Performance analysis on operation of daytime grating selective passive sky radiative cooling system in building

Passive sky radiative cooling technology has attracted recent interest due to achieve sub-ambient cooling with the advantages of not consuming additional energy and not producing pollutants. However, the practical utility of sky radiative cooling technology in building applications remains under-explored, which requires not only the rational design and integration of the system, but also different control strategies. A novel grating selective passive sky radiative cooling (GS-PSRC) system for building cooling was constructed and five control strategies were used to simulate and analyses the operation of a 50 m2 office building located in Chengdu area during the hottest week of summer in this work. The study shown that the system is able to maintain the average indoor temperature around 20?C during the hottest period and achieve a temperature difference ranging from 3.39-10.77?C, which provides a good cooling capacity. But the excessive outdoor wind speed inhibits the cooling capacity of the GS-PSRC system, which leads to the lower average COP of the system in summer. Its application was further studied across various climate zones. Results indicated the cooling performance of the system mainly be affected by wind speed in different climate zones. Adding wind-blocking devices around radiators is recommended to improve cooling efficiency. This work fully demonstrates the potential application of passive sky radiative cooling technology in building energy efficiency.