Common glass without spectral regulation effect cannot offer an energy‐saving function, and radiative cooling technology without visible transparency cannot satisfy the illumination and esthetic demands. Herein, the concept of utilizing a biomimetic beetle cuticle structure, guided by principles of Chinese Taoist philosophy, is proposed to accomplish efficient radiative regulation. Subsequently, low‐cost biomimetic radiative cooling (Bio‐RC) glass is presented, which can reduce the temperature of buildings throughout daytime by blocking near‐infrared (NIR) radiation, conveying visible light, and emitting heat within the atmospheric window. Utilizing only three layers of thin films, Bio‐RC glass achieves multi‐band spectral regulation, avoids a complicated preparation process, and has the potential for large‐scale production. Spectrometry reveals that Bio‐RC glass exhibits an effective visible light transmissivity of 80.5%, a mean NIR transmissivity of 10.3%, and an effective emissivity of 94.8% within the atmospheric window. A one‐month rooftop test demonstrates that Bio‐RC glass achieves a maximum cavity temperature reduction of 18.1 °C compared with common glass. Energy consumption analysis indicates that Bio‐RC glass can conserve approximately 23.4% of the total energy consumption per year compared with common glass. The proposed Bio‐RC glass can lower the temperature during daylight while preserving transparency and esthetics, making it suitable for application in buildings and vehicles.

Low‐Cost and Large‐Scale Producible Biomimetic Radiative Cooling Glass with Multiband Radiative Regulation Performance

Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

Synergistic effect of Cu/Ni cocatalysts on CdS for sun-light driven hydrogen generation from water splitting

Passive daytime radiative cooling (PDRC) is an emerging cooling technique of a sunshine-exposed terrestrial surface by dissipating excessive heat into the deep-cold outer space. It is a passive technique without fuel consumption and paves a promising way to overcome the issues of energy shortage and environmental pollution at the global scale. In the contemporary era, highly developed nanophotonic engineering allows spectrally precise emissivity/reflectivity of a thermal surface, significantly improving a PDRC structure's cooling power. Furthermore, scalable manufacturing techniques have also been successfully developed for PDRC material preparation at affordable costs, promoting their practical implementations. However, a comprehensive review of PDRC materials for real-world applications is still lacking. This work begins with the fundamentals of PDRC, continues with the power enhancement and scaling up process of PDRC materials, boosts with the advances of three typical types of scalable PDRC materials, including films, textiles, and bulk materials, and ends with an outlook that addresses the limitations and challenges on PDRC materials for extensive real-world applications. This review can help scientists and engineers carry forward the design and implementation of PDRC materials, promote the mitigation of global issues such as scorching and water shortage, and make the planet healthier and more comfortable. 

Passive daytime radiative cooling materials toward real-world applications

Passive radiative cooling (PRC) is a promising carbon reduction technology that radiates heat into the universe through atmospheric transparency window (ATW) to cool objects below ambient temperature with zero energy consumption. However, so far the cooling efficiencies of most PRC designs are inevitably restrained by inadequate optical properties and parasitic heat gains from ambient air. These defects are overcome by developing aerogel coolers with functional integration of low absorption of solar irradiance, strong mid-infrared emittance, and high thermal insulation in one design. In particular, cross-linked silica-hybridized cellulose acetate is exploited to construct robust aerogels with well-arranged nano/micro porous structures, representing a solar reflectance up to ∼96 % and an ATW emissivity of ∼97 %. Such aerogels can realize a subambient temperature drop of ∼9.15 °C during the daytime and maintain their remarkable cooling performance even in cloudy, moist, and windy climates. The aerogel coolers also show excellent anti-aging, self-cleaning, and compression resistance, making them adaptable for long-term cooling applications. The year-round energy consumption simulations demonstrate that an average total energy saving of 13.87 kW m−2 per year can be promisingly achieved in China when the aerogel coolers are integrated on building roofs. This work paves a new way to manufacture more cost-effective and sustainable cooling materials for efficient building energy conservation in the future. 

Construction of robust silica-hybridized cellulose aerogels integrating passive radiative cooling and thermal insulation for year-round building energy saving

Passive all-day freshwater harvesting through a transparent radiative cooling film

Effect of information and communication technology and electricity consumption on green total factor productivity

Non-noble metal copper phosphide deposited on the surface of cadmium sulfide nanorods can effectively enhance the photocatalytic hydrogen evolution performance

With the efficient use of energy, the study of emissivity is considered to be of great importance. In industrial production, temperature measurement technology, and many other fields, emissivity research is performed an important role. The emissivity is considered to be an important quantitative parameter for the infrared radiation characteristics of high-temperature coatings. Although the experimental measurement technique for high-temperature infrared spectral emissivity by the integrated blackbody method has been studied, little research has been reported on the integrated blackbody temperature field measurement and the simulation study of the emissivity of the integrated blackbody cavity. Therefore, in this paper, the temperature distribution of integrated blackbody cavity with the graphite cavity bottom is measured at 800°C, 1000°C. Besides, the above results are adopted, and the effective emissivity of the integrated blackbody is numerically simulated, based on the measurement results and the Monte-Carlo ray-tracing method. Thus, the feasibility of integrating the blackbody is demonstrated, the infrared radiation properties of integrated blackbodies are also studied as influenced by the temperature of the blackbody cavity.

Research of temperature distribution and radiation characteristics of integrated blackbody on high-temperature

Power batteries are a crucial component of electric vehicles and other electric equipment. Their long-term high-rate discharge generates a lot of heat, which can lead to battery failure, shortened battery life, and even safety accidents if not managed properly. Due to its high thermal conductivity, the heat pipe can quickly conduct heat away from the battery and separate the heat source from the heat sink. In addition, due to its excellent isothermal performance, the heat pipe can also achieve the characteristics of low-temperature preheating and high-temperature cooling of the power battery by reducing the inhomogeneity of the battery temperature field to reduce the temperature difference. In this paper, we review the current state of the art in thermal management of automotive lithium-ion battery, and highlight the current state of thermal management of batteries based on the combination of nanofluids and heat pipes. Finally, the development of nanofluidic heat pipes in lithium-ion battery heat management systems is prospected.

Research Progress of Nanofluid Heat Pipes in Automotive Lithium-ion Battery Heat Management Technology

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