Abstract
Thermochromic smart windows technology can intelligently regulate indoor solar radiation by changing indoor light transmittance in response to thermal stimulation, thus reducing energy consumption of the building. In recent years, with the development of new energy-saving materials and the combination with practical technology, energy-saving smart windows technology has received more and more attention from scientific research. Based on the summary of thermochromic smart windows by Yi Long research groups, this review described the applications of thermal responsive organic materials in smart windows, including poly(N-isopropylacrylamide) (PNIPAm) hydrogels, hydroxypropyl cellulose (HPC) hydrogels, ionic liquids and liquid crystals. Besides, the mechanism of various organic materials and the properties of functional materials were also introduced. Finally, opportunities and challenges relating to thermochromic smart windows and prospects for future development are discussed.
Highlights
Most organic polymer materials are environmentally friendly and suitable to use in thermochromic smart windows [21].3 of 25
We believe that this new generation of autonomous passive smart windows can be When PNIPAm/antimony-doped tin oxide (ATO) composite hydrogels (PATO) are exposed to sunlight irradiation used to adapt to solar modulation
Multi-functional liquid crystal smart windows liquid have been commercialized, and there are some studies in the literature, such as cholesteric crystal (CLC) units, polymerare some studies the literature, cholesteric liquid crystal (CLC)
Summary
The energy crisis is a major problem threatening human society. In recent years, heating, ventilation and refrigeration account for 43% of the global primary energy consumption [1], and the problem of building energy consumption [2] has attracted widespread attention [3]. Compared with the development of an intelligent regulation system on the top of wall, window renovation is the most effective and simple way to realize the intelligent heat transfer controlling and effectively reducing the total energy consumption of the buildings [9]. To solve theheating above or problems, thermochromic smarttransmittance, windows [12]reflectivity have beenand recolor of thermochromic materials will change significantly. Most organic polymer materials are environmentally friendly and suitable to use in thermochromic smart windows [21].3 of 25.
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