1
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Pal SK, Otoufat T, Koh D, Bae H, Lee S, Lee H, Kim G. Solar-Adaptive Cooling Blocks Composed of Recycled Fabric. ACS APPLIED MATERIALS & INTERFACES 2024; 16:58730-58738. [PMID: 39405426 DOI: 10.1021/acsami.4c14431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2024]
Abstract
Radiative cooling technologies have had a significant impact on advancing carbon neutrality efforts by significantly improving the passive cooling efficiency. The tandem of conduction and radiation enables solar-adaptive radiative cooling through the insulating effect of materials along with solar absorption, which affects the thermal state of materials and enhances radiative thermal transfer from the surface under solar irradiation. This enhancement is achieved by utilizing the porous polymeric structure of materials, which facilitates improved conduction pathways along with solar reflectance, while maintaining the effective emission of thermal radiation. In this particular scenario, blocks, which were made of recycled fibers, offer a great opportunity as solar-adaptive cooling materials, enabling their easy deployment for cooling applications. Herein, we have fabricated a porous block using fiber wastes that combines strong solar reflectance (92%) at the 1 μm region and high thermal infrared emittance (∼75%) at the 10 μm region. The combination of effective solar reflection and thermal infrared emission allows the fiber block to achieve a high cooling performance of approximately 68 W/m2 under solar irradiation. In addition, the fiber block works effectively for insulation during the night, thereby enhancing its heat retention capabilities. The economic and environmental advantages of the fiber block make it a cost-competitive and sustainable choice for near-market cooling technologies. This design is anticipated to expand the practical application range of passive cooling.
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Affiliation(s)
- Sudip Kumar Pal
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon 38822, Republic of Korea
| | - Tohid Otoufat
- Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
| | - Dongwan Koh
- Department of Organic Materials and Textile Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk 54896, Republic of Korea
| | - Hoyeon Bae
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon 38822, Republic of Korea
| | - Sungkwon Lee
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon 38822, Republic of Korea
| | - Hoik Lee
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan-si 15588, Republic of Korea
| | - Gunwoo Kim
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon 38822, Republic of Korea
- Department of Organic Materials and Textile Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk 54896, Republic of Korea
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2
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Lin C, Li K, Li M, Dopphoopha B, Zheng J, Wang J, Du S, Li Y, Huang B. Pushing Radiative Cooling Technology to Real Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2409738. [PMID: 39415410 DOI: 10.1002/adma.202409738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2024] [Revised: 09/08/2024] [Indexed: 10/18/2024]
Abstract
Radiative cooling is achieved by controlling surface optical behavior toward solar and thermal radiation, offering promising solutions for mitigating global warming, promoting energy saving, and enhancing environmental protection. Despite significant efforts to develop optical surfaces in various forms, five primary challenges remain for practical applications: enhancing optical efficiency, maintaining appearance, managing overcooling, improving durability, and enabling scalable manufacturing. However, a comprehensive review bridging these gaps is currently lacking. This work begins by introducing the optical fundamentals of radiative cooling and its potential applications. It then explores the challenges and discusses advanced solutions through structural design, material selection, and fabrication processes. It aims to provide guidance for future research and industrial development of radiative cooling technology.
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Affiliation(s)
- Chongjia Lin
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Keqiao Li
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Meng Li
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Benjamin Dopphoopha
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Jiongzhi Zheng
- Thayer School of Engineering, Dartmouth College, 14 Engineering Dr, Hanover, NH, 03755, USA
| | - Jiazheng Wang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shanshan Du
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yang Li
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Baoling Huang
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Futian, Shenzhen, 518000, China
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology, Guangzhou, 511400, China
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3
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Huang K, Du Y, Wang W, Liu J, Tang H, Wang C, Yang X, Yao G, Lin Z, Zhou Z. Stretchable and Self-Cleaning Daytime Radiative Coolers for Human Fabric and Building Applications. ACS APPLIED MATERIALS & INTERFACES 2024; 16:48235-48245. [PMID: 39194175 DOI: 10.1021/acsami.4c08652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Advancements in radiative cooling technology have shown significant progress in recent years. However, the limited mechanical properties of most radiative coolers greatly hinder their practical applications, particularly in the context of human cooling fabrics. In this study, we present the fabrication of facile and stretchable radiative coolers with exceptional cooling performance by utilizing the design of porous radiative coolers as guidelines for developing promising elastomer coolers. Subsequently, we employ a simple electrospinning method to fabricate these coolers, resulting in impressive solar reflectivity (∼96.1%) and infrared emissivity (over 95%). During the summer, these coolers demonstrate a maximum temperature drop of ∼9.6 °C. Additionally, the developed coolers exhibit superior hydrophobicity and mechanical properties, with a high strain capacity exceeding 700% and a stress tolerance of over 30 MPa, highlighting their potential for application in automobile textiles and cooling fabrics. Furthermore, we evaluate the radiative cooling performance of stretchable coolers using global-scale modeling, revealing their significant cooling potential across various regions worldwide.
