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

Hu, Mingke; Pei, Gang; Li, Lei; Zheng, Ren-Hui; Li, Junfei; Ji, Jie

doi:10.1155/2015/807875

Cited by 35 publications

(25 citation statements)

References 15 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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“…We first provide the experimental results as measured from the UV-Visible spectrophotometer and FTIR spectroscopy, which correspond to the solar window of 0.2-2 μm and the atmospheric window of 8-13 μm wavelength intervals. A system with high emissivity in both solar radiation and atmospheric window bands can act as a solar heating system during daytime, and also a radiative cooling system at night time [49,50]. It is effectively an ideal surface for this application; its expected spectrum is shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

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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“…However, these materials still present the limitation that they do not allow solar collection at the same time. In 2015, Hu et al [38] developed a spectral selectivity surface suitable for both solar collection and radiative cooling. The new surface, the TPET, presents high absorptivity/emissivity in both the solar radiation and atmospheric window bands.…”

Section: Introductionmentioning

confidence: 99%

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

et al. 2020

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Climate change is becoming more important day after day. The main actor to decarbonize the economy is the building stock, especially in the energy used for Domestic Hot Water (DHW), heating and cooling. The use of renewable energy sources to cover space conditioning and DHW demands is growing every year. While solar thermal energy can cover building heating and DHW demands, there is no technology with such potential and development for space cooling. In this paper, a new concept of combining radiative cooling and solar thermal collection, the Radiative Collector and Emitter (RCE), through the idea of an adaptive cover, which uses different material properties for each functionality, is for the first time experimentally tested and proved. The RCE relies on an adaptive cover that uses different material properties for each functionality: high spectral transmittance in the solar radiation band and very low spectral transmittance in the infrared band during solar collection mode, and high spectral transmittance in the atmospheric window wavelength during radiative cooling mode. Experiments were performed during the summer period in Lleida (Dry Mediterranean Continental climate). The concept was proved, demonstrating the potential of the RCE to heat up water during daylight hours and to cool down water during the night. Daily/nightly average efficiencies up to 49% and 32% were achieved for solar collection and radiative cooling, respectively.

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

Cited by 35 publications

References 15 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

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

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