In reply to Bob Higgins's message of Sun, 7 Feb 2016 13:56:42 -0700: Hi, [snip] >If you look at the chart on slide 49, where shows the measured spectrum, he >also says that the power integrated over 4pi steradians is 527kW (sounds a >little like a Lugano measurement, but lets take it initially at face value). >If that is true that 527kW of radiant energy is produced, with the estimated >input of 46.6kW, that would mean he is realizing a HEAT COP of about 11. Now, >if you figure that 50% of that heat goes into heating the tungsten plate that >is converting the heat energy into a blackbody suitable for the solar cells >(optimistic), and the solar cells are 30% efficient, then you get a net >electrical COP of 1.7. So, if you hooked the electrical back to the input to >get it to self-sustain, you get a remaining electrical output of 0.7 x 46.6kW, >which is 33kW of net electrical power output from the self-sustaining device.
If the heat is used for hot-water/central heating, then that's actually not a bad ratio. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