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Affiliation(s)
- Ke Huang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yahui Du
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Wufan Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Junwei Liu
- Department of Building Environment and Energy Engineering, International Centre of Urban Energy Nexus, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China
| | - Huajie Tang
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Cheng Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Xueqing Yang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Gang Yao
- School of Architecture, Tianjin Chengjian University, Tianjin 300000, China
| | - Zhenjia Lin
- Department of Building Environment and Energy Engineering, International Centre of Urban Energy Nexus, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China
| | - Zhihua Zhou
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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4
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Chen Q, Huang X, Lu Y, Xu H, Zhao D. Mechanically Tunable Transmittance Convection Shield for Dynamic Radiative Cooling. ACS APPLIED MATERIALS & INTERFACES 2024; 16:21807-21817. [PMID: 38634635 DOI: 10.1021/acsami.4c00825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
Radiative cooling is the process to dissipate heat to the outer space through an atmospheric window (8-13 μm), which has great potential for energy savings in buildings. However, the traditional "static" spectral characteristics of radiative cooling materials may result in overcooling during the cold season or at night, necessitating the development of dynamic spectral radiative cooling for enhanced energy saving potential. In this study, we showcase the realization of dynamic radiative cooling by modulating the heat transfer process using a tunable transmittance convection shield (TTCS). The transmittance of the TTCS in both solar spectrum and atmospheric window can be dynamically adjusted within ranges of 28.8-72.9 and 27.0-80.5%, with modulation capabilities of ΔTsolar = 44.1% and ΔT8-13 μm = 53.5%, respectively. Field measurements demonstrate that through the modulation, the steady-state temperature of the TTCS architecture is 0.3 °C lower than that of a traditional radiative cooling architecture during the daytime and 3.3 °C higher at nighttime, indicating that the modulation strategy can effectively address the overcooling issue, offering an efficient way of energy saving through dynamic radiative cooling.
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Affiliation(s)
- Qixiang Chen
- School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China
| | - Xuemei Huang
- Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China
| | - Yuehui Lu
- School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Hua Xu
- School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang 315211, China
| | - Dongliang Zhao
- School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China
- Institute of Science and Technology for Carbon Neutrality, Southeast University, Nanjing, Jiangsu 210096, China
- Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing, Jiangsu 210096, China
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5
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Cai C, Chen Y, Ding C, Wei Z, Wang X. Eliminating trade-offs between optical scattering and mechanical durability in aerogels as outdoor passive cooling metamaterials. MATERIALS HORIZONS 2024; 11:1502-1514. [PMID: 38230558 DOI: 10.1039/d3mh01802d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Passive cooling is a promising approach for reducing the large energy consumption to achieve carbon neutrality. Foams/aerogels can be considered effective daytime cooling materials due to their good solar scattering and thermal insulation capacity. However, the contradiction between the desired high solar reflectivity and mechanical performance still limits their scalable production and real application. Herein, inspired by the "Floor-Pillar" concept in the building industry, a multi-structure assembly-induced ice templating technology was used to construct all-cellulosic aerogels with well-defined biomimetic structures. By using cellulose nanofibers (CNFs) as pillars and cellulose nanocrystals (CNCs) as floors and methyltrimethoxysilane (MTMS) as a crosslinking material, an all-cellulosic aerogel (NCA) exhibiting high mechanical strength (mechanical strength = 0.3 MPa at 80% compression ratio, Young's modulus = 1 MPa), ultralow thermal conductivity (28 mW m-1 K-1), ultrahigh solar reflectance (97.5%), high infrared emissivity (0.93), as well as excellent anti-weather function can be achieved, exceeding the performance of most reported cellulosic aerogels. Furthermore, the mechanisms of the improved mechanical strength and stimulated superior solar reflectance of NCA were studied in detail using finite element simulations and COMSOL Multiphysics. As a result, the NCA can achieve a cooling efficiency of 7.5 °C during the daytime. The building energy stimulus demonstrated that 44% of cooling energy can be saved in China annually if the NCA is applied. This work lays the foundation for the preparation of biomass aerogels for energy-saving applications.
