Investigating the potential for passive cooling of ventilated roof systems in Malta

Abstract

This paper explores the potential for passive cooling by manipulating a traditionally monolithic flat roof structure in Malta. This is investigated by isolating the cast in situ structural concrete slab from the topping screed, typically laid to falls, and ventilating the space. A test rig was set up under laboratory conditions where thermal performance was tested for in summer and winter. Results suggest that there is no significant contribution in winter when vents are kept closed but in summer convective cooling reduces indoor surfaces temperatures, alleviating discomfort conditions in upper floors, thus reducing the demand for cooling.