Radiative cooling (RC) is attracting more interest from building engineers and architects. Using the sky as the heat sink, a radiative cooling material can be passively cooled by emitting heat to the sky. As a result of the development of material technology, RC research has been revived, with the aim of increasing the materials’ cooling power as well as finding reliable ways to utilize it in cooling for buildings. This review identifies some issues in the current implementation of RC technologies in buildings from an architectural point of view. Besides the technical performance of the RC technologies, some architectural aspects, such as integration with architectural features, aesthetic requirements, as well as fully passive implementations of RC, also need to be considered for building application. In addition, performance evaluation of a building-integrated RC system should begin to account for its benefit to the occupant’s health and comfort alongside the technical performance. In conclusion, this review on RC implementation in buildings provides a meaningful discussion in regard to the direction of the research.

Modern buildings in Indonesia rely mostly on artificial lighting, heating, cooling and ventilation. It means more energy is used to drive mechanical appliances, and presumably not sustainable. Meanwhile modern buildings consume much energy, traditional architectures are known as the source of knowledge for sustainable, energy efficient and climate responsive design. Noticeably, one of the differences between modern and traditional buildings in Indonesia is shown in their strategy to provide thermal comfort to the user. Traditional buildings use natural ventilation, but modern buildings use mechanical air conditioning. By focusing on wind-driven ventilation, the study aims to investigate natural ventilation strategy of Indonesian traditional house, and their potential improvement to be used in modern Indonesian buildings. Three traditional houses are studied in this research, representing west, central, and east Indonesia. The houses are Lampung traditional house, Javanese traditional house, and Toraja traditional house. CFD simulation is conducted to simulate wind-driven ventilation behaviour and the temperature of the buildings. Concisely, the wind-natural ventilation of case study houses is potential to provide thermal comfort inside the houses. However, the strategy still can be optimized by adding some other passive design strategies: sun-shading; vegetation; or buildings arrangement in the traditional dwelling. Consideration about the roof's shape and windows position to the roof is important as well to create a uniform air distribution.

Natural ventilation strategy is considered as one of strategy needed in sustainable buildings. Ventilation strategies can be classified by its driving force, wind-driven ventilation and buoyancy-driven ventilation. In Indonesia, which has a hot and humid climate, the traditional ventilation designs are mostly wind-driven ventilation. However, the natural ventilation strategy presumably does not work well in hot-and humid climate due to low wind speed in the environment. Thus, the buoyancy-driven strategies should be developed, but because of the strategy is established in the temperate climate, its implementation to the hot and humid climate needs more investigation. By learning from what has been developed in other climatic region, this study is aimed to investigate the potential of the buoyancy-driven ventilation strategy to the hot and humid climate. The research was a quantitative research that employs Computational Fluid Dynamics. Two conditions of the school building were simulated: the condition of without chimney and with chimney. The results showed that solar chimney can increase average wind speed inside the building. However, its performance in elevation 1 m and 1.5 m was below the performance of building without chimney. The phenomenon suggested that solar chimney in building created higher air velocity in elevation that higher than seating and standing position of elementary school children, 1 m and 1.5 m, although it improved room air velocity average.