Measurement of longwave radiative properties of energy-saving greenhouse screens
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 c...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2021-09-01
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| Series: | Journal of Agricultural Engineering |
| Subjects: | |
| Online Access: | https://www.agroengineering.org/index.php/jae/article/view/1209 |
| _version_ | 1818788967764459520 |
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| author | Adeel Rafiq Wook Ho Na Adnan Rasheed Jong Won Lee Hyeon Tae Kim Hyun Woo Lee |
| author_facet | Adeel Rafiq Wook Ho Na Adnan Rasheed Jong Won Lee Hyeon Tae Kim Hyun Woo Lee |
| author_sort | Adeel Rafiq |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-18T14:32:05Z |
| format | Article |
| id | doaj.art-c1a2d4fbe1d54aba89c5adc6155ec51a |
| institution | Directory Open Access Journal |
| issn | 1974-7071 2239-6268 |
| language | English |
| last_indexed | 2024-12-18T14:32:05Z |
| publishDate | 2021-09-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Agricultural Engineering |
| spelling | doaj.art-c1a2d4fbe1d54aba89c5adc6155ec51a2022-12-21T21:04:33ZengPAGEPress PublicationsJournal of Agricultural Engineering1974-70712239-62682021-09-01523Measurement of longwave radiative properties of energy-saving greenhouse screensAdeel Rafiq0Wook Ho Na1Adnan Rasheed2Jong Won Lee3Hyeon Tae Kim4Hyun Woo Lee5Department of Agricultural Engineering, Kyungpook National University, DaeguSmart Agriculture Innovation Center, Kyungpook National University, DaeguSmart Agriculture Innovation Center, Kyungpook National University, DaeguDepartment of Horticulture Environment System, Korea National College of Agriculture and Fisheries, Jeonju-siDepartment of Bio-Industrial Machinery Engineering, Gyeongsang National University, JinjuDepartment of Agricultural Engineering, Kyungpook National University, Daegu; Smart Agriculture Innovation Center, Kyungpook National University, DaeguLight 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.https://www.agroengineering.org/index.php/jae/article/view/1209Emittancenet radiometerpyrgeometersky temperaturesoliditytransmittance. |
| spellingShingle | Adeel Rafiq Wook Ho Na Adnan Rasheed Jong Won Lee Hyeon Tae Kim Hyun Woo Lee Measurement of longwave radiative properties of energy-saving greenhouse screens Journal of Agricultural Engineering Emittance net radiometer pyrgeometer sky temperature solidity transmittance. |
| title | Measurement of longwave radiative properties of energy-saving greenhouse screens |
| title_full | Measurement of longwave radiative properties of energy-saving greenhouse screens |
| title_fullStr | Measurement of longwave radiative properties of energy-saving greenhouse screens |
| title_full_unstemmed | Measurement of longwave radiative properties of energy-saving greenhouse screens |
| title_short | Measurement of longwave radiative properties of energy-saving greenhouse screens |
| title_sort | measurement of longwave radiative properties of energy saving greenhouse screens |
| topic | Emittance net radiometer pyrgeometer sky temperature solidity transmittance. |
| url | https://www.agroengineering.org/index.php/jae/article/view/1209 |
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