Experimental study on indoor environmental factors of double film solar greenhouse and traditional Chinese greenhouse in cold region

Liu, Yerui; Liu, Xiaomin; Chai, Yune; Yang, Linyan; Wei, Wei; Gu, Jinshou; Hong, Kui

doi:10.1177/01445987221098099

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…Table 1 shows that although the temperature in the greenhouse averaged 19.67 °C in early winter, it occasionally exceeded 27.03 °C. According to Liu et al [ 17 ], the highest temperature in the double-film greenhouse was 28.18 °C, the maximum temperature difference was 12.78 °C, and the conventional single-foil greenhouse had a maximum temperature of 15.4 °C. In Yu Zhong County, Lanzhou, Gansu Province, the mean and minimum air temperatures in the double-foil solar greenhouse are 6.92 °C and 5.51 °C higher than those in the single-foil solar greenhouse, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, all five sensors showed that the soil temperature was higher in early winter than in the summer. Similarly, research on the average soil temperature in the double-foil greenhouse and standard single-foil greenhouse also showed that it fluctuated over time [ 17 ]. In the double-foil solar greenhouse, the soil temperatures at depth are lower throughout the day than in the conventional single-foil greenhouse, and the variance in soil surface temperature is significantly greater in the double-foil greenhouse than in the conventional greenhouse.…”

Section: Resultsmentioning

confidence: 99%

“…The soil humidity at a 10 cm depth in the double-foil solar greenhouse averaged 77.71% per day, while the soil humidity at the same depth in the single-foil greenhouse averaged 88.11% per day, which is 10.4% higher than in the double-foil greenhouse [ 17 ]. At a depth of 20 cm, the average daily soil humidity content is 62.53%, while in a typical single-layer greenhouse, it is 74.83%.…”

Section: Resultsmentioning

confidence: 99%

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The Influence of External Parameters on the Ripeness of Pumpkins

Emah,

Hu,

Boamah

et al. 2023

Sensors

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Growing pumpkins in controlled environments, such as greenhouses, has become increasingly important due to the potential to optimise yield and quality. However, achieving optimal environmental conditions for pumpkin cultivation requires precise monitoring and control, which can be facilitated by modern sensor technologies. The objective of this study was to determine the optimal placement of sensors to determine the influence of external parameters on the maturity of pumpkins. The greenhouse used in the study consisted of a plastic film for growing pumpkins. Five different sensors labeled from A1 to A5 measured the air temperature, humidity, soil temperature, soil humidity, and illumination at five different locations. We used two methods, error-based sensor placement and entropy-based sensor placement, to evaluate optimisation. We selected A3 sensor locations where the monitored data were close to the reference value, i.e., the average data of all measurement locations and parameters. Using this method, we selected sensor positions to monitor the influence of external parameters on the maturity of pumpkins. These methods enable the determination of optimal sensor locations to represent the entire facility environment and detect areas with significant environmental disparities. Our study provides an accurate measurement of the internal environment of a greenhouse and properly selects the base installation locations of sensors in the pumpkin greenhouse.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of External Parameters on the Ripeness of Pumpkins

Emah,

Hu,

Boamah

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The findings demonstrated that ventilation rate, external temperature, and humidity affected internal conditions, with up to 5.1 • C and 8.16 • C vertical temperature differences in mature and young plant greenhouses, respectively. Liu et al [24] compared the indoor environmental factors in a double-film solar greenhouse and in a traditional Chinese greenhouse that were both in a cold region. The results showed that the solar greenhouse had a higher air temperature, soil temperature, and humidity, while the traditional greenhouse had lower air temperature and humidity.…”

Section: Introductionmentioning

confidence: 99%

Spatial, Temporal, and Vertical Variability of Ambient Environmental Conditions in Chinese Solar Greenhouses during Winter

