Near-Infrared Reflective Greenhouse Covering: A Novel Strategy for Electricity-Free Cooling

IF 2.3 Q1 AGRICULTURE, MULTIDISCIPLINARY ACS agricultural science & technology Pub Date : 2024-01-02 DOI:10.1021/acsagscitech.3c00281
Song Zhang, Zhang Chen, Chuanxiang Cao and Yanfeng Gao*, 
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Abstract

Traditional cooling strategies for greenhouses commonly result in significant electricity consumption and a substantial release of carbon dioxide emissions. Considering the industrial fabrication process for the greenhouse covering film and the thermal management theory, we developed a composite greenhouse covering film that incorporates titanium dioxide into polyethylene to achieve near-infrared reflection. The film demonstrates an impressive near-infrared reflectance of 54.4% within the wavelength range of 780–2500 nm. A tunnel-type greenhouse demo comparative test results show that the composite film can effectively decrease the average temperature inside the greenhouse by 6.7 °C in comparison to the pure polyethylene film. The reduction implies a significant annual saving in cooling electricity at the national level of 2151912.3 MW h, along with an annual CO2 emission reduction by 1250261.1 tons.

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近红外反射温室覆盖物:无电力降温的新策略
传统的温室降温策略通常会导致大量的电力消耗和二氧化碳排放。考虑到温室覆盖膜的工业制造工艺和热管理理论,我们开发了一种复合温室覆盖膜,在聚乙烯中加入二氧化钛以实现近红外反射。该薄膜在 780-2500 纳米波长范围内的近红外反射率高达 54.4%,令人印象深刻。隧道式温室演示对比测试结果表明,与纯聚乙烯薄膜相比,复合薄膜可有效降低温室内平均温度 6.7 °C。这意味着每年可为国家节省 2151912.3 兆瓦时的冷却电力,同时每年还可减少 1250261.1 吨的二氧化碳排放量。
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