Progress in radiative transfer in porous medium: A review from macro scale to pore scale with experimental test

Wang, Fuqiang; Zhang, Xin-Ping; Dong, Yaoyao; Zhang, Yong; Shi, Xiaohong; Li, Yang; Cheng, Ziming

doi:10.1016/j.applthermaleng.2022.118331

Cited by 20 publications

(6 citation statements)

References 262 publications

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“…NIR shielding coating has received wide attention for its ease of preparation, low cost, and strong scalability. It is made by introducing dielectric particles into the polymer matrix to achieve multiple scattering of sunlight with different refractive indices to create an interface contrast with the dielectric. − The research on NIR shielding coating is mainly about TiO 2 particle coating and SiC/SiO 2 particle coating, which is aimed at investigating the impact of the particle volume fraction and coating thickness on the optical properties of color coatings. − …”

Section: Introductionmentioning

confidence: 99%

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Ma,

Zhang,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Smart windows with synergetic light modulation have heightened demands for applications in smart cars and novel buildings. However, improving the on-demand energy-saving efficiency is quite challenging due to the difficulty of modulating sunlight with a broad bandwidth in an energy-saving way. Herein, a smart window with switchable near-infrared light transmittance and passive radiative cooling is prepared via a monomer design strategy and photoinduced polymerization. The effects of hydrogen bonds and fluorine groups in acrylate monomers on the electro-optical properties as well as microstructures of polymer-dispersed liquid crystal films have been systematically studied. Some films show a high contrast ratio of 90.4 or a low threshold voltage (V th ) of 2.0 V, which can be roll-to-roll processed in a large area. Besides, the film has a superior indoor temperature regulation ability due to its passive radiative cooling and controllable near-infrared light transmittance properties. Its radiative cooling efficiency is calculated to be 142.69 W/m 2 and NIR transmittance could be switched to below 10%. The introduction of a carboxylic monomer and fluorinated monomer into the system endows the film with a highly efficient temperature management capability. The film has great potential for applications in fields such as flexible smart windows, camouflage materials, and so on.

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Section: Introductionmentioning

confidence: 99%

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Ma,

Zhang,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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“…18 Since then, considerable progress has been made and many studies have been performed using this technique. 12,19,20 Determining and understanding the radiative characteristics within packed beds of spherical porous media are required for the design and the safety evaluation of numerous energy systems and technologies. These radiative properties hold a pivotal significance across a spectrum of applications, exerting a profound influence on heat transfer efficiency, energy conservation, and overall system efficacy.…”

Section: Introductionmentioning

confidence: 99%

“…21 Researchers have traditionally regarded direct experiments as the most reliable means for the measure of the radiative properties of such a complex medium. 20,[22][23][24] Unfortunately, this method is expensive and extremely challenging. A number of researchers have addressed analytical solutions derived from extensive measurements and validations.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation for the determination of the radiative properties of spherical packed bed porous media: A COMSOL Multiphysics Study

Bouraoui,

Ben Nejma

2023

Advances in Mechanical Engineering

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The determination of the radiative properties of porous media has become a critical issue in various industrial and engineering applications. The aim of this paper is to characterize the radiative heat transfer process through porous media, assumed to be spherical packed beds. A prediction model was developed using the software COMSOL Multiphysics to simulate the interaction of each of the three proposed structures with a plane-heating surface. The distribution of normalized fluxes was assessed allowing the computation of effective radiative properties, namely the transmissivity, reflectivity, and absorptivity for diffusely and specularly reflecting particles. The results show that the arrangement of the particles has a noticeable influence on the media properties. Two layers of the third model were enough to obtain an opaque surface. Correlations have been developed to allow effective reflectivity, transmissivity, and absorptivity coefficients to be easily and accurately defined as a function of emissivity in future models. The suitability of the proposed models was discussed through a comparative study of the results found using numerical simulations with analytical calculations, with a good agreement obtained.

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“…The sun (∼5800 K) and outer space (∼3 K) can be effectively used for solar heating and sky radiative cooling. − When the spectral radiation properties of materials are regulated to have high solar absorptance and low mid-infrared thermal emittance, solar heating capability can be promoted. Conversely, achieving high solar reflectance and mid-infrared thermal emittance enables passive daytime radiative cooling. − However, relying solely on either a solar heating or radiative cooling mode − can result in overheating or overcooling due to the dynamic nature of the external environment. − …”

mentioning

confidence: 99%

A Facile and Effective Design for Dynamic Thermal Management Based on Synchronous Solar and Thermal Radiation Regulation

Guo,

Yu,

Shi

et al. 2024

Nano Lett.

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Passive solar heating and radiative cooling have attracted great interest in global energy consumption reduction due to their unique electricity-free advantage. However, static single radiation cooling or solar heating would lead to overcooling or overheating in cold and hot weather, respectively. To achieve a facile, effective approach for dynamic thermal management, a novel structured polyethylene (PE) film was engineered with a switchable cooling and heating mode obtained through a moisture transfer technique. The 100 μm PE film showed excellent solar modulation from 0.92 (dried state) to 0.32 (wetted state) and thermal modulation from 0.86 (dried state) to 0.05 (wetted state). Outdoor experiments demonstrated effective thermal regulation during both daytime and nighttime. Furthermore, our designed PE film can save 1.3− 41.0% of annual energy consumption across the whole country of China. This dual solar and thermal regulation mechanism is very promising for guiding scalable approaches to energy-saving temperature regulation.

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Progress in radiative transfer in porous medium: A review from macro scale to pore scale with experimental test

Cited by 20 publications

References 262 publications

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

A Smart Window with Passive Radiative Cooling and Switchable Near-Infrared Light Transmittance via Molecular Engineering

Numerical simulation for the determination of the radiative properties of spherical packed bed porous media: A COMSOL Multiphysics Study

A Facile and Effective Design for Dynamic Thermal Management Based on Synchronous Solar and Thermal Radiation Regulation

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