Abstract:The heating and cooling energy consumption of buildings accounts for about 15% of national total energy consumption in the United States. In response to this challenge, many promising technologies with minimum carbon footprint have been proposed. However, most of the approaches are static and monofunctional, which can only reduce building energy consumption in certain conditions and climate zones. Here, we demonstrate a dual-mode device with electrostatically-controlled thermal contact conductance, which can a… Show more
“…To achieve switching in both and , a simple switchable device was designed based on a selective solar absorber (Cu‐Zn) for heating and a PDRC coating (PDMS‐Ag) for cooling by switching the two coatings (Figure 13E). 89 Based on this switchable coating, 19.2% of the energy used for heating and cooling can be saved in the US, which is 1.7 times higher than the only cooling mode and 2.2 times higher than the only heating mode.…”
Section: Materials Designs For Pdrcmentioning
confidence: 99%
“…(F) Schematic of the dual‐mode device at heating (left) and cooling (right) mode consisting of dual‐mode heating (Cu/Zn solar selective absorber)/cooling (PDMS/Ag cooler) material. Source : Reproduced with permission: Copyright 2020, Spring Nature 89 …”
Passive daytime radiative cooling (PDRC) dissipates terrestrial heat to the extremely cold outer space without using any energy input or producing pollution. It has the potential to simultaneously alleviate the two major problems of energy crisis and global warming. In this review, we summarize general strategies implemented for achieving PDRC and various applications of PDRC technologies. We first introduce heat transfer processes involved in PDRC, including radiative and nonradiative heat transfer processes, to evaluate the PDRC performance. Subsequently, we summarize the general material designs used for controlling PDRC performance, such as tuning the thermal mid-infrared emittance and solar reflectance. Finally, we discuss the diverse applications of PDRC technologies to overcome problems in space cooling, solar cell cooling, water harvesting, and electricity generation.
“…To achieve switching in both and , a simple switchable device was designed based on a selective solar absorber (Cu‐Zn) for heating and a PDRC coating (PDMS‐Ag) for cooling by switching the two coatings (Figure 13E). 89 Based on this switchable coating, 19.2% of the energy used for heating and cooling can be saved in the US, which is 1.7 times higher than the only cooling mode and 2.2 times higher than the only heating mode.…”
Section: Materials Designs For Pdrcmentioning
confidence: 99%
“…(F) Schematic of the dual‐mode device at heating (left) and cooling (right) mode consisting of dual‐mode heating (Cu/Zn solar selective absorber)/cooling (PDMS/Ag cooler) material. Source : Reproduced with permission: Copyright 2020, Spring Nature 89 …”
Passive daytime radiative cooling (PDRC) dissipates terrestrial heat to the extremely cold outer space without using any energy input or producing pollution. It has the potential to simultaneously alleviate the two major problems of energy crisis and global warming. In this review, we summarize general strategies implemented for achieving PDRC and various applications of PDRC technologies. We first introduce heat transfer processes involved in PDRC, including radiative and nonradiative heat transfer processes, to evaluate the PDRC performance. Subsequently, we summarize the general material designs used for controlling PDRC performance, such as tuning the thermal mid-infrared emittance and solar reflectance. Finally, we discuss the diverse applications of PDRC technologies to overcome problems in space cooling, solar cell cooling, water harvesting, and electricity generation.
“…Like cooling, subambient cooling also plays a vital role in energysaving and food and medicine storage, where thermal management at subambient temperatures is necessary. [84,[110][111][112][113][114][115][116][117][118][119][120] However, most subambient cooling technologies still rely on electrical energy. In the passive cooling technology (without electricity), evaporative cooling and radiative cooling (radiative cooling is to radiate its energy to the cold outer space [3 K] through the atmospheric window [8-13 μm] [110][111][112][113][114][115][116][117][118][119][120] ) are desirable technologies.…”
Interfacial solar steam/vapor technology uses abundant and clean solar energy and water to achieve heating and cooling, a promising technology to alleviate environmental and energy issues. To obtain higher conversion and utilization efficiency, designing and optimizing materials, structures, and devices of interfacial solar steam/vapor technologies attract the attention of the research community. Given the significant progress made in the past 5 years, it is valuable to systematically summarize and discuss recent developments and future trends in this new multidisciplinary direction. This review aims to introduce interfacial solar steam/vapor principles to realize heating and cooling and the recent progress in materials, structures, devices, and applications. Meanwhile, some unsolved scientific and technical problems with outlook will also be discussed, hoping to promote further the rapid development and application of interfacial solar steam/vapor technology in heating and cooling to alleviate energy and environmental problems.
“…A significant portion of the energy consumption in buildings is due to heating, ventilation, and air conditioning (HVAC). Numerous studies have focused on materials with tunable optical properties to regulate and convert solar energy for different applications (Li et al, 2020a, Li et al, 2020bWang et al, 2020a;Wang et al, 2020b;Wang et al, 2020c). Since windows are substantial sources of heat to the building envelopes, recent investigations on smart windows aim to reduce energy consumption while maintaining thermal comfort for the indoor environment (Khandelwal et al, 2017;Rezaei et al, 2017).…”
Smart windows that regulate solar energy by changing optical characteristics have recently gained tremendous interest for energy-saving and indoor-comfort applications. Among them, thermochromic smart windows are promising because of their simplicity for industrial production and ease of implementation. Although significant advancements have been reported on thermochromic materials, both optical and transition properties remain unsatisfactory. This review focuses on the recent advancement of thermochromic materials for smart windows in terms of operation, performance, and potential for commercialization. It discusses the parameters typically used for gauging performance and provides a summary and comparison of various promising thermochromic materials, including vanadium dioxide, hydrogels, and perovskites. The article also points the challenges in the practical implementation of these materials and provides an outlook for future development.
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