| 摘要: |
| 为了缓解夏季温室内高温导致的作物减产、绝产问题，本文给出了一种适用于夏季温室降温的辐射制冷薄膜。通过在常规近红外反射材料表面结合透明辐射层，可强化薄膜自身的天空辐射制冷效果。实验测试确定了该薄膜在不同波段的光学属性，其中光合有效辐射波段透射率为65.9%，近红外波段透射率为20.9%，中红外波段反射率为88.1%。利用温室环境模型对比不同材料覆盖下的温室气温与降温能耗。模拟结果表明，该薄膜可使上海地区密闭温室内部温度降低11.4 ℃，选择反射层与透明辐射层的降温贡献分别为6.8 ℃与4.6 ℃。使用该薄膜，可使主动降温温室的热泵能耗降低26.9%，节能增产效果显著。 |
| 关键词: 辐射制冷 数值模拟 光谱选择性 红外辐射 |
| DOI： |
| 投稿时间：2023-01-13 修订日期：2023-03-20
录用日期：2023-04-08 |
| 基金项目:上海市科技兴农项目（2019-02-08-00-08-F01124）资助。 |
|
| Investigating Transparent Radiative Film for Greenhouse Cooling |
|
Wang Chenxi1, Deng Fangfang1, Zou Hao1, Yang Ronggui2, Wang Ruzhu1
|
| (1.Institute of Refrigeration and Cryogenic Engineering, Shanghai Jiao Tong University;2.School of Energy and Power Engineering, Huazhong University of Science and Technology) |
| Abstract: |
| To alleviate the problem of crop yield reduction and extinction arising from high temperatures in summer greenhouses, a radiative cooling film for greenhouses operated in summer was investigated. The sky radiative cooling effect of a film can be strengthened by integrating a transparent radiation layer with conventional near-infrared reflective materials. The optical properties of films at different wavelengths were determined experimentally, revealing a photosynthetically effective transmissivity of 65.9%, a near-infrared transmissivity of 20.9%, and a mid-infrared reflectivity of 88.1%. A greenhouse environment model was used to compare the greenhouse temperature and energy consumption for cooling with different covering materials. The simulation results showed that the radiative film can reduce the internal temperature of a closed greenhouse in Shanghai by 11.4 ℃, and the cooling contributions of the selective near-infrared reflector and the transparent radiative layer were 6.8 ℃ and 4.6 ℃, respectively. Using this film, the energy consumption of heat pumps in an active-cooling greenhouse can be reduced by 26.9%. This film offers a promising solution for achieving energy-efficient and high-yield agriculture during the hot summer. |
| Key words: radiative cooling numerical simulation spectral selectivity infrared radiation |
