I need to achieve 500 Celsius. Can that temperature be achieved by concentrating sunlight using magnifying glass?
You should use a parabolic dish. I use one with my students in engineering. It is 10 square meters large. I am able to fuse aluminum by clear weather so that this kind of device is definitely able to reach 500°C.
The max. Temperature is 5800 degrees. That is the surface temperature of our sun.
You can use concave/convex mirrors to concentrate sun's rays to achieve higher degree of temperatures more than normal. For this you have to refer manuals/literature for details.
You have not mentioned about the size of the magnifying glass to be used.
But as such it would be difficult to reach 500 degree C using a magnifying glass
I have used a Solar Concentrator Parabolic dish (SK 14) and the temperature available at the focal point was close to 210 degree C.
If a parabolic dish of larger size is used and the focal point is well insulated then temperatures in the range of 300 degree C could be achieved.
Testing this practically was not possible due to limitations of the materials used and the measuring instruments.
I would try a mirror not a glass. The glass will absorb too much IR and you won't get the temperatures you are seeking.
You should use a parabolic dish. I use one with my students in engineering. It is 10 square meters large. I am able to fuse aluminum by clear weather so that this kind of device is definitely able to reach 500°C.
If sunlight is concentrated as heat the Second Law of Thermodynamics puts the maximum temperature that can be achieved by concentrating sunlight as the temperature of the Sun's photosphere, 5800 K. If sunlight is concentrated via work there is in principle no limit (except perhaps the Planck temperature 10^32 K). Thunderstorms concentrate solar energy (albeit inefficiently) via work rather than heat and typically generate 30000 K lightning bolts (the strongest lightning bolts may be even hotter). The Sun's corona is heated via work by the Sun's 5800 K photosphere to a few million K. The LHC ultimately operates on solar energy, and concentrates it via work to 10^17 K (near-Big-Bang temperatures). Whether concentrated via heat or work of course the maximum flux is the solar input of slightly over 1 kW/m^2.
With an average efficiency of 15%, a square yard of solar photovoltaic cells (PV) would produce (5 kilowatt-hours of solar energy multiplied by 15% =) .75 kilowatt-hours of electric energy per day. Solar panels (PV) covering an area ten yards by ten yards (100 square yards or 900 square feet) would produce 100 x .75 = 75 kilowatt-hours of electricity per day.
Concentrated solar power (CSP) systems can achieve 30% efficiency, or about twice the efficiency of standard photovoltaic cells (2 x .75 = 1.5 kilowatt-hours per square yard per day).
Hope this helps answer your question.
Professor Yehia Khalil
Yale University
USA
You can reach high temperatures as 500oC, in the case that you design a proper absorber. In order to do this, design a small absorber and put it inside a housing with cover. If you have a good receiver, teh thermal losses will be low and this temperature level can be reached. Try to design in concentration ratios over 40, maybe 100.
The concentrator in Font-Romeu-Odeillo-Via (France) reaches a max. temperature of 3600 degrees. The absolute maximum is 5800 degrees, limited by the surface temperature of our sun.
https://de.wikipedia.org/wiki/Font-Romeu-Odeillo-Via
With an inexpensive homemade parabolic dish mirror (built up using a commercial polymeric aluminised membrane, for instance), you can get with ease temperatures close to 1000°C, much above the 500°C you desire. If you choose a plane absorber (the place where you want to reach the high temperture value), the optimum rim angle for your parabolic dish is 45°. Please try to diminish heat looses by convection and conduction in order to reach higher temperatures. The theoretical limit in the temprature you can get with an ideal parabolic dish is "only" 3830°C. You can get even higher temperatures by employing non-imaging optics with two-stage concentrators.
About 740MW heat is commercially produced by concentrating solar radiation, but it can be still increased based in the need
Parabolic trough receiver may be the option where reported absorber tube temperature is 450 Deg.
It can reach 900 degrees Celsius.
https://researchspace.ukzn.ac.za/handle/10413/5091
Yes, I think the combination of a mirror prism model at the focal length of a concentrating can produce temperatures near to 500 ° C in a given time period. Of course, this system must be modeled
500 degree is not a difficult task to achieve by either a magnifying glass (lens), a Fresnel lens or a parabolic mirror. The most important issue is to attain adequate amount of "solar concentrations". Direct terrestrial solar flux without any concentration may reach 1mW/mm2. After being concentrated by an optical component, you may reach even 16W/mm2 (about 3500 degrees). So, please only make sure that your magnifying glass does not have significant aberrations. An aspheric lens may provide a much more satisfactory result than "toy-like" glasses.
Please can i use the aspherical lens from a damaged camera for solar heating?. If yes, like how many degrees?
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