A field investigation of passive radiative cooling under Hong Kong's climate

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)52-61
Journal / PublicationRenewable Energy
Volume106
Early online date9 Jan 2017
StatePublished - Jun 2017
Externally publishedYes

Abstract

This paper discusses the feasibility of cooling using radiation under Hong Kong’s hot and humid climate. Three different designs of a passive radiative cooler were studied in this work. The three designs include non-vacuum, and vacuum with seven potassium chloride (KCl) IR-Pass windows as well as one system with a single KCl IR-Pass window. The coolers were examined during daytime and night time operation as well as under different sky conditions, such as clear, cloudy and partly cloudy. Investigation was mainly based on the temperature difference between the radiative cooler and ambient air. The experimental results showed that the passive radiative cooler with seven KCl windows and the cooler design without vacuum provided a satisfactory cooling effect at night (i.e. the ambient air temperature was reduced by about 6–7 °C), but the coolers could not produce a cooling effect during daytime under any of Hong Kong’s weather conditions. The same results were obtained for the passive radiative cooler with the single KCl window during daytime operation. However, the cooling capacity of the passive radiative cooler design without vacuum under a clear night sky achieved 38 W/m2.

Research Area(s)

  • Hafnium dioxide, Photonic radiative cooler, Radiative cooling, Silicon dioxide, Thermal radiation

Citation Format(s)

A field investigation of passive radiative cooling under Hong Kong's climate. / Tso, C.Y. ; Chan, K.C.; Chao, Christopher Y.H.

In: Renewable Energy, Vol. 106, 06.2017, p. 52-61.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review