Registered: 1388591029 Posts: 2,994
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Looking forward to it!
__________________ Solar is like the wind. It may be free, but putting it to work isn't! Willie, Tampa Bay
Registered: 1359070732 Posts: 2,240
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UPDATED NOVEMBER 11th 2015 ========================= We have had several good days lately, weather very mild, so managed to get a few test sessions in (perhaps 4 or 5). I have been documenting the test less, and relying more on "feel" to determine how the system is performing. Also, I am using an electronic temperature device, instead of alcohol (well, I still use the alcohol -- quite a lot actually -- but AFTER the tests...) The major change is, I upgraded the ducting to six inch diameter, and it shows ! Also, I just run the fan on HIGH, all the time, as messing with speed-changing feels like a waste of time (and energy!). I improved the fan delivery by lengthening the duct from 9 inches to two feet with a semi-rigid aluminum section that I can point a bit. The blast out of the duct is surprising - easily felt one meter away. I still have not determined actual airflow in CFM. I found a similar fan to mine and it says it pushes 750 m3/hr = 430 CFM. I could maybe believe this, actually ! For my thinking, the duct exit is still too close to the backwall (read, system effect) but that is a minor point at the moment... Finally, I also got the set-up a lot more ergonomic, down to just a minute or two. (Translation: my hyperactive canine assistant (admirer...) no longer ecapes during the process...). ========= So I just dump bulk FACADE air into the garage. This is external air, warmed through the slates. So low-grade heat - nothing astronomic here. Purely experimental. (my wife says to remove the "experi" bit...) Fan exit temp is best measured by moving the recorder in a continuous spiral motion, "along the axis of blast", moving longitudinally to and fro, to over one meter from the duct exit. After a minute of this fatiguing (fun) exercise, the temperature just about maxes out. Greatest TD I have seen is 5°C (= 9°F) over and above the external air temp. I was pretty happy with this: without the system operating, the garage temp would only rise about 2°C (4°F) above ambient, and it is real s-l-o-w). I bought an activated carbon filter and installed it upstream of the fan, thinking it would intercept any nasties (= strands of fiberglass, and DUST...)... However, this filter cut down the airflow pretty dramatically, so I immediately removed it, and now I have it "sort-of taped up", after the air delivery end, like a flap, hoping it might perform just SOME... I suspect what I need is a wider-mesh screen, upstream again. (To be tested). One or two final final points: I installed another three steel liners inside the facade slots, thinking they might "fix" slate heat and improve heat-transfer to air... Again, their effect will be difficult to evaluate, I suspect. However, that does not matter, as their main benefit will be for my when I install a copper HYDR collector. (for which I will be posting another update soon...) so watch this space ! thanks for watching this channel (all mis-opinions, errors and bad design practice will be corrected later) G_H __________________
(1) "Heat goes from hot to cold, there is no directional bias" (2) It's wrote, "voilà" unless talking musical instruments...