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Evacuated Solar Tube Implosion Solar Water Heater Thermal Storage

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Language: en

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hello them your host dan Rojas there is
00:00:02.330 00:00:02.340 a video that's been circulating on the
00:00:04.070 00:00:04.080 internet for many years where a guy
00:00:06.200 00:00:06.210 takes a evacuated tube solar
00:00:08.780 00:00:08.790 water-heating tube like this and drips
00:00:11.959 00:00:11.969 water on the nipple and it boils away
00:00:15.490 00:00:15.500 with any luck I'll be able to show you
00:00:17.900 00:00:17.910 why you don't want to do this and I'll
00:00:20.060 00:00:20.070 also be able to show you the interior
00:00:21.880 00:00:21.890 what makes up a vacuum tube like this
00:00:24.880 00:00:24.890 our temperatures are very hot with no
00:00:27.830 00:00:27.840 soil reflectors for no lens this has
00:00:29.870 00:00:29.880 been sitting out in the Sun for a few
00:00:31.189 00:00:31.199 hours now all we need is some sort of
00:00:34.160 00:00:34.170 distraction of excess water dripping
00:00:40.040 00:00:40.050 inside of the hot vacuum tube and banks
00:00:42.670 00:00:42.680 keep in mind I have eye protection on a
00:00:46.090 00:00:46.100 typical vacuum tube like this consists
00:00:49.610 00:00:49.620 of clear borosilicate glass continuously
00:00:52.490 00:00:52.500 form creating an inside chamber with a
00:00:55.010 00:00:55.020 dark surface or absorber that allows
00:00:57.529 00:00:57.539 sunlight to enter the outer part of the
00:00:59.540 00:00:59.550 glass and then collect on the inside
00:01:01.490 00:01:01.500 because there's a vacuum around it keeps
00:01:04.280 00:01:04.290 the heat from escaping out this way
00:01:06.050 00:01:06.060 transferring most of the heat to
00:01:07.609 00:01:07.619 whatever's inside even though the
00:01:09.620 00:01:09.630 material inside here is very hot I can
00:01:11.750 00:01:11.760 touch the outside layer it's just like a
00:01:14.120 00:01:14.130 regular thermos that you had hot coffee
00:01:16.249 00:01:16.259 on the inside outside is nice and cold
00:01:18.620 00:01:18.630 these tubes are some of the most
00:01:20.570 00:01:20.580 efficient ways of collecting sunlight
00:01:22.460 00:01:22.470 and transferring it to water for maximum
00:01:25.370 00:01:25.380 efficiency a tube that has water inside
00:01:28.310 00:01:28.320 directly in contact with the inner layer
00:01:30.530 00:01:30.540 is the best option the problem with that
00:01:33.140 00:01:33.150 is that these tubes can only hold about
00:01:34.760 00:01:34.770 seven psi so if you put a 40-pound
00:01:37.460 00:01:37.470 pressure water system to it it'll snap
00:01:39.469 00:01:39.479 the tube solar water heaters using mini
00:01:42.380 00:01:42.390 tubes like this up to 20 have come up
00:01:44.929 00:01:44.939 with a rather ingenious way of taking
00:01:46.760 00:01:46.770 care of that problem with the pressure
00:01:48.370 00:01:48.380 this copper piece it's a sealed copper
00:01:51.920 00:01:51.930 tube all the way down and there's an
00:01:53.749 00:01:53.759 exchange fluid in there that rises and
00:01:56.149 00:01:56.159 falls bringing the heat up to the
00:01:57.709 00:01:57.719 highest point this part is inserted into
00:02:00.620 00:02:00.630 the water tank and this is what comes in
00:02:02.600 00:02:02.610 contact with the water it's not the most
00:02:04.730 00:02:04.740 efficient way of doing it but it does
00:02:06.350 00:02:06.360 work very well the one problem with this
00:02:09.020 00:02:09.030 is that they use aluminum fins make some
00:02:12.020 00:02:12.030 very lightweight easy
00:02:13.640 00:02:13.650 inexpensive but because the aluminum
00:02:15.770 00:02:15.780 fins don't transfer all of the heat the
00:02:18.199 00:02:18.209 inside of this tube can get extremely
00:02:20.149 00:02:20.159 hot if you live in a place like Florida
00:02:22.280 00:02:22.290 where we are you get flash thunderstorms
00:02:24.979 00:02:24.989 that pop up out of nowhere and that
00:02:27.259 00:02:27.269 water can get down inside of there one
00:02:29.210 00:02:29.220 or two drops enough to shatter the tube
00:02:32.000 00:02:32.010 as an option to the fin I've tested
00:02:34.250 00:02:34.260 other materials like zinc pellets metal
00:02:36.319 00:02:36.329 pellets and I've also tested dry sand
00:02:38.509 00:02:38.519 the problem with zinc pellets and metal
