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Enhancement of passive daytime radiative cooling performance with a novel hybrid strategy of integrating double-layer nanoparticle-based coating and ballistic thermal rectifier

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Abstract

To date, various designs have been proposed to increase the efficiency of radiative coolers with approaches such as changes in materials and their properties, size and shape of the elements, and structures geometry. In the present work, an attempt has been made to obtain this important issue by presenting an innovative strategy from a new perspective. In this strategy, by keeping the face exposed to solar energy away from the body, heat distribution can be inhibited, which leads to a decrease in body temperature. This act simultaneously provides a higher operating temperature for the emitter section, thereby enhancing the exergy of the system. On the other hand, the presence of the thermal diode allows the surface of the object to continue to radiate its heat. Hence, several experiments were designed and performed to evaluate the performance of the strategy by an experimental apparatus built for this purpose. Initially, the rectification ratio results of constructed rectifier mirrors showed that the light transmission amount in the forward path is nearly 44% higher than in the reverse direction. In the next step, the temperature measurement of the samples showed the sub-ambient temperature for the present work with a difference of 9 and 2 °C, against direct sunlight and the night sky, respectively. This model also has a high-temperature difference of about 13, 11, and 6.5 °C during the day and 1.6, 0.5, and 0.5 °C at night below the other three samples. This superiority was maintained in cloudy weather conditions as well as thermal shock stability. One of the most important applications of radiation coolers is in the aerospace industry. In this particular application, in addition to cooling, it is vital to protect the equipment against thermal shock caused by sudden and extreme temperature differences in space. Due to obtaining results such as efficient cooling rate, and high resistance to thermal shock, this concept provides a practical vision for improving the spacecraft's cooling systems.

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Abbreviations

PE:

Polyethylene

PS:

Polystyrene

PU:

Polyurethane

λ:

Wavelength (m)

θ:

Angle (Degree °)

ε (λ, θ):

Spectral and angular emissivity

τ(λ):

Spectral transmissivity

RSC:

Radiative sky cooling

ThD:

Thermal diode

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Acknowledgements

The authors wish to thank the reviewers for their careful, unbiased, and constructive suggestions, which led to this revised manuscript.

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Authors and Affiliations

  1. Mechanical Engineering Department, Central Tehran Branch, Islamic Azad University, Tehran, Iran

    Mehdi Alimohammadian & Saeed Dinarvand

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  1. Mehdi Alimohammadian
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  2. Saeed Dinarvand
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Correspondence to Saeed Dinarvand.

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Alimohammadian, M., Dinarvand, S. Enhancement of passive daytime radiative cooling performance with a novel hybrid strategy of integrating double-layer nanoparticle-based coating and ballistic thermal rectifier. J Therm Anal Calorim 148, 7995–8007 (2023). https://doi.org/10.1007/s10973-023-12275-1

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  • DOI: https://doi.org/10.1007/s10973-023-12275-1

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