Passive Cooling Against the (Night) Sky

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Ron Zevenhoven, Martin Fält
Publication year: 2014
Journal: Journal of Sustainable Research in Engineering
Journal acronym: JSRE
Volume number: 1
Issue number: 1
Start page: 49
End page: 54
eISSN: 2409-1243


This paper summarises R&D work that evolved towards the design of a smart skylight (roof window) aiming at keeping its inside compartment at a lower temperature than the surroundings. A skylight that gives maximum cooling (summer) or insulating (winter) performance is being optimised at Åbo Akademi University for conditions in (northern) Europe. As passive cooling through long-wave (LW) thermal radiation must counteract incoming short-wave (SW) thermal radiation, a drawback to that region is the length of daytime during summer. For equatorial locations like Kenya the use of a passive cooling skylight would benefit from the more constant duration of night-time and temperature. Depending on location for application, a two- or morewindowed skylight must be designed. Results presented include the modelling of skylight windows using a four-band thermal radiation model and Comsol Multiphysics software for simulation. Several cases show that very significant increases in (passive) cooling heat output can be achieved.


Radiative cooling, Sky, Thermal radiation

Last updated on 2020-05-08 at 07:48