Wang Yu-Xiao; Cheng Ze-Shuai; Jiang Ke-Yang; Wei Lin-Yang; Li Xiu-Ming

doi:10.7498/aps.73.20240863

Abstract

Energy and environmental challenges caused by the excessive consumption of fossil fuels are major concerns worldwide, and the use of automotive air conditioning can increase total fuel consumption by 10% to 30%, thereby exacerbating these problems. To reduce the energy consumption for automotive air conditioning, a multilayer-film design based on radiative cooling and electrochromic modulation is proposed for regulating the temperature inside vehicles. The designed multilayer-film not only passively realizes temperature drop but also actively regulates the entry of solar radiation, which can help the vehicle air conditioning system to adjust the interior temperature autonomously. To verify its effectiveness, a film-applied empty box device is designed for radiometric temperature measurement. Experimental results indicate that the maximum interior temperature drop of the multilayer film increases by approximately 9.8 ℃ compared with that of single-layer films in the sunlight irradiation, and dynamic temperature regulation of about 4.6 ℃ can be achieved by adjusting the transmittance of the multilayer film. To study the environmental adaptability of the multilayer film, experiments are conducted on an outdoor film-applied device during the summer and winter in Shenyang, China ($\rm 41^\circ44'N, 123^\circ39'E$), the place which is characterized by a typical temperate continental climate. Results indicate that under high temperature conditions of 30–40 ℃ in summer, the maximum internal temperature drop of the multilayer film reaches 12.9 ℃; while under low temperature conditions of 0–15 ℃ in autumn and winter, the maximum internal temperature drop is only 1.9 ℃, preventing the interior temperature from being too low. In addition, the maximum interior temperature drop increases with the solar radiation intensity and ambient temperature increasing. Therefore, the proposed multilayer-film design, with its potential for temperature self-regulation, provides a promising solution for reducing energy consumption and improving passenger comfort.

Keywords:

Authors and contacts

Corresponding author: Wei Lin-Yang, weilinyang@smm.neu.edu.cn ; Li Xiu-Ming, lixiuming@smm.neu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 52106079), the Joint Funds of the Natural Science Foundation of Liaoning Province of China (Grant No. 2023-MSBA-059), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. N2325021).

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参数	百分数/%	参数	百分数/%
反射率	8	光太阳能增益系数	1.24
穿透率	66	太阳能总隔断率	47
紫外线阻隔率	99.9	热增益减少率	28.67
太阳能辐射吸收系数	0.53	炫光减少率	26

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参数	数值	参数	数值
穿透率(30 V)%	73.5	功耗/(W·m^–²)	6
穿透率(15 V)/%	65.5	使用寿命/h	>50000
穿透率(0 V)/%	10.4	工作温度/℃	–20—70
紫外线隔断率/%	98	可视角度/(°)	120
工作电压/V	0—30	基材厚度/μm	600±50

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Vol. 73, Issue 21 - 2024-11-05

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Corresponding author: Wei Lin-Yang, weilinyang@smm.neu.edu.cn ; Li Xiu-Ming, lixiuming@smm.neu.edu.cn

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