Today the inlet air temp is 17C (62.6F) and the outlet temp was 54C (129.2F) and I just stuck my glass thermometer in the outlet for less then 3 minutes, didn't want to break my thermometer already broke one (dropped it). That gives me a 37C (98.6F) temperature rise, might still need a bigger fan.
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Yeah, I think I'd go for more airflow.
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How did you get a uniform curve on the top and bottom edges? did you use a giant compass or something?!
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thats exactly what i was thinking of doing but figured I'd ask. I hate reinventing the wheel :)
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Just a little update. Well after having only 2 hours of usable sun shine in the last 3 days the temperature in my garage was down to 14C (57.2F). As of noon the temp has climbed to 17C (62.6F). The fan has been running continuously for about 2-1/4 hours now. The inlet air temp is 17C (62.6F) and the outlet air temp is 50C (122F). By the way outside temp is 6C (42.8F). Panel has had full sun for about 1-3/4 hours. Looking good so far :)
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That rocks mike, very encouraging! I'll be very interested to see what kind of temp differentials you're getting when winter sets in. What's normal and extreme low temps for your area? We normally get an average around -15 to -25c from november/december to march/april with a few cold snaps around the -35c mark in january. I'm picking up my glazing next week, so construction on mine should start very soon. still need to pickup a fan and solar panel, but at least i can start building once i have the glazing.
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Picked up my acrylic today! Got to thinking tho, how did you deal with thermal expansion/contraction of the glazing? has it pulled away from your sealing at all? did you just drill holes through it and screw it on? Seems to be what everyone else is doing, but nobody seems to have any problems with this approach?
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If I were to redo the glazing I would try to find 1/8 x 3/4 inch butyl tape, ift would probably work better with the expansion and contraction of the glazing. I would also just make a straight box, (no curve on the front) the you can finish the box on all sides with the aluminum faciato make a nice professional looking panel. |
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