Approach to fabricating high-performance cooler with near-ideal emissive spectrum for above-ambient air temperature radiative cooling

Gao, Mengyu; Han, Xuefei; Chen, Fei; Zhou, Wenjie; Liu, Pian; Shan, Yao; Chen, Yao; Li, Jing; Zhang, Rongjun; Wang, Song-You; Zhang, Qinghong; Zheng, Yu‐Xiang; Chen, Liang‐Yao

doi:10.1016/j.solmat.2019.110013

Cited by 25 publications

(22 citation statements)

References 47 publications

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“…It is worth noting that the radiative cooling coating showed a temperature reduction of 4 ± 0.5 • C in the nighttime. Compared with the recently published radiative cooling material based on PET substrates [10], the radiative cooling coating proposed in this work shows a better cooling performance, and is easier to fabricate at a much lower price for commercial availability.…”

Section: Introductionmentioning

confidence: 96%

“…If an efficient radiative material can be applied to the market for large-scale application (for example, buildings, curtains, and tents), the following characteristics should be exhibited [10,11]: (1) it has a near-ideal emittance profile, (2) it has a good cooling effect, (3) the substrate should be rigid or flexible, (4) it can be put into extensive production, and (5) the price is affordable.…”

Section: Introductionmentioning

confidence: 99%

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A Pragmatic and High-Performance Radiative Cooling Coating with Near-Ideal Selective Emissive Spectrum for Passive Cooling

Chen

Tao

et al. 2020

Coatings

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Radiative cooling is a passive cooling technology that can cool a space without any external energy by reflecting sunlight and radiating heat to the universe. Current reported radiative cooling techniques can present good outside test results, however, manufacturing an efficient radiative material which can be applied to the market for large-scale application is still a huge challenge. Here, an effective radiative cooling coating with a near-ideal selective emissive spectrum is prepared based on the molecular vibrations of SiOx, mica, rare earth silicate, and molybdate functional nanoparticles. The radiative cooling coating can theoretically cool 45 °C below the ambient temperature in the nighttime. Polyethylene terephthalate (PET) aluminized film was selected as the coating substrate for its flexibility, low cost, and extensive production. As opposed to the usual investigations that measure the substrate temperature, the radiative cooling coating was made into a cubic box to test its space cooling performance on a rooftop. Results showed that a temperature reduction of 4 ± 0.5 °C was obtained in the nighttime and 1 ± 0.2 °C was achieved in the daytime. Furthermore, the radiative cooling coating is resistant to weathering, fouling, and ultraviolet radiation, and is capable of self-cleaning due to its hydrophobicity. This practical coating may have a significant impact on global energy consumption.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

A Pragmatic and High-Performance Radiative Cooling Coating with Near-Ideal Selective Emissive Spectrum for Passive Cooling

Chen

Tao

et al. 2020

Coatings

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“…Thus, the operating temperatures of outdoor silicon solar panels may increase up to 50–55 °C [ 3 ]. Increased operating temperatures have adverse effects both on performance and reliability of CSSC: the relative efficiencies decrease by 0.25–0.45% with an increase in operating temperature of 1 °C [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ], and the aging rate doubles when the operating temperature increases 10 °C [ 3 , 5 , 8 ]. Therefore, an attractive approach to increase conversion efficiencies and lifetimes of CSSC is to reduce the operating temperature through active and passive cooling methods.…”

Section: Introductionmentioning

confidence: 99%

“…CSSC can be cooled by a spectrum-selective mirror through the following steps: the spectrum-selective mirror is irradiated by incident solar light; light with a wavelength range of 0.3–1.1 µm will be reflected onto CSSC and further generate electron–hole pairs, while light with a wavelength range of 1.1–2.5 µm will transmit spectrum-selective mirror and thus prevent CSSC from self-heating. Because a sky-facing terrestrial object can achieve the radiative cooling effect by adding radiative layers, a radiative cooling layer is placed on the sunlight-facing side of solar cells [ 3 , 5 , 6 , 7 , 8 , 9 , 30 , 31 , 32 , 33 ]. However, the radiative cooling layers could easily affect the light absorption of solar cells, and it is hard to optimize radiative cooling and selective-absorptive cooling effects at the same time.…”

Section: Introductionmentioning

confidence: 99%

“…With the effect of radiative cooling and selective-absorptive cooling, CSSC was efficiently cooled both under strong and weak non-radiative cooling conditions. cooling layer is placed on the sunlight-facing side of solar cells [3,[5][6][7][8][9][30][31][32][33]. However, the radiative cooling layers could easily affect the light absorption of solar cells, and it is hard to optimize radiative cooling and selective-absorptive cooling effects at the same time.…”

Section: Introductionmentioning

confidence: 99%

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The Design of Near-Perfect Spectrum-Selective Mirror Based on Photonic Structures for Passive Cooling of Silicon Solar Cells

Gao

Xia

et al. 2020

Nanomaterials

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When exposed to sunlight, crystalline silicon solar cells (CSSC) will not only generate electric energy but are also heated by solar radiation. Such a self-heating effect makes the working temperature of CSSC 20–40 °C higher than that of the ambient temperature, which degrades their efficiency and reliability. The elevated operating temperatures of CSSC are mainly derived from absorbing photons that cannot be converted to electrons. Therefore, it is important to prevent CSSC from absorbing useless solar light to have a better cooling effect. In this paper, photonic structures based spectrum-selective mirror is designed to cool the operating temperatures of CSSC passively. The mirror could make CSSC absorb about 93% of the sunlight in the wavelength range of 0.3 to 1.1 µm and only absorb about 4% of the sunlight in the wavelength range of 1.1 to 2.5 µm. Meanwhile, the design has good compatibility with the radiative cooling strategy. By applying selective-absorptive and radiative cooling strategies, the operating temperature of CSSC could be decreased about 23.2 K and 68.1 K under different meteorological conditions. Moreover, unlike the single radiative cooling strategy, the spectrum-selective mirror also has effective cooling effects in high wind speed meteorological conditions.

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Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Cao

et al. 2022

Advanced Optical Materials

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Figure 1. Outline of the current review of PDRC. The inner layer represents the essential factors that dictate the performance of the PDRC emitter, whereas the middle layer includes the representative types of materials for constructing the PDRC emitter, and the outer layer represents various realworld applications of the PDRC emitter. In the middle layer: multilayered inorganic materials (reproduced with permission. [13]

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Approach to fabricating high-performance cooler with near-ideal emissive spectrum for above-ambient air temperature radiative cooling

Cited by 25 publications

References 47 publications

A Pragmatic and High-Performance Radiative Cooling Coating with Near-Ideal Selective Emissive Spectrum for Passive Cooling

A Pragmatic and High-Performance Radiative Cooling Coating with Near-Ideal Selective Emissive Spectrum for Passive Cooling

The Design of Near-Perfect Spectrum-Selective Mirror Based on Photonic Structures for Passive Cooling of Silicon Solar Cells

Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

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