Dynamic radiation regulations for thermal comfort

Zhai, Huatian; Fan, Desong; Li, Qiang

doi:10.1016/j.nanoen.2022.107435

Cited by 75 publications

(32 citation statements)

References 166 publications

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“…The skin temperature and the outer surface temperature of the fabric were recorded using thermocouple measurements and infrared thermography, respectively. The outer surface temperature of the G/P-C fabric cover (34.7 °C) was higher than that of the cotton fabric cover (33.1 °C) (Figure a), indicating that under the G/P-C fabric cover, the heat from the simulated skin radiated to the external environment through the IR absorption and transmission functions of the G/P-C fabric …”

Section: Resultsmentioning

confidence: 96%

“…The outer surface temperature of the G/P-C fabric cover (34.7 °C) was higher than that of the cotton fabric cover (33.1 °C) (Figure 4a), indicating that under the G/P-C fabric cover, the heat from the simulated skin radiated to the external environment through the IR absorption and transmission functions of the G/P-C fabric. 29 Figure 4b shows the skin temperature changes under cotton and G/P-C fabric covers. The temperature of the skin under the G/P-C fabric cover decreased rapidly in the initial 100 s and then remained nearly stable.…”

Section: Passive Cooling Capacity (No Solar Radiation)mentioning

confidence: 99%

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Fabric Comprised of Cotton Impregnated with Graphene Oxide and Coated with Polystyrene for Personal Moisture and Thermal Management

Yuan

Wang

Mei

et al. 2023

ACS Appl. Nano Mater.

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Moisture and thermal management fabrics that remove perspiration and regulate skin temperature can improve human comfort. However, fabrics with radiant cooling and rapid sw eat evaporation effects that can address both heat and moisture management remain a challenge. Therefore, a perspiration evaporation fabric based on graphene oxide (GO), polystyrene (PS), and cotton (referred to as G/P-C) was prepared using a simple soaking and electrostatic spinning strategy. When there was no perspiration (indoor scenarios), the fabric exhibited an exceptional radiative cooling capacity. The heat storage power of the G/P-C fabric (0.68 W/m2) was lower than that of cotton (4.63 W/m2) due to the integrated GO nanosheets that absorb human infrared radiation (IR), indicating that less heat was trapped between the skin and the fabric. Additionally, the temperature of human skin covered with the G/P-C fabric decreased by approximately 1.6 °C from that of skin covered with cotton. When there was perspiration (outdoor scenarios), the surface temperature of the resulting fabric increased by 3.2 °C and the evaporation rate was nearly twice that of cotton due to the combination of solar radiation adsorption and directional water transport. This fabric is expected to provide insight into the development of sweat management for personal health and comfort.

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Section: Resultsmentioning

confidence: 96%

Section: Passive Cooling Capacity (No Solar Radiation)mentioning

confidence: 99%

Fabric Comprised of Cotton Impregnated with Graphene Oxide and Coated with Polystyrene for Personal Moisture and Thermal Management

Yuan

Wang

Mei

et al. 2023

ACS Appl. Nano Mater.

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“…Among them, the micro-and nanopore structures exhibit remarkable optical properties derived from optimizable size and density for a wide range of applications in personal thermal comfort, energy-efficient green buildings, and wearable devices, 23,24 which can be found in the latest review papers. 25,26 In addition, the promising applications of color radiative cooling 27,28 and dynamic radiative cooling 29,30 have also received a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

“…Passive radiative cooling (PRC) can spontaneously cool terrestrial objects without external energy source under direct sunlight, offering an innovative path toward outdoor thermal management. , It simultaneously exhibits ultrahigh reflectance in the solar wavelengths (0.3–2.5 μm) and radiate excessive heat through an atmospheric transparency window (ATW, 8–13 μm) to outer cold space (4K) in the form of thermal radiation. , Effective PRC material designs such as micro/nanophotonic structures, − thin films, − coatings, − textiles, − and biomimetic materials − have been widely investigated and even realize subambient cooling performance. Among them, the micro- and nanopore structures exhibit remarkable optical properties derived from optimizable size and density for a wide range of applications in personal thermal comfort, energy-efficient green buildings, and wearable devices, , which can be found in the latest review papers. , In addition, the promising applications of color radiative cooling , and dynamic radiative cooling , have also received a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

Dual-Encapsulated Nanocomposite for Efficient Thermal Buffering in Heat-Generating Radiative Cooling

