4.7 Article

Testing organic photovoltaic modules for application as greenhouse cover or shading element

期刊

BIOSYSTEMS ENGINEERING
卷 184, 期 -, 页码 24-36

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.biosystemseng.2019.05.003

关键词

Organic materials; Photovoltaic panel; Solar energy; Efficiency; Protected crops

资金

  1. Chief Scientist of the Ministry of Agriculture and Rural Development of Israel [20-12-0027]
  2. BARD, The United States - Israel Binational Agricultural Research and Development fund [US-4885-16]
  3. Plant Production & Marketing Board of Israel [459-4540-17]

向作者/读者索取更多资源

This study examines the feasibility of using semi-transparent, flexible organic photovoltaic (OPV) modules as greenhouse shading material. By using such modules, it may be possible to utilise existing greenhouse-based agricultural areas for electricity production. Using OPV modules to shade greenhouses and reduce excess solar energy may result in reduced heat load on the crop on the one hand, and use of renewable energy on the other. We examined the radiometric and thermal properties of an OPV module. Module transmissivity was measured under outdoor conditions at four different angles of radiation incidence: 0, 21, 41 and 46 degrees. Simultaneously, the open-circuit voltage, and short-circuit current of the module were recorded for power and efficiency calculations. Supplementary laboratory measurements of transmissivity, reflectivity and absorptivity were performed with a spectroradiometer. To further characterise the OPV module, its overall heat-transfer coefficient (U value) was determined. The examined module had about 20% transmissivity, 15% reflectivity and 65% absorptance in the photosynthetically active radiation (PAR) range. The mean daily power conversion efficiency of the module was about 0.8% and the overall heat transfer coefficient U, was about 6.0 Wm(-2) K-1. The temperature of a module placed on the polyethylene cover of a greenhouse high tunnel was about 50-55 degrees C at midday. Thermal images of the module revealed non-uniform heat distribution, with temperature differences between regions reaching up to 7.5 degrees C. OPV modules appear to be suitable for greenhouse shading and electricity generation but currently they are too expensive and their life duration is relatively short. (C) 2019 IAgrE. Published by Elsevier Ltd. All rights reserved.

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