Article
Mathematics, Applied
K. Delendik, N. Kolyago, O. Voitik
Summary: This paper focuses on the development of a cooling system for high-power LED luminaires, utilizing mathematical optimization algorithms and numerical simulation to validate the effectiveness of a heat pipe-based system. The theoretical results were well validated by experimental data and numerical simulation, showing the potential for widespread application in the design of cooling systems for various LED products.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Green & Sustainable Science & Technology
Shuai Li, Zhihua Zhou, Junwei Liu, Ji Zhang, Huajie Tang, Zhuofen Zhang, Yanling Na, Chongxu Jiang
Summary: Radiative cooling (RC) is a passive cooling technology that can efficiently cool photovoltaic (PV) panels without consuming energy or producing pollution. This paper proposes an indirect cooling system for PV panels based on RC, which utilizes a cold storage module and water system to reduce the temperature and increase the power conversion efficiency (PCE) of the PV panels. Experimental results demonstrate that the system effectively decreases the average temperature of the PV panels and improves the PCE, and the inclusion of a cover shield and large water tank capacity further enhances the system efficiency.
Article
Nanoscience & Nanotechnology
Hannah Kim, Yiwei Gao, Ethan Moran, Annyn Howle, Sean Mcsherry, Spencer Cira, Andrej Lenert
Summary: We present a radiative cooling material that enhances reflectance and reduces ground temperature, showing promising potential for improving solar cell production and radiative cooling power.
Article
Chemistry, Multidisciplinary
Meijie Chen, Dan Pang, Jyotirmoy Mandal, Xingyu Chen, Hongjie Yan, Yurong He, Nanfang Yu, Yuan Yang
Summary: Passive daytime radiative cooling (PDRC) is gaining attention for its ability to cool without electricity. Porous polymers are attractive due to their excellent performance and scalability. This study explores how PDRC performance is affected by pore properties, such as size and porosity, through optical simulations. The results show that mixed nanopores have higher solar reflectance than single-sized pores, and under a semi-humid atmospheric condition, using an AI substrate can significantly increase thermal emittance and net cooling power. These findings provide guidance for designing high-performance porous coatings for PDRC applications.
Article
Thermodynamics
Song Lv, Bolong Zhang, Yishuang Ji, Juwen Ren, Jiahao Yang, Yin Lai, Zhihao Chang
Summary: To solve the problem of low power generation in currently developed RC-TEG devices, this paper demonstrated a promising C-RC-TEG device based on high radiation and thermal concentration. The experimental prototype utilized solar energy and radiative cooling to generate a temperature difference for driving TEG electricity generation. Results showed that solar irradiance and radiative cooling area had a positive effect on the C-RC-TEG model. Additionally, wind speed was found to decrease power generation. Concentrator in the light focusing area achieved a maximum power generation of 47 mW and a temperature difference of 7 K. This work provides guidance on effectively converting solar energy and radiative cooling into electricity.
Article
Materials Science, Multidisciplinary
D. Chae, S. Son, H. Lim, P. -H. Jung, J. Ha, H. Lee
Summary: Radiative cooling is a promising technology that utilizes the optical properties of aluminum oxide and silicon oxide particles, with low fabrication cost and high performance in cooling without the need for input energy or greenhouse gas emissions.
