Solar Concentrator

Direct steam generation in a solar concentrator. Deflection of steel tube is caused by a circumferential temperature gradient generated by the stratified water flow, logitudinal mechanical loads are not present. Experiment was made at nearly atmospheric presure in Mexico City. Any coments and ideas are welcome

Category:

Howto & Style

Tags:

• solar
• concentrator
• stratified
• flow
• steam
• generation

[freak869]

Alberto

Cual es el material reflectivo que estan utilizando, cual es la distancia focal? tienes mas videos?

donde estan haciendo las investigaciones de esta tecnologia, o donde se puede encontrar mas informacion sobre los concentradores solares

Saludos

[dongatito]

Hola,

Se trata de la antigua planta solar experimental del I de I de la UNAM, el proyecto ha sido dirigido por el Dr. Rafael Almanza. Este es un experimento cuando se intentaba generar el vapor dentro de los mismos tubos; ahora, en otro proyecto, estamos calentando el agua presurizada a 40 bar para despues intercambiar agua-agua y generar el vapor en un domo. Los espejos que ves son de película 3M autoadherible y la distancia focal es de 62.5cm con espejos e 2.5 m de apertura

[oswald211]

how much pressure does this module create

[dongatito]

Thanks Oswald,

Water feeding is made from a 3m high tank, tube is open at it´s end. So pressure is not the cause of the bending; we believe that bending is caused in the 2 phase stratified region where water HTC is greater than that of steam. We have not made pressure meassures yet.

[nwilke]

The output with oil was only 10kw? Are there 16 modules each 15 meters long? As in 240 meters long for 10kw? If that were the case, this system is only about 1% efficient. 2.5m x 15m long x 16 units = 600 sq m x 1.36kw/sq m = 816 kw available 10kw/816kw=1.2% effficient

[dongatito]

You´re right on target, we got 1 to 2% overall efficience. We leaved the project of generating electricity because of the scarcity of founds and we focused our attention in building specular parabolic surfaces and testing materials with Direct Steam Generation (DSG). Personally I have worked these two topics. Soon I will upload another video, not as spectacular like this but perhaps more ilustrative of the 2 phase problem. By the way, are you a professor? maybe german, spanish? Regards

[advthinker]

(0) if the gap on r/r tracks was not there, across country tract set would exspand 10 miles out into the bay. looks like a question of balance, in this case. the heat sorce is only on one side. and this is the cause of this problem. a pyrex glass tube, mirrored on the inside 180 degrees, will focus a light line on the back side of the tube. heating it evenly. if evcated the all the heat will stay on the tube. but still will grow in it lenght. i built a collector, and just in day sun got 210.F.

[mecatronix87]

que tipo de tubo estan usando¿

[rayofminneapolis]

capacitate all day. 2010

[nwilke]

sounds like soulsearcher has a decent budget to work with. maybe the poster doesn't have as much? i don't know. it would be useful to know what the budget is. of course, if the sky is the limit, there would be evacuated tubes housing black ceramic pipes. most places use water or refrigerant for the heat exchange fluid. pressure isn't as much of an issue there maybe? the housing never has to see the light of day, so you can reinforce the entire turbine loop with a ton of cheap, thick stuff?

[pupplesan]

Molten sodium metal may be the best bet. I suspect you know this.

[soulsearcher009]

We're working on a solar concentrator that's well above 1200c. Our material selection is a bit more exotic with ceramics involved. The problem is finding a suitable heat transfer fluid. Even with the exotic materials our design is very cost effective and a great deal less space required for the same energy output.