Potential building energy savings by passive strategies combining daytime radiative coolers and thermochromic smart windows

Lin, Kaixin; Chao, Luke; Lee, Hau Him; Ren, Xiaomin; Liu, Sai; Ho, Tsz Chung; Huang, Baoling; Yu, K. M.; Tso, Chi Yan

doi:10.1016/j.csite.2021.101517

Cited by 30 publications

(13 citation statements)

References 44 publications

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“…(g) Reflectance and emissivity spectra of PDMA-DPRC, where the orange shaded area represents the solar irradiation profile AM1.5, and the blue shaded area represents the atmospheric transmittance. Reproduced with permission from ref . Copyright 2021 Elsevier.…”

Section: Emerging Directionsmentioning

confidence: 99%

“…Lin et al. developed a passive strategy involving a PDMS–Si-Ag daytime passive radiative cooler (DPRC) and PNIPAm hydrogel thermochromic smart window (HTSW) . As shown in Figure g, PDMS-DPRC shows a high reflectivity of 94.7% over almost the whole solar wavelength.…”

Section: Emerging Directionsmentioning

confidence: 99%

“…Lin et al developed a passive strategy involving a PDMS−Si-Ag daytime passive radiative cooler (DPRC) and PNIPAm hydrogel thermochromic smart window (HTSW). 374 As shown in Figure 34g, PDMS-DPRC shows a high reflectivity of 94.7% over almost the whole solar wavelength. For houses equipped with both PDMS-DPRC and HTSW, the indoor air temperature decreased by 4.8 °C in the 48 h of the field test.…”

Section: Mechanothermochromic Windowsmentioning

confidence: 99%

See 2 more Smart Citations

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

Zhang

Zhou

et al. 2023

Chem. Rev.

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Thermochromic energy efficient windows represent an important protocol technology for advanced architectural windows with energy-saving capabilities through the intelligent regulation of indoor solar irradiation and the modulation of window optical properties in response to real-time temperature stimuli. In this review, recent progress in some promising thermochromic systems is summarized from the aspects of structures, the micro-/mesoscale regulation of thermochromic properties, and integration with other emerging energy techniques. Furthermore, the challenges and opportunities in thermochromic energy-efficient windows are outlined to promote future scientific investigations and practical applications in building energy conservation.

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Section: Emerging Directionsmentioning

confidence: 99%

Section: Emerging Directionsmentioning

confidence: 99%

Section: Mechanothermochromic Windowsmentioning

confidence: 99%

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Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

Zhang

Zhou

et al. 2023

Chem. Rev.

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“…Figure 8h shows the four outdoor experimental models for window applications. 135 In a typical window application, a TC sensor is embedded in the model house where it can be protected. Although Wang used a similar experimental system, their smart and RC window surfaces were oriented normally toward the zenith.…”

Section: Acsmentioning

confidence: 99%

Functional Radiative Cooling: Basic Concepts, Materials, and Best Practices in Measurements

Liu,

Bae,

Noh

et al. 2023

ACS Appl. Electron. Mater.

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“…For the residential housing energy portion, about 51% is consumed for heating and cooling to maintain a desirable indoor temperature. [1][2][3] The energy-saving connotation refers to taking technically feasible, economically rational, environmentally, and effective measures to all energy-saving technologies for improving the use efficiency of energy resources with innovative ideas. To make the process less dependent on human intervention and more efficient, smart windows (SWs) which change properties to block out light or heat have been concerned and used for decades.…”

Section: Introductionmentioning

confidence: 99%

Combining Krafft Point and Volume Phase Transition Temperature Toward Regulation of Solar Radiation and Privacy Protection

Liu

Yan

et al. 2022

Adv Materials Inter

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temperature, electricity, and optics have been studied and produced SWs. [4][5][6][7][8] Ordinarily, visible light (380-780 nm) can, in principle, be used to illuminate a room, reducing the need for interior lighting and saving more energy. Near-infrared light (NIR, 780-2500 nm) is predominantly responsible to heat up spaces. The control of transparency/color is the key to the conventional SWs that could adjust the light transmission and achieve energy savings.In fact, SWs have unique characteristics in the aspect of working principles, operation conditions, and performance. Among the studied SWs materials, unlike the electrochromic and photochromic SWs with additional energy requirements for triggering solar radiation modulation, the thermo-responsive SWs exhibit passive strategies and self-regulating ability in response to temperature variation, [9,10] whose automatic response to temperature cut down the need for switch systems and holds promise for industrial production and ease of implementation.Energy-saving and privacy are the key functionalities of next-generation thermo-responsive SWs, most of them can turn opaque to resist solar irradiation at daytime (higher environmental temperature) for energy-saving purposes, [11][12][13] meanwhile some SWs play the role of privacy protection by keeping opaque at night (lower environmental temperature). [14][15][16] There has been little research intended to integrate reduction of the solar irradiation and privacy protection, which the combination process may destroy the respective characteristics without rational design. Fortunately, prior empirical studies proved that this integration can be achieved. [17][18][19] Wang prepared dual-response hydrogels with both lower critical solution temperature (LCST) and upper critical temperature (UCST) based on cellulose-grafted polymers. [17] Gao developed a kind of mineralized supramolecular hydrogels via a simple bio-inspired physical cross-link process between amorphous CaCO 3 and poly(acrylic acid). [18] In our previous work, [19] the cationic-anionic surfactant systems were used as SWs to achieve an opacity-transparency-opacity transition as temperature changes with the adjustable switch temperatures in a wide range. However, an independent and fine adjustment on the two switch points is still to be overcome due to the mutual effect of the T k of cationic surfactant and Everlasting pursuit of high energy efficiency as well as meeting fluctuant temperatures raise various lighting requirements, which is driving the originality of thermochromic smart windows (SWs). SWs with dual-temperature response upon rational designs are identified as an effective approach to regulate solar radiation and protect privacy. Here, combining the Krafft point (T k ) of ionic surfactants and the volume phase transition temperature (VPTT) of gels toward SW materials is utilized to achieve a transition of opacity-transparence-opacity as temperature change, maintaining transparency at an intermediate temperature range with favorable optical modul...

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Potential building energy savings by passive strategies combining daytime radiative coolers and thermochromic smart windows

Cited by 30 publications

References 44 publications

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

Functional Radiative Cooling: Basic Concepts, Materials, and Best Practices in Measurements

Combining Krafft Point and Volume Phase Transition Temperature Toward Regulation of Solar Radiation and Privacy Protection

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