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Affiliation(s)
- Chenyang Cai
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.
| | - Yi Chen
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.
| | - Chunxiang Ding
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.
| | - Zechang Wei
- College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China
| | - Xuan Wang
- Department of Mechanical Engineering, University of North Texas, Denton, Texas, 76203, USA.
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6
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Kim H, Gao Y, Moran E, Howle A, McSherry S, Cira S, Lenert A. High albedo daytime radiative cooling for enhanced bifacial PV performance. NANOPHOTONICS (BERLIN, GERMANY) 2024; 13:621-627. [PMID: 39635097 PMCID: PMC11501292 DOI: 10.1515/nanoph-2023-0611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 11/29/2023] [Indexed: 12/07/2024]
Abstract
We present a radiative cooling material capable of enhancing albedo while reducing ground surface temperatures beneath fielded bifacial solar panels. Electrospinning a layer of polyacrylonitrile nanofibers, or nanoPAN, onto a polymer-coated silver mirror yields a total solar reflectance of 99 %, an albedo of 0.96, and a thermal emittance of 0.80. The combination of high albedo and high emittance is enabled by wavelength-selective scattering induced by the hierarchical morphology of nanoPAN, which includes both thin fibers and bead-like structures. During outdoor testing, the material outperforms the radiative cooling power of a state-of-the-art control by ∼20 W/m2 and boosts the photocurrent produced by a commercial silicon cell by up to 6.4 mA/cm2 compared to sand. These experiments validate essential characteristics of a high-albedo radiative-cooling reflector with promising potential applications in thermal and light management of fielded bifacial panels.
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Affiliation(s)
- Hannah Kim
- University of Michigan, Ann Arbor, MI, USA
| | - Yiwei Gao
- University of Michigan, Ann Arbor, MI, USA
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7
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Yang M, Zeng Y, Du Q, Sun H, Yin Y, Yan X, Jiang M, Pan C, Sun D, Wang Z. Enhanced radiative cooling with Janus optical properties for low-temperature space cooling. NANOPHOTONICS (BERLIN, GERMANY) 2024; 13:629-637. [PMID: 39635101 PMCID: PMC11501828 DOI: 10.1515/nanoph-2023-0641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 12/17/2023] [Indexed: 12/07/2024]
Abstract
Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (J-MRC) with Janus optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the J-MRC functions as a conventional radiative cooling material to supply sub-ambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the J-MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.
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Affiliation(s)
- Meng Yang
- City University of Hong Kong, Hong Kong SAR, China
- Southern University of Science and Technology, Shenzhen, China
| | - Yijun Zeng
- City University of Hong Kong, Hong Kong SAR, China
- The Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Qingyuan Du
- Southern University of Science and Technology, Shenzhen, China
| | - Haoyang Sun
- Southern University of Science and Technology, Shenzhen, China
| | - Yingying Yin
- City University of Hong Kong, Hong Kong SAR, China
| | - Xiantong Yan
- City University of Hong Kong, Hong Kong SAR, China
| | - Mengnan Jiang
- The Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Chin Pan
- City University of Hong Kong, Hong Kong SAR, China
| | - Dazhi Sun
- Southern University of Science and Technology, Shenzhen, China
| | - Zuankai Wang
- The Hong Kong Polytechnic University, Hong Kong SAR, China
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8
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Jeon SK, Kim JT, Kim MS, Kim IS, Park SJ, Jeong H, Lee GJ, Kim YJ. Scalable, Patternable Glass-Infiltrated Ceramic Radiative Coolers for Energy-Saving Architectural Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2302701. [PMID: 37485641 PMCID: PMC10520670 DOI: 10.1002/advs.202302701] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/20/2023] [Indexed: 07/25/2023]
Abstract
A huge concern on global climate/energy crises has triggered intense development of radiative coolers (RCs), which are promising green-cooling technologies. The continuous efforts on RCs have fast-tracked notable energy-savings by minimizing solar absorption and maximizing thermal emission. Recently, in addition to spectral optimization, ceramic-based thermally insulative RCs are reported to improve thermoregulation by suppressing heat gain from the surroundings. However, a high temperature co-firing process of ceramic-based thick film inevitably results in a large mismatch of structural parameters between designed and fabricated components, thereby breaking spectral optimization. Here, this article proposes a scalable, non-shrinkable, patternable, and thermally insulative ceramic RC (SNPT-RC) using a roll-to-roll process, which can fill a vital niche in the field of radiative cooling. A stand-alone SNPT-RC exhibits excellent thermal insulation (≈0.251 W m-1 K-1 ) with flame-resistivity and high solar reflectance/long-wave emissivity (≈96% and 92%, respectively). Alternate stacks of intermediate porous alumina/borosilicate (Al2 O3 -BS) layers not only result in outstanding thermal and spectral characteristics, causing excellent sub-ambient cooling (i.e., 7.05 °C cooling), but also non-shrinkable feature. Moreover, a perforated SNPT-RC demonstrates its versatility as a breathable radiative cooling shade and as a semi-transparent window, making it a highly promising technology for practical deployment in energy-saving architecture.
