What the Flux? 392 MW generated from steam turbine generators/30% Rankine Efficiency/85% heat transfer efficiency @ solar boiler/90% mirror efficiency = 1700 megawatts airborne flux, THAT IS A GOOD BIRD ZAPPER
On Thu, Apr 10, 2014 at 10:04 AM, Jed Rothwell <jedrothw...@gmail.com>wrote: > See: > > > http://www.renewableenergyworld.com/rea/news/article/2014/04/concentrating-solar-power-under-fire-glaring-planning-oversight-or-easily-remedied-issue > > QUOTES > > [Clifford Ho of Sandia National Laboratories' Concentrating Solar > Technologies Department says] "I believe some of the glare that's being > viewed is taking place when the heliostats are in a standby mode." > > During peak daylight hours, it is common for a number of heliostat mirrors > to be taken offline to prevent heliostats from directing more thermal > energy to the turbine than it is capable of receiving. Ho said that during > standby, these heliostats are focused on aim points next to the receiver, > forming a ring of glare above the tower. > > According to Ho, the sunlight reflected from heliostats that are in > standby mode could be having an exacerbating effect on the amount of > reflection being emitted. > > In examining photos of the glare taken by passengers flying over the > Ivanpah plant, Ho said it's apparent to him the intense light is emanating > from the heliostats not in use. "You can clearly see the difference between > what's just the diffuse reflection from the towers versus one or more > heliostats that are in standby mode and reflecting light toward the > observer." > > Ho has performed helicopter surveys of heliostats in standby mode at > Sandia National Laboratories' National Solar Thermal Test Facility. "It's > bright," he said, emphasizing that the Sandia CSP array is much smaller > than that of Ivanpah. "When you're close, it can be like looking into the > sun." > > . . . One possible solution, as suggested by Ho, is to reposition > heliostats that are in standby mode so that they stand vertically -- thus > reflecting the glare toward the ground instead of upward. > > > - Jed > >
