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Investigation of a radiative sky cooling module using phase change material as the energy storage

Kiyaee, Soroush; Khalilmoghadam, Pooria; Behshad Shafii, Mohammad; Moshfegh, Alireza Z.; Hu, Mingke

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Soroush Kiyaee

Pooria Khalilmoghadam

Mohammad Behshad Shafii

Alireza Z. Moshfegh

Mingke Hu


Radiative sky cooling (RSC) systems have enjoyed a privileged position in the research community due to generating cooling energy without consuming electricity using the open atmospheric window and infrared emission to the sky. However, the system's justification occurs when it reaches a temperature below the minimum 24-hour ambient temperature. This study utilizes phase change materials (PCM) as the energy storage of a hybrid daytime photovoltaic-thermal and nighttime RSC module and investigates the nocturnal cooling energy-saving potential of the system at different phase transition temperatures. After being validated by the experimental data in the literature, the simulated model was used for examining the exergy and energy efficiencies of PCMs with varying phase transition temperatures. The comparison of the exergy efficiency in the radiative sky cooling systems was performed for the first time, revealing the simultaneous effect of the temperature drop and cooling power to specify the optimal operative point of the system. Based on the climatic conditions of the simulation site, the PCM with phase transition temperatures of 18 °C revealed the peak and average exergy efficiencies of 42.8% and 33.7%, respectively. Likewise, the 23 °C PCM recorded the maximum cooling power of about 49.9 W/m2, and the 15 °C PCM achieved the highest temperature drop of about 14.8 °C.

Journal Article Type Article
Acceptance Date May 25, 2022
Online Publication Date Jun 1, 2022
Publication Date Sep 1, 2022
Deposit Date Jul 15, 2022
Publicly Available Date Jul 15, 2022
Journal Applied Energy
Print ISSN 0306-2619
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 321
Article Number 119357
Keywords Management, Monitoring, Policy and Law; Mechanical Engineering; General Energy; Building and Construction
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