Reza,

Islam,

Iqbal

et al. 2023

Applied Sciences

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The monitoring and control of environmental conditions are crucial as they influence crop quality and yield in Chinese solar greenhouses (CSGs). The objectives of this study were to assess the spatial, temporal, and vertical variability of major environmental parameters in CSGs during winter and to provide greenhouse climate/microclimate characteristics in order to facilitate the monitoring and control of greenhouse environmental conditions. A wireless sensor network (WSN) was deployed in two CSGs: one with crops and one without. Sensors were placed at different locations inside and outside the greenhouses, and the air temperature, humidity, CO2 concentration, light intensity, solar radiation, and wind conditions were measured and analyzed. Significant variability in the spatial, temporal, and vertical distribution of environmental factors was observed in both greenhouses. The average minimum and maximum temperatures and humidity inside the CSG with crops were 9.96 °C (4:00 h) and 24.5 °C (12:00 h), and 32.6% (12:00 h) and 92.1% (5:00 h), respectively. The temperature difference was 2.2 °C between layers in the CSG without crops and 1.4 °C between layers in the CSG with crops. The CO2 concentration in the different layers inside the CSG with crops was highest at night. The average maximum light intensity inside the CSG with crops was 32,660.19 lx, 36,618.12 lx, and 40,660.48 lx (12:00 h to 13:00 h) in the bottom, middle, and top layers, respectively. Sensor positioning in the greenhouse was evaluated by considering the sensors’ data variability. The findings of this study could aid in the development of a better monitoring and control system for CSG’s microclimate during winter. More research is needed on greenhouse microclimate control systems based on this variability analysis, which could improve crop quality and yield in greenhouses.

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“…Liu tested indoor environmental factors variation of the double film solar greenhouse and the ordinary single‐film greenhouse in winter. The value of environmental factors of light, heat, water, and air system in double film greenhouse is more stable than that in single film ordinary greenhouse (Liu, Liu, et al, 2022). At present, more researchers are interested in the influence of solar greenhouse itself on the environmental parameters inside the greenhouse.…”

Section: Introductionmentioning

confidence: 99%

A temperature and vent opening couple model in solar greenhouses for vegetable cultivation based on dynamic solar heat load using computational fluid dynamics simulations

Zhang

et al. 2022

J Food Process Engineering

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The application of microclimate control technology in solar greenhouses under a dynamic solar heat load is of great significance for current research on energy consumption and clean efficiency in greenhouses. In particular, solar greenhouses use natural ventilation for the rapid exchange of energy and heat inside and outside the greenhouse. In this study, we proposed a coupling between the natural ventilation model and the computational fluid dynamics (CFD) model to investigate the relationship between ventilation and temperature in solar greenhouses, thus providing a more in‐depth understanding of greenhouse ventilation demands. The influence of vents on the greenhouse microclimate was simulated under dynamic solar thermal loads using CFD to propose a coupling between the natural ventilation model and the CFD model to investigate the relationship between ventilation and temperature in solar greenhouses. Furthermore, we analyzed the daily and annual greenhouse micro‐climates to provide a more in‐depth understanding of greenhouse ventilation demands. Results highlighted the impact of the outdoor wind speed and vent opening on greenhouse ventilation rates and temperatures, with a linear relationship between greenhouse ventilation rates and outdoor wind speed. The outdoor wind speed had little effect on the ventilation rate for reduced vent openings, while the indoor temperature decreased as outdoor wind speed increased. The average temperature in the greenhouse was observed to be greatly affected by wind speeds less than 3 m/s. Simultaneously, opening the greenhouse vent resulted in a fall in indoor temperatures, with openings less than 60% causing the greatest reduction, (the maximum temperature drift was determined as 9.33%). Practical Applications With the ability to conserve energy and reduce pollution, solar greenhouses are crucial to China's contribution and the global agricultural industry. Moreover, they are associated with improvements in the competitiveness of modern agriculture, particularly in the current era of rapidly increasing costs and pollution from fossil fuels and traditional energy. This study provides a basic reference for the natural ventilation of vents in the control of indoor air temperatures under dynamic solar thermal loads. The results can be used as a theoretical basis for the production management of solar greenhouses, and have an important practical significance for the subsequent automation and intelligent control of greenhouse environments.

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Experimental study on indoor environmental factors of double film solar greenhouse and traditional Chinese greenhouse in cold region

Cited by 5 publications

References 32 publications

The Influence of External Parameters on the Ripeness of Pumpkins

The Influence of External Parameters on the Ripeness of Pumpkins

Spatial, Temporal, and Vertical Variability of Ambient Environmental Conditions in Chinese Solar Greenhouses during Winter

A temperature and vent opening couple model in solar greenhouses for vegetable cultivation based on dynamic solar heat load using computational fluid dynamics simulations

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