Abstract
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.
Highlights
Global warming forces buildings to consume more energy for cooling
There have been many high-performance Radiative cooling (RC) materials that resulted from the experimentations
Research on colored and transparent RC materials could widen the application of RC in buildings
Summary
Global warming forces buildings to consume more energy for cooling. For buildings in urban areas, they experience the so-called urban heat island (UHI), and this increases the cooling demand even more in the warm and hot climate region [1]. Many proposals for the implementation of RC in buildings are still in the stage of research and development, and they are mainly about the emitter material or the use of RC to assist active cooling technology [17]. These challenges remain further research topics in the RC field. This review offers to fill in the gap by analyzing the current development of RC technology in buildings from an architectural point of view and proposes some possible research direction of passive RC application in buildings. The review is arranged in six sections with the main content, besides the introduction and conclusions, describing RC principles, its state-of-the-art application in buildings, the architectural features that are involved in current applications, and an outlook for architectural application of passive RC
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