Study on the impact of intermittent heating control strategy system on greenhouse thermal environment
The heating imbalance in solar-powered heating greenhouses (SHG) severely constrains both energy supply efficiency and crop yield. This study proposes the principle of Thermal Intermittent Heating (TIH), unveiling the differentiated regulatory mechanisms by which the duty cycle (∅) governs thermal d...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-08-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25007117 |
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| author | Mingzhi Zhao Yingjie Liu Zheng Han Chun Chang Daorina Bao Rasakhodzhaev Bakhramzhan Sabirovich Akhadou Jobir |
| author_facet | Mingzhi Zhao Yingjie Liu Zheng Han Chun Chang Daorina Bao Rasakhodzhaev Bakhramzhan Sabirovich Akhadou Jobir |
| author_sort | Mingzhi Zhao |
| collection | DOAJ |
| description | The heating imbalance in solar-powered heating greenhouses (SHG) severely constrains both energy supply efficiency and crop yield. This study proposes the principle of Thermal Intermittent Heating (TIH), unveiling the differentiated regulatory mechanisms by which the duty cycle (∅) governs thermal dynamics in both aerial greenhouse environments and subsurface soil layers. Under the greenhouse thermal environment conditions, the operational mode with ∅ = 0.67 (control scheme (2,1)) demonstrates optimal thermal stratification adaptation through an 8-h heating/4-h intermittent cycle. This configuration achieved the highest Comprehensive Energy Energy Efficiency Index (COP) of 88.7 % in the fourth layer (group maximum), along with minimal thermal fluctuations indicated by σT (2.82 °C) and CV (11.12 %). The strategy effectively compensates for thermal dissipation in upper zones caused by buoyant airflow (48 % elevation in mean temperature), while preventing excessive top-layer overheating observed in continuous heating (∅ = 1) scenarios, which exhibited 128 % surge in σT. Within the soil layer (0.1–0.2m depth), this ∅ value synchronously optimizes thermal penetration intensity and stability: The first-layer COP reached 182.39 (T‾ = 19.72 °C) with σT merely 1.85 °C, where heating duration precisely matched the soil's thermal diffusion period (6–8 h). Whereas ∅ = 1 induced 197 % surge in soil σT (5.51 °C vs. optimal condition), and ∅ = 0.13 resulted in 22.6 % reduction in deep-layer temperature mean. The study demonstrates COP's capacity to quantify heterogeneous thermal responses across media, revealing that moderate ∅ = 0.67 regulates thermal inertia to achieve multi-objective synergy in ''energy consumption-uniformity-thermal penetration''. This establishes a thermodynamic analysis framework for hierarchical heating system optimization. |
| format | Article |
| id | doaj-art-dbfd645a1bc64bc695b2df90cc534bef |
| institution | OA Journals |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-dbfd645a1bc64bc695b2df90cc534bef2025-08-20T02:31:11ZengElsevierCase Studies in Thermal Engineering2214-157X2025-08-017210645110.1016/j.csite.2025.106451Study on the impact of intermittent heating control strategy system on greenhouse thermal environmentMingzhi Zhao0Yingjie Liu1Zheng Han2Chun Chang3Daorina Bao4Rasakhodzhaev Bakhramzhan Sabirovich5Akhadou Jobir6College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China; Engineering Center of Solar Energy Utilization Technology, Inner Mongolia University of Technology, Hohhot, 010051, ChinaCollege of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China; Engineering Center of Solar Energy Utilization Technology, Inner Mongolia University of Technology, Hohhot, 010051, China; Corresponding author. College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, 010051, ChinaSchool of Physics and Intelligent Manufacturing Engineering, Chifeng University, Chifeng, 024000, ChinaCollege of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China; Engineering Center of Solar Energy Utilization Technology, Inner Mongolia University of Technology, Hohhot, 010051, ChinaCollege of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China; Engineering Center of Solar Energy Utilization Technology, Inner Mongolia University of Technology, Hohhot, 010051, ChinaNational Scientific Institute of Renewable Energy Source Under Ministry of Energy of the Republic of Uzbekistan, Bodomzor yoli Str., 2-B, 100084, Tashkent, UzbekistanNational Scientific Institute of Renewable Energy Source Under Ministry of Energy of the Republic of Uzbekistan, Bodomzor yoli Str., 2-B, 100084, Tashkent, UzbekistanThe heating imbalance in solar-powered heating greenhouses (SHG) severely constrains both energy supply efficiency and crop yield. This study proposes the principle of Thermal Intermittent Heating (TIH), unveiling the differentiated regulatory mechanisms by which the duty cycle (∅) governs thermal dynamics in both aerial greenhouse environments and subsurface soil layers. Under the greenhouse thermal environment conditions, the operational mode with ∅ = 0.67 (control scheme (2,1)) demonstrates optimal thermal stratification adaptation through an 8-h heating/4-h intermittent cycle. This configuration achieved the highest Comprehensive Energy Energy Efficiency Index (COP) of 88.7 % in the fourth layer (group maximum), along with minimal thermal fluctuations indicated by σT (2.82 °C) and CV (11.12 %). The strategy effectively compensates for thermal dissipation in upper zones caused by buoyant airflow (48 % elevation in mean temperature), while preventing excessive top-layer overheating observed in continuous heating (∅ = 1) scenarios, which exhibited 128 % surge in σT. Within the soil layer (0.1–0.2m depth), this ∅ value synchronously optimizes thermal penetration intensity and stability: The first-layer COP reached 182.39 (T‾ = 19.72 °C) with σT merely 1.85 °C, where heating duration precisely matched the soil's thermal diffusion period (6–8 h). Whereas ∅ = 1 induced 197 % surge in soil σT (5.51 °C vs. optimal condition), and ∅ = 0.13 resulted in 22.6 % reduction in deep-layer temperature mean. The study demonstrates COP's capacity to quantify heterogeneous thermal responses across media, revealing that moderate ∅ = 0.67 regulates thermal inertia to achieve multi-objective synergy in ''energy consumption-uniformity-thermal penetration''. This establishes a thermodynamic analysis framework for hierarchical heating system optimization.http://www.sciencedirect.com/science/article/pii/S2214157X25007117Greenhouse heating systemDuty cycle optimizationComprehensive energy efficiency coefficientThermodynamic stratification characteristicsTemperature fluctuation suppression |
| spellingShingle | Mingzhi Zhao Yingjie Liu Zheng Han Chun Chang Daorina Bao Rasakhodzhaev Bakhramzhan Sabirovich Akhadou Jobir Study on the impact of intermittent heating control strategy system on greenhouse thermal environment Case Studies in Thermal Engineering Greenhouse heating system Duty cycle optimization Comprehensive energy efficiency coefficient Thermodynamic stratification characteristics Temperature fluctuation suppression |
| title | Study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| title_full | Study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| title_fullStr | Study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| title_full_unstemmed | Study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| title_short | Study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| title_sort | study on the impact of intermittent heating control strategy system on greenhouse thermal environment |
| topic | Greenhouse heating system Duty cycle optimization Comprehensive energy efficiency coefficient Thermodynamic stratification characteristics Temperature fluctuation suppression |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25007117 |
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