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Measurement of longwave radiative properties of energy-saving greenhouse screens

Authors

Adeel Rafiq
Department of Agricultural Engineering, Kyungpook National University, Daegu, Korea, Republic of.
Wook Ho Na
Smart Agriculture Innovation Center, Kyungpook National University, Daegu, Korea, Republic of.
Adnan Rasheed
https://orcid.org/0000-0002-8247-3025
Smart Agriculture Innovation Center, Kyungpook National University, Daegu, Korea, Republic of.
Jong Won Lee
Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries, Jeonju-si, Korea, Republic of.
Hyeon Tae Kim
https://orcid.org/0000-0003-0788-1536
Department of Bio-Industrial Machinery Engineering, Gyeongsang National University, Jinju, Korea, Republic of.
Hyun Woo Lee
whlee@knu.ac.kr
https://orcid.org/0000-0001-8557-2099
Department of Agricultural Engineering, Kyungpook National University, Daegu; Smart Agriculture Innovation Center, Kyungpook National University, Daegu, Korea, Republic of.

Light intensity, temperature, and humidity are key factors affecting photosynthesis, respiration, and transpiration. Among these factors, temperature is a crucial parameter to establish an optimal greenhouse climate. Temperature can be controlled by using an appropriate climate screen, which has a considerable impact on crop quantity and quality. The precise measurements of longwave radiative properties of screens are vital to the selection of the most suitable screen for greenhouses so that the desired temperature and a favorable environment can be provided to plants during nighttime. The energy-saving capability of screens can also be calculated by using these properties as inputs in a physical model. Two approaches have been reported so far in the literature for the measurement of these properties, i.e., spectrophotometry and wideband radiometry. In this study, we proposed some modified radiation balance methods for determining the total hemispherical longwave radiative properties of different screens by using wide-band radiometers. The proposed method is applicable to materials having zero porosity, partial opacity, and asymmetric screens with 100% solidity. These materials were not studied previously under natural conditions. The existing and proposed methods were applied and compared, and it was found that the radiometric values obtained from the developed methodology were similar to those previously reported in the literature, whereas the existing method gave unstable results with zero reflectance.

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How to Cite

Rafiq, A. (2021) “Measurement of longwave radiative properties of energy-saving greenhouse screens”, Journal of Agricultural Engineering, 52(3). doi: 10.4081/jae.2021.1209.
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