A robust convection cover material for selective radiative cooling applications

Bathgate, Stephen N.; Bosi, S.

doi:10.1016/j.solmat.2011.05.027

Cited by 70 publications

(27 citation statements)

References 14 publications

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“…The phenomenon that objects on the surface of the earth obtain a cooling power by radiating heat to outer space through the atmospheric window is called spectrally selective radiative cooling (short for "radiative cooling" in the followings) [22] . Radiative cooling technology has also attracted the attention of a growing number of researchers in recent years because of its advantages in energy conservation and emission reduction [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] . Radiative cooling systems are simple, making them easily well-integrated with building envelopes.…”

Section: Introductionmentioning

confidence: 99%

Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

et al. 2016

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A type of composite surface was manufactured for trial to achieve integrated solar heating and radiative cooling functions. The spectral properties of the composite surface present a relatively clear selectivity in the spectra of solar heating and radiation cooling wavelengths. A combined system for both solar heating and radiative cooling (named SH-RC system) based on the composite surface was mounted together with a traditional flat-plate solar heating system. Comparative experiments were carried out to investigate their thermal performances both at daytime and nighttime. Results showed that the composite surface has a relatively evident spectral selectivity. In diurnal collector testing mode, the thermal efficiency of the SH-RC collector was 62.7% at zero-reduced temperature, which was about 86.4% of that of the traditional flat-plate solar heating collector. In nocturnal collector testing mode, the SH-RC collector had net radiative cooling powers of 50.3 W/m 2 on a clear night and 23.4 W/m 2 on an overcast night; by contrast, the traditional flat-plate solar heating collector exhibited very little radiative cooling capacity. In diurnal system testing mode, the daily average thermal efficiency of

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Section: Introductionmentioning

confidence: 99%

Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

et al. 2016

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“…Many researchers focused on other durable materials. Zinc sulphide has been found to be a quite durable and suitable material which performs thermally close to polyethylene by Bathgate and Bosi [16]. But they also suggest that a much cheaper way for manufacturing large zinc sulphide tiles needs to be developed in the future.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of Spectral Selectivity Surface for Both Solar Heating and Radiative Cooling

Pei

et al. 2015

International Journal of Photoenergy

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A spectral selectivity surface for both solar heating and radiative cooling was proposed. It has a high spectral absorptivity (emissivity) in the solar radiation band and atmospheric window band (i.e., 0.2∼3 m and 8∼13 m), as well as a low absorptivity (emissivity) in other bands aside from the solar radiation and atmospheric window wavelengths (i.e., 3∼8 m or above 13 m). A type of composite surface sample was trial-manufactured combining titanium-based solar selective absorbing coating with polyethylene terephthalate (TPET). Sample tests showed that the TPET composite surface has clear spectral selectivity in the spectra of solar heating and radiation cooling wavelengths. The equilibrium temperatures of the TPET surface under different sky conditions or different inclination angles of surface were tested at both day and night. Numerical analysis and comparisons among the TPET composite surface and three other typical surfaces were also performed. These comparisons indicated that the TPET composite surface had a relative heat efficiency of 76.8% of that of the conventional solar heating surface and a relative temperature difference of 75.0% of that of the conventional radiative cooling surface, with little difference in cooling power.

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“…Silicon oxide, which is essentially glass, is also suggested to be used as a possible radiative cooler; its properties as a selective radiator and corresponding power of cooling were reported [60]. In Table 3, the power of cooling of silicon oxide is compared to the moss sample, which had the highest power of cooling in this study.…”

Section: Power Of Cooling Calculated For Constant Temperaturementioning

confidence: 94%

“…The first and the third properties, are taken as constants in this study. Therefore, the only variable that affects the power of cooling is the spectral emissivity of different samples, which is related to the nature of the material [60]. As shown in Figure 12, there is a sharp increase in the spectral absorption coefficient for moss at wavelengths longer than 11 µm, which could be related to cutin [58].…”

Section: Power Of Cooling Calculated For Constant Temperaturementioning

confidence: 99%

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Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Family¹,

Mengüç²

2018

Sustainability

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The main goal of this paper is to explore the radiative cooling and solar heating potential of several materials for the built environment, based on their spectrally-selective properties. A material for solar heating, should have high spectral emissivity/absorptivity in the solar radiation band (within the wavelength range of 0.2–2 μm), and low emissivity/absorptivity at longer wavelengths. Radiative cooling applications require high spectral emissivity/absorptivity, within the atmospheric window band (8–13 μm), and a low emissivity/absorptivity in other bands. UV-Vis spectrophotometer and FTIR spectroscopy, are used to measure, the spectral absorption/emission spectra of six different types of materials. To evaluate the radiative cooling potential of the samples, the power of cooling is calculated. Heat transfer through most materials is not just a surface phenomenon, but it also needs a volumetric analysis. Therefore, a coupled radiation and conduction heat transfer analysis is used. Results are discussed for the selection of the best materials, for different applications on building surfaces.

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A robust convection cover material for selective radiative cooling applications

Cited by 70 publications

References 14 publications

Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

Theoretical and Experimental Study of Spectral Selectivity Surface for Both Solar Heating and Radiative Cooling

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

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