy

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Posts: 16
Reply with quote  #8 
How about 4" stove pipe,round and 90 degree bends can be bought,maby 24' then make 180 degree turn and run back to start, 
also how about 12vt car radiator fan,or do they pull too much air ? thanks
stmbtwle

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Reply with quote  #9 
Stovepipe for what, the tubes in the collector or the ductwork? I don't think 4"is enough for duct work, and aluminum drainspout is probably better in the collector. Easier to work with too.

Re the radiator fan. A: they come in different sizes and B: you can adjust the speed with a DC speed control (about $3 on ebay).

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Willie, Tampa Bay
klecroy

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Posts: 16
Reply with quote  #10 
Stovepipe for collector,thought it might be easier because its round.
I bought a fan on ebay for about 4 bucks but it was only about two and a half inches square,so not sure which way to go,thanks
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