00:02:40.789 00:02:40.799 pellets is that they tend to oxidize or
00:02:42.470 00:02:42.480 rust white beach sand completely dry
00:02:45.949 00:02:45.959 seems to work the best if it does get a
00:02:47.720 00:02:47.730 little damp it's still enough to
00:02:49.940 00:02:49.950 eventually evaporate away first up is
00:02:53.420 00:02:53.430 our dry sand
00:03:05.240 00:03:05.250 our dry sand is doesn't look hot right
00:03:07.850 00:03:07.860 now but that's 280 degrees oh wow 295
00:03:13.690 00:03:13.700 it's pretty impressive pour some water
00:03:16.250 00:03:16.260 on there just a little bit ha so even
00:03:24.500 00:03:24.510 though that sand doesn't look hot you
00:03:26.170 00:03:26.180 can see that it has no problem instantly
00:03:29.300 00:03:29.310 boiling flash boiling water and the test
00:03:43.250 00:03:43.260 that I've done the white beach sand
00:03:44.810 00:03:44.820 inside just because it's white that
00:03:46.970 00:03:46.980 usually reflects sunlight away but it
00:03:49.730 00:03:49.740 never sees sunlight it's just touching
00:03:52.040 00:03:52.050 the surface it gets within 10 degrees
00:03:54.620 00:03:54.630 Fahrenheit of what the metal fins do the
00:03:57.320 00:03:57.330 other advantage to using something with
00:03:59.510 00:03:59.520 thermal mass like beach sand is that in
00:04:02.240 00:04:02.250 the evening time when hot water is
00:04:04.070 00:04:04.080 mostly used there is some thermal
00:04:07.670 00:04:07.680 storage inside of there so it
00:04:09.050 00:04:09.060 continually adds heat to the water tank
00:04:11.390 00:04:11.400 even when it's being used after the
00:04:13.310 00:04:13.320 sunset so this is the tube
00:04:22.830 00:04:22.840 so after three and a half hours with no
00:04:25.899 00:04:25.909 sunlight the sand is still stored 193 if
00:04:39.369 00:04:39.379 you have a water system or some solar
00:04:41.350 00:04:41.360 tubes and you want to test it try dry
00:04:44.439 00:04:44.449 beach sand and see what results you get
00:04:46.450 00:04:46.460 keep in mind that if you have a
00:04:48.490 00:04:48.500 professionally installed system one that
00:04:50.499 00:04:50.509 somebody charged you two and saw if you
00:04:53.709 00:04:53.719 take the fins out and put beach sand and
00:04:55.899 00:04:55.909 you'll probably void the warranty so
00:04:57.760 00:04:57.770 this is something for someone who bought
00:05:01.089 00:05:01.099 it off the internet maybe had some tube
00:05:03.459 00:05:03.469 chatter because rain gets in there this
00:05:05.499 00:05:05.509 is a good option for it
00:05:06.850 00:05:06.860 always remember never to put any liquids
00:05:09.490 00:05:09.500 or oil or food material whatever inside
00:05:12.939 00:05:12.949 of an evacuated tube that's been sitting
00:05:15.040 00:05:15.050 out in the Sun for more than a few
00:05:16.480 00:05:16.490 minutes because the inside surface can
00:05:18.219 00:05:18.229 get enough to cause it to shatter if you
00:05:20.469 00:05:20.479 do have boiling water in here like say
00:05:23.200 00:05:23.210 you put water in set it out in the Sun
00:05:25.350 00:05:25.360 put a parabolic mirror on it to speed it
00:05:27.999 00:05:28.009 up or Fornell lens when the water's just
00:05:31.420 00:05:31.430 below the boiling point something
00:05:33.040 00:05:33.050 interesting can happen if you agitate it
00:05:35.469 00:05:35.479 just enough the water can come up to the
00:05:37.930 00:05:37.940 portion of the tube that has not been in
00:05:39.760 00:05:39.770 contact with the water this raises the
00:05:42.040 00:05:42.050 heat of it drastically and causes water
00:05:43.990 00:05:44.000 become flashing out of it so what you
00:05:46.839 00:05:46.849 want to make sure is you always be
00:05:49.059 00:05:49.069 careful when you handle anything that's
00:05:50.920 00:05:50.930 been in this if you're making tea with
00:05:52.420 00:05:52.430 one of these just be careful this is the
00:05:55.119 00:05:55.129 basics of solar evacuated tubes there's
00:05:57.550 00:05:57.560 more information on these evacuated
00:05:59.740 00:05:59.750 tubes on our website green power science
00:06:01.390 00:06:01.400 comm including ways of properly using a
00:06:04.990 00:06:05.000 Freneau lens parabolic mirror or trough
00:06:07.719 00:06:07.729 collector to drastically increase the
00:06:10.540 00:06:10.550 efficiency I'm your host Dan Rojas thank
00:06:13.179 00:06:13.189 you for watching and enjoy our videos

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