Solar thermal parabolic trough cloudy test 

I was just demonstrating the efficiency of the collector on a cloudy day and how it can still generate useful heat. The water came out of a tap (probably room temp), the relief valve is 20psi, and the system started out at atmospheric pressures. the water coming out of the relief valve was about 250F. This is just water in a closed loop that has no where to go as well as no where to dump the heat, so it's more drastic than if I was just running the water through a heat exchanger and processing the heat. I appreciate the feed back and will try to include temps in my next videos.

Interesting what results could be in a cold climate at winter in a cloudy day. Of course the results would be positive but what size the system must be to keep a house warm? Is it doable and financially resonable?

the tubes are parallel. absolutely, the collector is rated at 1500w so you can consider it the same output as an equivalent electric water heater.

@@ConservativeHippi Thank you, and how much would I need to produce warm water for showering at a hazy winterday when there is a bit fog or high thin clouds? Another question: Are these vacuum tubes in direkt contact with the water? Or are there heat pipes that reach into a collector and heat the water there?

@@SD_Alias Depends on the size of the tank and the desired temperature. Rather than a heat pipe that has a single header, there are two headers on this collector. The water flows through a copper tube connected to a header, goes all the way down the length of the vacuum tube, loops and returns to the same end, connected to a secondary header. kind of like a flat plate collector where the water actually passes through the collector. These collectors are intended for commercial applications so they would be more than enough for you needs. On a nice sunny day, with one collector I've had a 40 gal water heater up to 270f+ and by morning the temp was still 160f, at the top of the tank.

@@ConservativeHippi Thank you! That sounds like a good idea. I am planning a 200 liter solar water tank and would like to use my gas heater as infrequently as possible to heat water in the winter. With 3-4 such collectors it could work yes. Except maybe in the period from late October to March here in northern Germany. Then, unfortunately, the sun does not shine very often...

@@SD_Alias youre welcome. each collector consists of 3 vacuum tubes. So the unit in the video is consider 1 collector, which would more than likely be enough. however, on the cloudier days it wouldn't hurt to have a few extra tubes available. Then if it gets too hot just throw on a mixing valve, dump the heat or cover a couple tubes.

are you talking about the valve that is releasing the steam? That is just a 20psi safety valve you would find on and air compressor. Everything coming out of the aluminum shroud, I added so the steam could expand and build pressure, there is nothing special there. The water flows through the concentrator, rather than just through the header and across a bulb like most thermal collectors, which gives us higher temps in the end.

Ok thnx bro

They are a pressure release valve used on hot water heaters there is a channel called green science something that does a lot videos there os a reflective that they sell but going to try something like this to preheat domestic hot water hopefully I can get it built this summer with heating fuel almost $2 a liter Canada

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-kXXOwfZA2Rk.html

There are some sites to check out looking for materials in Canada I think I found something at home dept it think it is used for patio doors to keep heat out

absolutely. Follow the link in the description for more information.

some time ago "they" have already used this for industrial purposes. Somehow the project was shutdown. Probably fossil fuel industries weren't happy...

absolutely! essentially just a solar boiler. There is another video on the channel that is using steam to turn a steam engine which is turning a dc motor that is powering led lights.

hello