As I recalled incorrectly, it was calcium phosphate, so thanks for that.
Particle size was an issue. I've moved on to SkyCool foil:
Quote:
https://www.skycoolsystems.com › technology
Technology - SkyCool Systems
We apply a Dual-Mode film to the top surface of each panel. The film reflects sunlight to prevent the panels from heating up during the day and also emits infrared heat to the cold sky, which keeps the panels and any fluid flowing in them cool 24/7/365. A fluid is pumped through each panel.
Dual-Mode Film
We’ve pioneered radiative cooling as a technology, and shown that specially designed optical films can enable this passive approach to cooling throughout the day. These optical films are highly reflective to sunlight but also emit thermal radiation exceptionally well to the cold of space through our atmosphere, enabling daytime operation during the hottest hours of the day.
Dual-Mode Film serves numerous applications- Applied to outdoor batteries or electronic boxes
- Applied to outdoor shaded structures
- Applied on metal roofs
- Applied to refrigerated trucks or other vehicles
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