Zhai

Liu

Fan

et al. 2022

ACS Appl. Mater. Interfaces

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Radiative cooling has been considered an innovative passive method to resolve the problem of overheating of electronic devices. However, it is inefficient for cooling huge heat generation components. Herein, we report a dual-encapsulated nanocomposite (DEN) by integrating radiative cooling and phase-change materials (PCMs) for thermal buffering in heat-generating radiative cooling. The leak of PCMs is avoided by a simple dual-encapsulated structure with a three-dimensional (3D) interconnected cellular-like network structure and radiative cooling layer on the surface, 75% superior to the state-of-the-art single encapsulation designs. Additionally, our DEN not only shows outstanding optical properties with strong solar reflection (R̅ solar = 0.96) and IR-selective emission (ε̅8–13 μm = 0.94 and ηε = 1.15) but also exhibits high phase-change enthalpy (ΔH m = 192.2 J/g, ΔH c = 175.7 J/g), enabling remarkable radiative cooling capability and desirable thermal energy peak shaving and valley filling effect. Outdoor experiments demonstrate that DEN achieves a temperature drop up to 23 °C compared to the control group without DEN coverage when electronics generate heat. This dual-encapsulated nanocomposite provides a novel strategy and solution for outdoor passive thermal management.

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“…[15][16][17][18][19] Excessive building temperatures in hot weather can be decreased by reflecting the entire solar irradiation while radiating heat to frigid cosmic space. [19][20][21][22][23][24] In the past few years, extensive efforts have been made to promote daytime radiative cooling technology. Numerous materials and structures have been proposed to improve the cooling performance using multilayer films, [25,26] photonic crystals, [27] dielectric particle mixtures, [28][29][30][31][32] micro/nanoporous structures, [33][34][35] and biomimetic wrinkle structures.…”

mentioning

confidence: 99%

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

Zhang

Li²,

Wang

et al. 2022

Advanced Optical Materials

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As human civilization progressed and economic growth accelerated, researchers focused on creating comfortable living conditions to satisfy the growing requirements for cooling. [1][2][3][4] Active cooling apparatuses, such as air conditioners, have been broadly employed for the heat management of envelopments, such as buildings and vehicles. However, they deplete a considerable amount of energy. [5][6][7][8] Approximately 44% of the total energy expenditure in buildings can be attributed to heating, cooling, ventilation, and lighting systems in recently constructed buildings. [9] Air conditioners are responsible for the decrease in the driving range of electric vehicles of up to 53.7%. [10,11] It has become a long-term goal for advanced proactive temperature-managed envelopments to maintain an optimal interior air temperature with the least energy expenditure.Solar irradiation is a significant factor influencing energy depletion in the refrigeration systems of vehicles and buildings, accounting for almost 40%-70% of the entire cooling power burden in vehicles and buildings. [12,13] Generally, the solar irradiance power density under AM1.5 can reach 1000 W m −2 , with visible, infrared, and UV percentages of 50%, 43%, and 7%, respectively. [14] To eliminate the negative effects of solar radiation on the cooling energy load of buildings, zero-energy passive radiative cooling is a practical energy conservation tactic. [15][16][17][18][19] Excessive building temperatures in hot weather can be decreased by reflecting the entire solar irradiation while radiating heat to frigid cosmic space. [19][20][21][22][23][24] In the past few years, extensive efforts have been made to promote daytime radiative cooling technology. Numerous materials and structures have been proposed to improve the cooling performance using multilayer films, [25,26] photonic crystals, [27] dielectric particle mixtures, [28][29][30][31][32] micro/nanoporous structures, [33][34][35] and biomimetic wrinkle structures. [36,37] Nevertheless, most daytime radiative cooling technologies do not consider lighting and esthetic purposes and cannot be applied to objects such as the windows and glass curtain walls of buildings and vehicles. [38][39][40][41][42] Conventional windows (particularly skylights) in vehicles and buildings transmit almost 90% of the total incident solar radiation [43][44][45] 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 laye...

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Dynamic radiation regulations for thermal comfort

Cited by 75 publications

References 166 publications

Fabric Comprised of Cotton Impregnated with Graphene Oxide and Coated with Polystyrene for Personal Moisture and Thermal Management

Fabric Comprised of Cotton Impregnated with Graphene Oxide and Coated with Polystyrene for Personal Moisture and Thermal Management

Dual-Encapsulated Nanocomposite for Efficient Thermal Buffering in Heat-Generating Radiative Cooling

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

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