So, for the surface that's doing the cooling, it needs to be able to face the sky. And during the middle of the day, when we might want something cold the most, unfortunately, that means you're going to look up to the sun.
Para que la superficie que se enfríe, necesita poder mirar al cielo Y durante la mitad del día, es cuando es posible que más deseemos algo frío, desafortunadamente, eso significa que mirarás al sol.