MATERIALS TODAY PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Wenrui Zhang, Yiding Wang, Hongling Sun, Chuntai Liu, Changyu Shen, Xianhu Liu
Summary: In this study, high-density polyethylene/boron nitride (HDPE/BN) composites with high thermal conductivity were prepared. These composites exhibit strong sunlight reflectivity (>86%) and emissivity (>93%) at the atmospheric window band (8-13 μm). They can achieve subambient cooling capacity of about 4-6 °C below ambient temperature in direct sunlight, making them suitable for electronic devices and building radiative cooling applications. Simulation using Energy Plus building energy software showed potential cooling energy savings of 5-11 MJ m(-2) per year, accounting for about 8-20% of the annual cooling energy consumption for these buildings.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Review
Engineering, Environmental
Junwei Liu, Yunfei Zhang, Shuai Li, Cristian Valenzuela, Shukuan Shi, Chongxu Jiang, Shiqiang Wu, Long Ye, Ling Wang, Zhihua Zhou
Summary: With the increasing concern over global warming and climate change, there is a growing demand for clean cooling technologies. Radiative sky cooling (RSC) has emerged as a promising solution that can dissipate heat without causing pollution or consuming energy. However, the low cooling power has hindered its large-scale application. This article provides a critical review of recent efforts to address this challenge and offers potential avenues for further advancements in RSC technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jie Huang, Mingzhang Li, Desong Fan
Summary: The newly developed core-shell particles radiative cooling coating shows efficient radiative cooling performance, easy preparation, low raw material cost, and wide applicability. It performs well in multiple application scenarios and has unique anti-fouling ability.
APPLIED MATERIALS TODAY
(2021)
Article
Thermodynamics
Mingke Hu, Bin Zhao, Suhendri, Jingyu Cao, Qiliang Wang, Saffa Riffat, Yuehong Su, Gang Pei
Summary: The low cooling power density hinders the wider promotion of radiative sky cooling (RSC) technology. The use of vacuum structures has been proposed to reduce non-radiative cooling loss and improve cooling capacity. However, there is a lack of comprehensive research on the effect of the vacuum mechanism on RSC performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Physics, Applied
Pingru Wu, Xingen Liu, Qifeng Liang, Zhun Liu
Summary: Research on the effect of graphene-coated substrates on regulating the commensurate epitaxial growth of ionic thin-films has shown significant impact. Recent studies have also explored the possibility of obtaining covalent-bonded stanene films through remote heteroepitaxy on monolayer graphene-covered Cu substrates. First-principles calculations were used to uncover the microscopic mechanisms behind these unusual remote interactions and the role of MLG in adatom growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Jinpeng Lv, Zhuo Chen, Xingji Li
Summary: Passive radiative cooling is significant for energy-saving and carbon neutrality. An all-season full-daytime subambient radiative cooler has been developed, which exhibits high solar reflectance and sky window emissivity. The experimental results show effective cooling performance in both summer and winter.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Composites
Shuang Tao, Feiqiang Guan, Fuhao Chen, Mingxue Chen, Zhenggang Fang, Chunhua Lu, Zhongzi Xu
Summary: A series of colorful super-omniphobic radiative cooling emitters with layered structures were constructed using a two-step process. These emitters can reflect over 90% of near infrared light, display over 85% infrared emission within atmospheric window, and have self-cleaning properties. Additionally, they maintained optical performance and super-omniphobicity even after abrasion and UV irradiation, providing efficient durable radiative cooling and aesthetic performance.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Yiteng Tu, Xinyu Tan, Guiguang Qi, Xiongbo Yang, Xiqiao Ouyang, Wensheng Yan, Weiwei Hu, Jialin Geng, Ronggui Yang
Summary: Daytime radiative cooling, a passive cooling technology, has attracted significant interest due to its zero energy consumption and zero greenhouse gas emissions. We propose a spectrally selective coating based on tri-cyclodecane dimethanol diacrylate (DCPDA) monomer, which can be fabricated with simple and scalable methods. The coated glass exhibits high transmissivity in the visible wavelengths and high thermal emissivity in the atmospheric window. Outdoor cooling tests demonstrate the sub-ambient cooling capability of the coating applied to aluminum sheets, making it a promising solution for transparent radiative cooling applications.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Johannes Halle, Nicolas Neel, Joerg Kroeger
Summary: The research reveals that graphene phonons can be excited by the local injection of electrons and holes from the tip of a scanning tunneling microscope. Both monolayer and bilayer graphene exhibit distinct phonon signatures in spectroscopy, with differences in phonon energies and the presence of a Dirac cone plasmon excitation in bilayer graphene.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
