Strictly defined, the term ‘passive cooling’ applies only to those processes of heat dissipation that will occur naturally, that is without the mediation of mechanical components or energy inputs. The definition encompasses situations where the coupling of spaces and building elements to ambient heat sinks (air, sky, earth and water) by means of natural modes of heat transfer leads to an appreciable cooling effect indoors. However, before taking measures to dissipate unwanted heat, it is…