Field investigation of a photonic multi-layered TiO2 passive radiative cooler in sub-tropical climate

By S. Y. Jeong, Chi Yan Tso, J. Ha, Yuk Ming Wong, Christopher Y. H. Chao, Baoling Huang, H. Qiu. Renewable Energy, 2020

149 citations recorded by the source corpus.

Abstract Cost reduction and enhanced cooling performance are strongly demanded for daytime passive radiative cooling due to its attractive cooling strategy that does not require any energy input. Its potential application varies widely from air conditioning systems for buildings, photovoltaic cells, electronic device cooling and automobiles. However, recently proposed daytime passive radiative coolers are based on photonic structures which are high in cost. A relatively cheap metal oxide material, TiO2, which lowers the cost but is highly emissive in the mid-infrared range has been used, also improving the cooling performance of the photonic daytime passive radiative cooler. An optimized TiO2–SiO2 alternating multi-layered photonic daytime radiative cooler with average emissivity of 0.84 within 8–13 μm while reflecting 94% of incident solar energy is developed. Its net cooling power is estimated to be 136.3 W/m2 at ambient air temperature of 27 °C which shows an improvement of 90 W/m2 compared to that of the HfO2-SiO2 photonic radiative cooler. Last, a field test has been conducted in Hong Kong's subtropical climate (i.e. relative humidity = 60–70%) to investigate its feasibility, and with the help of solar shading, successfully demonstrated temperature reduction of 7.2 °C with a net cooling power of 14.3 W/m2 under direct sunlight.

Subfields: Atomic and Molecular Physics, and Optics, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/fade9258b562a69c38cbd3b2613d6e71f48ebdc2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

Hongchen Ma
Kaiqiang Yao
M. Xiao
Jiupeng Zhao
Yao Li
Haipeng Zhao
Liang Wang
Mingguang Dai

Citations in the corpus

Multilayered SiO2/Si3N4 photonic emitter to achieve high-performance all-day radiative cooling (2020, background): “3 C have been recently reported for the multilayer coolers [23,24], the measurements were performed in a hot cavity formed by the solar-reflective walls, which inevitably increases the temperature drop due to a higher reference ambient”