How can optics be used to improve refrigeration efficiency and reduce costs?

[skyfridge]

Hello all,

I'm interested in applying science to different aspects of living off the grid and generally saving money in areas of heating, cooling and refrigeration. My current project is engineering a passive refrigerator that achieves refrigeration by applying optics to minimize heat input for radiative cooling between a radiator and the sky.

 

[berkeman]

Welcome to the PF!