Effectiveness of a night radiative cooling system in different geographical latitudes

Experimental Study of the Heat Flow and Energy Consumption during Liquid Cooling Due to Radiative Heat Transfer in Winter

“…On average, over the observation period, the heat flux from the radiator was about 31 W•m −2 at a temperature of the radiating surface of −5 • C. This was less than the theoretical maximum value [12,16], which, if heat was rejected only from the upper side of the radiator, could average about 80-90 W•m −2 . Accordingly, the thermal resistance of the radiator had a significant impact on the outflowing heat flux.…”

“…In paper [12], a theoretical calculation of the amount of heat that can be dissipated due to radiation and convection from the surface of the radiator was made. In the coldest months of the year (January and February) in the climate of Astana City (Kazakhstan) at a temperature of the radiating surface of −10 • C, 39.7 W•m −2 was rejected, on average, from 1 m 2 .…”

“…This work is a continuation of [16] and is necessary for the development of a refrigeration system for fruit storage. A review of the literature [5][6][7][8][9][10][11][12][13][14][15][16] showed that the study of RC heat transfer processes in winter is based on theoretical models, the correctness of which is confirmed only for the warm period of the year. In winter, however, there is a possibility that the process of ice formation on the surface of the radiator, an increased level of cloudiness and dust content in the air can have a significant impact on RC.…”

Modelling of the operation of a refrigeration unit using radiative cooling to maintain the storage temperature in the cold room

“…Radiative cooling (hereinafter referred to as RC) -is a method of producing cold, based on the release of heat in the form of infrared radiation through the Earth's atmosphere into the surrounding space (Zhao, Xu et al, 2019;Ahmad et al, 2019;Vall and Castell, 2017;Hossain et al, 2016). It was previously suggested that in a sharply continental climate with cold winters, RC can be used to maintain the temperature of the cooled object around 0°C and lower (Tsoy et al, 2017;Tsoy et al, 2015), while most of the research is currently underway on the use of RC in summer air conditioning systems (Zhao, At the same time, it can be assumed that the use of combined RC systems together with vapor compression refrigeration machines will reduce energy consumption and may also lead to a reduction in the use of ozone-depleting substances and greenhouse gases, which are currently limited in use (Bolaji and Huan, 2013;Tassou and Ge, 2008 ). Only a small number of studies have been carried out to study the possibilities of using RC in winter in the northern regions of the planet (Karagusov, Goshlya et al, 2018;.…”

A Pragmatic Bilayer Selective Emitter for Efficient Radiative Cooling under Direct Sunlight

“…The efficient radiative cooling devices are expected to have near unity infrared (IR) emissivity within 8 to 14 μm, which is known as the atmospheric window, in order to transfer the heat directly to outer space [3,4,5,6]. The significant radiative cooling at night by the selective emitters was achieved in previous works [7,8,9]. The daytime radiative cooling, however, is still a great challenge since solar energy is absorbed intensively by these emitters, which generates massive heat on the surface of the emitters [2,10].…”