Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.3390/en13020472 |
| Diffusion Characteristics of Solar Beams Radiation Transmitting through Greenhouse Covers in Arid Climates | |
| Al-Helal, Ibrahim1; Alsadon, Abdullah2; Shady, Mohamed1; Ibrahim, Abdullah2; Abdel-Ghany, Ahmed1 | |
| 通讯作者 | Al-Helal, Ibrahim ; Abdel-Ghany, Ahmed |
| 来源期刊 | ENERGIES
 |
| EISSN | 1996-1073 |
| 出版年 | 2020 |
| 卷号 | 13期号:2 |
| 英文摘要 | In hot and sunny regions, extensive solar radiation transmitted into greenhouses makes it essential to select a greenhouse cover with specific characteristics. Reflection and diffusion are the most important properties of covers for reducing solar heating load and scattering solar beams for better growth of plants. Three types of plastic films that are commonly used for covering greenhouses in arid climate were selected for this study. These were reflective-diffusive (RDF), diffusive (DF), and locally produced (CF) films. The films were used to cover three identical twin-span greenhouse models; the radiation components, air temperature (T-i), and relative humidity (RHi) were measured in each model. Transmission of solar radiation through each cover was characterized by determining: (i) The beam that is diffused during transmission, and (ii) the unscattered beam that is transmitted directly through the film. The results show that the diffuse radiation transmitted through the DF, RDF, and CF covers was enhanced, respectively by 77%, 85%, and 109% as a result of diffusing 34%, 33%, and 43% of the transmitted beam radiation by the DF, RDF, and CF covers, respectively during transmission. The diffusive nature of the tested covers increased the ratio of diffuse to direct beam radiation (D/B) from 0.3 outside the greenhouse to 0.77, 0.69, and 0.95 inside a greenhouse covered with DF, RDF, and CF, respectively. At around noon, the CF cover decreased T-i by about 5-10 degrees C and increased RHi by about 3%-5% compared to those under the DF and RDF covers. However, DF and RDF covers showed almost similar effects in T-i and RHi. The low-price CF cover showed higher diffusive-radiative properties than DF and RDF covers and can serve effectively in arid climate as an alternative covering material. |
| 英文关键词 | greenhouse plastic film solar beam radiation transmission diffusion reflection |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Saudi Arabia |
| 开放获取类型 | gold |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000520432300186 |
| WOS关键词 | COOL PLASTIC FILMS ; TRANSMISSION ; SCATTERING ; GROWTH ; SINGLE |
| WOS类目 | Energy & Fuels |
| WOS研究方向 | Energy & Fuels |
| 来源机构 | King Saud University |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/314390 |
| 作者单位 | 1.King Saud Univ, Dept Agr Engn, Coll Food & Agr Sci, POB 2460, Riyadh 11451, Saudi Arabia; 2.King Saud Univ, Dept Plant Prod, Coll Food & Agr Sci, POB 2460, Riyadh 11451, Saudi Arabia |
| 推荐引用方式 GB/T 7714 | Al-Helal, Ibrahim,Alsadon, Abdullah,Shady, Mohamed,et al. Diffusion Characteristics of Solar Beams Radiation Transmitting through Greenhouse Covers in Arid Climates[J]. King Saud University,2020,13(2). |
| APA | Al-Helal, Ibrahim,Alsadon, Abdullah,Shady, Mohamed,Ibrahim, Abdullah,&Abdel-Ghany, Ahmed.(2020).Diffusion Characteristics of Solar Beams Radiation Transmitting through Greenhouse Covers in Arid Climates.ENERGIES,13(2). |
| MLA | Al-Helal, Ibrahim,et al."Diffusion Characteristics of Solar Beams Radiation Transmitting through Greenhouse Covers in Arid Climates".ENERGIES 13.2(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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