A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas
Covering thermal screen on the front roof is one of the most general methods to improve the thermal performance of the solar greenhouse in China. Thermal screen control, however, is operator-dependent and based on empirical strategies. In order to more effectively manage the thermal screen, an optim...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/13/3/821 |
| _version_ | 1797613996340150272 |
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| author | Hanlin Liu Liangchen Lu Dapeng Sun Peng Liu Yiming Li Tianlai Li Xingan Liu |
| author_facet | Hanlin Liu Liangchen Lu Dapeng Sun Peng Liu Yiming Li Tianlai Li Xingan Liu |
| author_sort | Hanlin Liu |
| collection | DOAJ |
| description | Covering thermal screen on the front roof is one of the most general methods to improve the thermal performance of the solar greenhouse in China. Thermal screen control, however, is operator-dependent and based on empirical strategies. In order to more effectively manage the thermal screen, an optimal control method based on solar radiation and temperature difference between indoor and outdoor was established. The influence of different factors on the control of greenhouse thermal screen is systematically analyzed and the control function of the greenhouse thermal screen was calculated. The empirical control formula was established based on simulation which lasted for 62 days. As a result, the two-factor control method can significantly improve the air temperature when the thermal screen is controlled, and it can increase the average air temperature by 0.53 °C. Comparing with temperature difference, solar radiation has a greater impact on the control of thermal screen. The control method based on temperature difference and solar radiation can save 7.2% energy in winter. The research can provide reference for energy saving and automatic control of Chinese solar greenhouse. |
| first_indexed | 2024-03-11T07:03:24Z |
| format | Article |
| id | doaj.art-5b6f9252c4974261820e5a01f2419188 |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-11T07:03:24Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj.art-5b6f9252c4974261820e5a01f24191882023-11-17T09:06:41ZengMDPI AGAgronomy2073-43952023-03-0113382110.3390/agronomy13030821A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude AreasHanlin Liu0Liangchen Lu1Dapeng Sun2Peng Liu3Yiming Li4Tianlai Li5Xingan Liu6Key Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, Shenyang 110866, ChinaCollege of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, ChinaKey Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, Shenyang 110866, ChinaSchool of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, ChinaKey Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, Shenyang 110866, ChinaKey Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, Shenyang 110866, ChinaKey Laboratory of Protected Horticulture, Shenyang Agricultural University, Ministry of Education, Shenyang 110866, ChinaCovering thermal screen on the front roof is one of the most general methods to improve the thermal performance of the solar greenhouse in China. Thermal screen control, however, is operator-dependent and based on empirical strategies. In order to more effectively manage the thermal screen, an optimal control method based on solar radiation and temperature difference between indoor and outdoor was established. The influence of different factors on the control of greenhouse thermal screen is systematically analyzed and the control function of the greenhouse thermal screen was calculated. The empirical control formula was established based on simulation which lasted for 62 days. As a result, the two-factor control method can significantly improve the air temperature when the thermal screen is controlled, and it can increase the average air temperature by 0.53 °C. Comparing with temperature difference, solar radiation has a greater impact on the control of thermal screen. The control method based on temperature difference and solar radiation can save 7.2% energy in winter. The research can provide reference for energy saving and automatic control of Chinese solar greenhouse.https://www.mdpi.com/2073-4395/13/3/821Chinese solar greenhousethermal screenthermal performanceenergy balance |
| spellingShingle | Hanlin Liu Liangchen Lu Dapeng Sun Peng Liu Yiming Li Tianlai Li Xingan Liu A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas Agronomy Chinese solar greenhouse thermal screen thermal performance energy balance |
| title | A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas |
| title_full | A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas |
| title_fullStr | A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas |
| title_full_unstemmed | A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas |
| title_short | A Two-Factor Thermal Screen Control Strategy for Chinese Solar Greenhouses in High-Latitude Areas |
| title_sort | two factor thermal screen control strategy for chinese solar greenhouses in high latitude areas |
| topic | Chinese solar greenhouse thermal screen thermal performance energy balance |
| url | https://www.mdpi.com/2073-4395/13/3/821 |
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