This work deals with the evaluation of the performances of phase change materials (PCMs) coupledwith a ventilated ceiling system in order to reduce summer cooling loads and improve the internalcomfort in buildings, thus enhancing the positive effect of night ventilation.Object of the study is the numerical simulation of the thermal behaviour of a typical open space officelocated in three Italian cities during the summer. Indoor climate is only controlled by means of passiveventilation; a usual ventilation system configuration (i.e.
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