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15 CommentsMexicali, Baja California, Mexico
Retired - working on the parabolic solar hot water heater; maintaining the house; Devotional meetings every Fri. w/the wife and friends; Study Circle - Book V, etc.
  • Thanks again for replying! That was a good explanation of the differences. Here's our site on Appropediahttp://www.appropedia.org/Parabolic_Solar_Hot_Wate...BTW, we've done the research and a mirror-like coating is superior and, as you might be able to see, our collector tube is - black.Have a super afternoon! :)

    Thanks for this reply - it was very interesting. It had very different suggestions for "other" glues. Lol - roof repair coatings. Uf - i'm thinking tar - hot tar. i've worked a litlle (very little) with the contact cement for countertop laminates. i appreciate the suggestion, but as you mentioned, you basically get just one shot at getting it right - and it's really, really, sticky. It has to be in order to hold something as hard and heavy as the laminate in place.We're using someting like .002" Mylar - it's thinner than paper. It doesn't tear very easily but is a little difficult to work with on a windy day so i'm still thinking about something that will just keep it down - a little tacky! (that's the word!) - but not too much so that we can still move it about a ...see more »Thanks for this reply - it was very interesting. It had very different suggestions for "other" glues. Lol - roof repair coatings. Uf - i'm thinking tar - hot tar. i've worked a litlle (very little) with the contact cement for countertop laminates. i appreciate the suggestion, but as you mentioned, you basically get just one shot at getting it right - and it's really, really, sticky. It has to be in order to hold something as hard and heavy as the laminate in place.We're using someting like .002" Mylar - it's thinner than paper. It doesn't tear very easily but is a little difficult to work with on a windy day so i'm still thinking about something that will just keep it down - a little tacky! (that's the word!) - but not too much so that we can still move it about a bit in order to make sure it's smooth and there's no bubbles (if there were), and then seal the ends so the wind can't get in under it. The suggestion below sounds interesting: vacuum pump oil... Will await Toga's friend's comments...What's the difference between the latex and the silicone glues?

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  • How about just using something like some sort of silicone spread out first so that the Mylar can be laid and then just taping (we have some nice metalized tape that is really strong) the edges? We have seen that using small strips of double-sided tape doesn't work because we can't cover the whole sheet and although when there is no wind, it looks good (nice and smooth), when we have the slightest breeze, the Mylar ripples. If we could just use something like silicone to basically hold it down until we can get the edges taped - this might be enough for it to stay in place after taping.We think that once we get it taped down, that even a pretty strong wind would be unable to lift it off of the parabola since the wind wouldn't be able to get under the Mylar... ??Oh, thanks a lot for rep...see more »How about just using something like some sort of silicone spread out first so that the Mylar can be laid and then just taping (we have some nice metalized tape that is really strong) the edges? We have seen that using small strips of double-sided tape doesn't work because we can't cover the whole sheet and although when there is no wind, it looks good (nice and smooth), when we have the slightest breeze, the Mylar ripples. If we could just use something like silicone to basically hold it down until we can get the edges taped - this might be enough for it to stay in place after taping.We think that once we get it taped down, that even a pretty strong wind would be unable to lift it off of the parabola since the wind wouldn't be able to get under the Mylar... ??Oh, thanks a lot for replying!

    Thanks, Downunder35m! We'll have to give it a try!Have a super evening! :)

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  • frazelle09 commented on MidnightMaker's instructable Solar Tracker in the Internet Cloud10 months ago
    Solar Tracker in the Internet Cloud

    Wow. This is great!We are trying to do something similar, but just with one-axis tracking since it's for a solar hot water heater. Here's our link to our Appropedia site...http://www.appropedia.org/Parabolic_Solar_Hot_Wate...As you can see, we've stopped using the LED tracker in favor of some programming and a Raspberry Pi A, but since i'm not a coder, even though the code is Open Source from Jay Dosher, i'm having to step through his code in order to update it to Python 3.x and it's a bear - lol. i'm on step 250 or so and have some 250 more lines to go. Then we have to connect it to a IMU which will give us the orientation of the collector. My question would be: Do you think any of the code you're using would be simpler to use? He's got his code connected to the Pysolar code whi...see more »Wow. This is great!We are trying to do something similar, but just with one-axis tracking since it's for a solar hot water heater. Here's our link to our Appropedia site...http://www.appropedia.org/Parabolic_Solar_Hot_Wate...As you can see, we've stopped using the LED tracker in favor of some programming and a Raspberry Pi A, but since i'm not a coder, even though the code is Open Source from Jay Dosher, i'm having to step through his code in order to update it to Python 3.x and it's a bear - lol. i'm on step 250 or so and have some 250 more lines to go. Then we have to connect it to a IMU which will give us the orientation of the collector. My question would be: Do you think any of the code you're using would be simpler to use? He's got his code connected to the Pysolar code which calculates the Sun position. Again, congrats on such a beautiful project. Hope the kids stay interested in engineering! i had one of our grandchildren who is 5 - almost 6 - help solder some wires to connect the one-wire temperature sensor and connect it to the web...https://thingspeak.com/channels/72565 The other question is: i don't think we are using a stepper motor. Can a regular D.C. motor be used with these designs or are we going to have to find a stepper? The one we are presently using is 12V 1.2Amp which will turn up to 5 collectors. Have a great morning! :)

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