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what is the highest temperature a square foot piece of copper painted matte black in direct sunlight can reach.
1 square foot Copper 1 / 16 of an inch thick in the sun painted in matt black which can reach temperatures which is the highest temp and how it can be expressed in watts?
It depends how far from the sun, it is. also depends on what happens on the other side of the plate. Suppose Sun is somewhere in the tropics at the top of a mountain (no clouds, pointing toward the sun, in a bell with transpaent air pumped and sitting superinsulating a brick. In this case, it receives about 1200 watts per square meter of sunlight absorbed and radiated into a hemisphere in a bottom temperature about 4K. (This is not the best you could do if you could put the bell at the bottom of a long hot tube for example, or to sit on the spot over a blast furnace - I presume you get an idea of the max due to radiation exchange with surroundings quasi-natural). Then look at: # 6.1.1 http://www.powerfromthesun.net/Chapter6/Chapter6.htm 20Plate%% 20Absorber to decide if your paint is a matte black Emmitt IR good or bad (you can get absorptivity emissivity values of about 0.95, but higher or slightly lower absorptivity and low emissivity in the infra-red) Once you have weighted emissivity solar absorption (http://www.alibaba.com/product-gs/202724506/Solar_Collector_flat_plate_heat_pipe_.html gives very good numbers) you realize what is the absolute temperature of radiating 1200 watts * absorptivity 4K from a weak body emissivity - Using 90% and 10% absorb issue I get about 660K (about 390C). edit: the temperature can not be expressed in watts. You want to know the temperature of your plate should be to showcase about 1080 watts per m ^ 2 in a black body at low temperature.
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