On the energy modulation of daytime radiative coolers: A review on infrared emissivity dynamic switch against overcooling

Giulia Ulpiani , Gianluca Ranzi, Kwok Wei Shah , Jie Feng, Mattheos Santamouris

Solar Energy Volume 209, October 2020, Pages 278-301

Abstract

Passive daytime radiative cooling represents one of the boldest answers to tackle the future cooling needs of the built environment and to mitigate urban heat island effects.

Developing a technology heat mitigation plan for one of the world's hottest cities

We are proud to prepare the Heat Mitigation Plan of the capital city of Saudi Arabia, Riyadh. The Royal city of Riyadh will be the first city in the world to  have such an advanced heat mitigation plan based on fully innovative experimental and theoretical techniques as well as on the use of very advanced heat rejection technologies, as developed by our research team and other international colleagues.

Link Article : Heat Mitigation Plan

 

Upscaling of Film Based Elastocaloric Cooling

Giulia Ulpiani, Florian Bruederlin Raphael Weidemann, Gianluca Ranzi, Mat Santamouris, Manfred Kohl

Applied Thermal Engineering, Volume 180, 5 November

  

A new concept of upscaling a shape memory alloy (SMA) film based elastocaloric cooling device is presented by arranging SMA films in parallel to increase the specific cooling capacity at low actuation force, while maintaining the large surface-to-volume ratio needed for rapid heat transfer. Selected materials are cold-rolled TiNiFe films that exhibit maximum adiabatic temperature changes of 27.3 and −18.1 K upon loading and unloading, respectively.

Recent Development and Research Priorities on Cool and Super Cool Materials to Mitigate Urban Heat Island

M. Santamouris and Geun Young Yun

Renewable Energy

161 (2020) 792e807
 

The urban heat island is increasing the temperature of cities up to 10 _C and has a very important impact on energy, environmental quality and health. Materials used in the building and urban fabric affect the urban thermal balance and contribute highly to urban overheating. The article presents the progress achieved on the design, development and implementation of mitigation materials presenting a low and very low surface temperature. The recent technological progress and developments concerning natural, light colour, IR reflective, PCM doped, thermochromic, fluorescent, photonic and plasmonic materials is presented.

On the Energy Potential of Daytime Radiative Cooling for Urban Heat Island Mitigation

Laura Carlosena , Alvaro ´ Ruiz-Pardo , Jie Feng , OlatzIrulegi, Rufino J. Hernandez-Minguill , Mattheos Santamouris: , Solar Energy, Volume 208, 15 September 2020, Pages 430-444

The objective of this paper is to present the potential of daytime radiative cooling materials as a strategy to mitigate the Urban Heat Island effect. To evaluate the cooling potential of daytime radiative cooling materials, 15 theoretical materials and seven existing materials were simulated: two radiative cooling materials, a coolmaterial, two white paints, a thermochromic paint and a construction material. The novelty of this study is that it shows that the optimal spectral characteristics of radiative cooling materials depending on the climate conditions and the type of application.

Experimental evidence of the multiple microclimatic impacts ofbushfires in affected urban areas: the case of Sydney during the2019/2020 Australian season

Giulia Ulpiani,
Gianluca Ranzi and Mat Santamouris

This paper presents the results of a monitoring campaign conducted in the inner west of the city ofSydney during the 2019/2020 bushfire season. The combined effects of extreme pollution, heat wavesand droughts are analyzed in terms of microclimatic perturbation.

Study sheds light on bushfires' microclimate impact

A study examining the urban microclimatic impact of the 2019-20 Australian bushfires has uncovered how they affect local meteorological and air quality.

Its findings could help understand the potential consequences of an increased rate and extension of bushfires, and especially regarding improving risk preparedness and coping strategies.