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Affiliation(s)
- Seung Kyu Jeon
- Ceramic Total Solution CenterKorea Institute of Ceramic Engineering and Technology3321, Gyeongchung‐daero, Sindun‐myeon, Icheon‐si, Gyeonggi‐doIcheon17303Republic of Korea
| | - June Tae Kim
- Department of Electronics EngineeringPusan National University2, Busandaehak‐ro 63 beon‐gilBusan46241Republic of Korea
| | - Min Seong Kim
- Department of Electronics EngineeringPusan National University2, Busandaehak‐ro 63 beon‐gilBusan46241Republic of Korea
| | - In Soo Kim
- Nanophotonics Research CenterKorea Institute of Science and Technology5. Hwarang‐ro 14‐gil, Seongbuk‐guSeoul02792Republic of Korea
- KIST‐SKKU Carbon‐Neutral Research CenterSungkyunkwan University (SKKU)Suwon16419Republic of Korea
- School of Advanced Materials Science and EngineeringSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Sung Jin Park
- Ceramic Total Solution CenterKorea Institute of Ceramic Engineering and Technology3321, Gyeongchung‐daero, Sindun‐myeon, Icheon‐si, Gyeonggi‐doIcheon17303Republic of Korea
| | - Hyeondeok Jeong
- Carbon Composite Materials Research CenterKorea Institute of Science and Technology92 Chudong‐ro, Bongdong‐eupWanju‐gunJeonbuk55324Republic of Korea
| | - Gil Ju Lee
- Department of Electronics EngineeringPusan National University2, Busandaehak‐ro 63 beon‐gilBusan46241Republic of Korea
| | - Yeong Jae Kim
- Ceramic Total Solution CenterKorea Institute of Ceramic Engineering and Technology3321, Gyeongchung‐daero, Sindun‐myeon, Icheon‐si, Gyeonggi‐doIcheon17303Republic of Korea
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9
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Gao W, Chen Y. Emerging Materials and Strategies for Passive Daytime Radiative Cooling. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206145. [PMID: 36604963 DOI: 10.1002/smll.202206145] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 12/04/2022] [Indexed: 05/04/2023]
Abstract
In recent decades, the growing demands for energy saving and accompanying heat mitigation concerns, together with the vital goal for carbon neutrality, have drawn human attention to the zero-energy-consumption cooling technique. Recent breakthroughs in passive daytime radiative cooling (PDRC) might be a potent approach to combat the energy crisis and environmental challenges by directly dissipating ambient heat from the Earth to the cold outer space instead of only moving the heat across the Earth's surface. Despite significant progress in cooling mechanisms, materials design, and application exploration, PDRC faces potential functionalization, durability, and commercialization challenges. Herein, emerging materials and rational strategies for PDRC devices are reviewed. First, the fundamental physics and thermodynamic concepts of PDRC are examined, followed by a discussion on several categories of PDRC devices developed to date according to their implementation mechanism and material properties. Emerging strategies for performance enhancement and specific functions of PDRC are discussed in detail. Potential applications and possible directions for designing next-generation high-efficiency PDRC are also discussed. It is hoped that this review will contribute to exciting advances in PDRC and aid its potential applications in various fields.
