Passive Radiative Cooling (PRC) is an environmentally friendly technology that reduces building cooling electricity consumption by rejecting heat directly into the sky through the atmospheric window. In this thesis, the performance of a Radiant-Capacitive Cooling System (RCCS) has been analyzed through sensitivity analysis and multi-objective optimization, combining experimental measurements with numerical simulations. The RCCS consists of three main elements: Sky Radiators (SRs) for heat rejection to the sky, Radiant-Capacity Modules (RCMs) installed as ceiling panels for indoor cooling, and Thermal Energy Storage (TES) tanks that regulate system operation. These components are connected through a hydronic circuit, allowing the evaluation of passive radiative cooling materials to maintain indoor thermal comfort.