hecd2
Master Poster
- Joined
- Oct 3, 2013
- Messages
- 2,071
OK let's run the numbers for 15cm diameter and 3000K. That results in a total power output of about 325kW, and assuming a surface area of 1m2 for the PV array, we have an incident power density of 325kW/m2 or about 230 times more than an array in the solar application. The maximum power density at the focus of a 1000 sun system is 325MW/m2.I still feel your analogy is meaningless given we are talking about a dense receiver array that will be cooled using an active cooling solution. My point in bring up the passive abilities of the chips was simply to demonstrate they are capable of dealing with megawatt power levels without melting. Active cooling solutions, such as jet impingement/micro-channel cooling, are capable of dealing with the heat build up. I never said BrLP planned on using a passive cooling solution.
Just eye-balling it, the diameter of the dome is closer to 15 cm rather than 25. You can get a good look at it here: https://www.youtube.com/watch?v=omUSfYuVT1c
BrLP plans on running it at 3000K for the first build outs.
At 3000K (peak of the BB spectrum at about 966nm in the medium IR) only 26kW or about 8% is in the visible and so the top layer (biggest bandgap) of the multijunction cell will be generating very little energy. Across 400nm to 1100nm you have only 1/3 of the energy or about 110kW. The electrical efficiency will be below 40%, so this cell will produce about 30kW electrical power with a following wind and you'll have to deal with 300kW of waste heat by, what you now claim, would be active cooling. It makes no sense.