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Affiliation(s)
- Wei Gao
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Yongping Chen
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
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10
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Tang H, Guo C, Xu Q, Zhao D. Boosting Evaporative Cooling Performance with Microporous Aerogel. MICROMACHINES 2023; 14:219. [PMID: 36677280 PMCID: PMC9862351 DOI: 10.3390/mi14010219] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/17/2023]
Abstract
Hydrogel-based evaporative cooling with a low carbon footprint is regarded as a promising technology for thermal regulation. Yet, the efficiency of hydrogel regeneration at night generally mismatches with vapor evaporation during the day, resulting in a limited cooling time span, especially in arid regions. In this work, we propose an efficient approach to improve hydrogel cooling performance, especially the cooling time span, with a bilayer structure, which comprises a bottom hydrogel layer and an upper aerogel layer. The microporous aerogel layer can reduce the saturation vapor density at the hydrogel surface by employing daytime radiative cooling, together with increased convective heat transfer resistance by thermal insulation, thus boosting the duration of evaporative cooling. Specifically, the microstructure of porous aerogel for efficient radiative cooling and vapor transfer is synergistically optimized with a cooling performance model. Results reveal that the proposed structure with a 2-mm-thick SiO2 aerogel can reduce the temperature by 1.4 °C, meanwhile extending the evaporative cooling time span by 11 times compared to a single hydrogel layer.
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Affiliation(s)
- Huajie Tang
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Chenyue Guo
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Qihao Xu
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Dongliang Zhao
- School of Energy and Environment, Southeast University, Nanjing 210096, China
- Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing 210096, China
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11
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Zhang X, Yang W, Shao Z, Li Y, Su Y, Zhang Q, Hou C, Wang H. A Moisture-Wicking Passive Radiative Cooling Hierarchical Metafabric. ACS NANO 2022; 16:2188-2197. [PMID: 35075910 DOI: 10.1021/acsnano.1c08227] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Developing functional textiles with a cooling effect is important for personal comfort in human life and activities. Although existing passive cooling fabrics exhibit promising cooling effects, they do not meet the thermal comfort requirements under many practical conditions. Here, we report a nanofiber membrane-based moisture-wicking passive cooling hierarchical metafabric that couples selective optical cooling and wick-evaporation cooling to achieve efficient temperature and moisture management. The hierarchical metafabric showed high sunlight reflectivity (99.16% in the 0.3-0.76 μm wavelength range and 88.60% in the 0.76-2.5 μm wavelength range), selective infrared emissivity (78.13% in the 8-13 μm wavelength range), and good moisture permeability owing to the optical properties of the material and hierarchical morphology design. Cooling performance experiments revealed that covering simulated skin with the hierarchical metafabric prevented overheating by 16.6 °C compared with traditional textiles, including a contribution from management of the humidity (∼8.2 °C). In addition to the personal thermal management ability, the hierarchical metafabric also showed good wearability.
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Affiliation(s)
- Xiaoshuang Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
| | - Weifeng Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
| | - Zhuwang Shao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
| | - Yaogang Li
- Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai 201620, P.R. China
| | - Yun Su
- College of Fashion and Design, Donghua University, Shanghai 200051, P.R. China
| | - Qinghong Zhang
- Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai 201620, P.R. China
| | - Chengyi Hou
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
| | - Hongzhi Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
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12
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Tang K, Dong K, Li J, Gordon MP, Reichertz FG, Kim H, Rho Y, Wang Q, Lin CY, Grigoropoulos CP, Javey A, Urban JJ, Yao J, Levinson R, Wu J. Temperature-adaptive radiative coating for all-season household thermal regulation. Science 2021; 374:1504-1509. [PMID: 34914515 DOI: 10.1126/science.abf7136] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Kechao Tang
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Key Laboratory of Microelectronic Devices and Circuits (MOE), School of Integrated Circuits, Peking University, Beijing 100871, P. R. China
| | - Kaichen Dong
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jiachen Li
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Applied Science and Technology Graduate Group, University of California, Berkeley, CA, 94720, USA
| | - Madeleine P Gordon
- Applied Science and Technology Graduate Group, University of California, Berkeley, CA, 94720, USA.,The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | | | - Hyungjin Kim
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
| | - Yoonsoo Rho
- Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA
| | - Qingjun Wang
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Chang-Yu Lin
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
| | | | - Ali Javey
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
| | - Jeffrey J Urban
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jie Yao
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Ronnen Levinson
- Heat Island Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Junqiao Wu
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.,Applied Science and Technology Graduate Group, University of California, Berkeley, CA, 94720, USA
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