Innovation and progress in the incorporation of phase change materials into radiant floor systems

Research on incorporating Phase Change Materials (PCM) in Radiant Floor Systems (RFS) is experiencing a growing interest, with promising potential for improving buildings' energy efficiency and thermal performance, aiming for carbon neutrality. Among other advantages, PCMs provide the RFS with additional thermal energy storage capacity, allowing it to bridge the mismatch between energy demand and the availability of renewable energy. This paper performs a systematic literature review of the studies published over the last 10 years on PCM incorporation in RFS, aiming to be a valuable contribution for researchers as it identifies the current trends, weaknesses and opportunities on the subject. In detail, concise information is provided, addressing the topics of PCM development and optimisation for RFS, the impact of RFS parameters on its performance, and the benefits of combining PCM-RFS with PCM-containing building components. The novelty of this work is evidenced by the absence of a systematic compilation of scientific literature on the subject, coupled with the rapid evolving nature of PCM research. For RFS applications, the reviewed literature highlights that PCM phase change temperature and layer position are critical parameters for the system's performance, while enhancing the PCMs' thermal conductivity is a current trend of scientific research.