Study on the Change Rate of the Indoor Temperature of a Sunken Solar Greenhouse

CHENG, Weiwei; LIU, Zhonghua

doi:10.35633/inmateh-68-12

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…A study of the three-dimensional thermal environment of a sunken solar greenhouse can therefore provide a basis for determining plant growth and development, wall insulation and soil heat transfer. Research on the thermal environment of solar greenhouses is mainly concentrated in China, and the main research directions involve indoor environmental models (Zhang et al, 2018;Xu et al, 2019), indoor soil heat transfer models (Zhang et al, 2012), heat transfer models, materials, and types of indoor walls Ma et al, 2019;Bao et al, 2019). Most foreign greenhouses are large, continuous structures, and relatively little research has been conducted on the microclimate of solar greenhouses (Ahamed et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermal Environment and Marginal Effects of a Sunken Solar Greenhouse

Cheng,

Wang,

Wang

et al. 2024

Eng. Agríc.

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A sunken solar greenhouse is a unique structure used in China that has good thermal performance and a low cost. To explore the thermal environment and the marginal effect area under the trellis membrane in a sunken solar greenhouse, daytime heat absorption and nighttime exothermic models of the greenhouse were established based on existing theories and hypotheses. An experimental study of the three-dimensional thermal environment of a solar greenhouse was also conducted in the Jinzhong Basin of Shanxi Province. The daytime heat absorption model described how the internal thermal environment of the greenhouse changes in three dimensions, while the nighttime model calculated the amount of heat released at night. The results showed that the rate of change in the maximum temperature difference along the height direction in the greenhouse was 13 times that along the vertical direction, and three times that along the horizontal direction. We also observed that the marginal effect area under the membrane varied over time and by month. The minimum value of the marginal effect area occurred at the middle cross-section, spanning the middle position of the greenhouse, and the maximum height was 2.7 m. The results of this study can provide theoretical guidance and experimental data for the thermal environment of greenhouses of the same type in the Jinzhong Basin of Shanxi Province, thus providing a basis for environmental regulation and low-temperature margins in greenhouses.

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Section: Introductionmentioning

confidence: 99%

Study of the Thermal Environment and Marginal Effects of a Sunken Solar Greenhouse

Cheng,

Wang,

Wang

et al. 2024

Eng. Agríc.

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The Marginal Effect and LSTM Prediction Model under the Chinese Solar Greenhouse Film

Cheng,

Wang,

Wang

et al. 2024

Agriculture

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The solar greenhouse is a significant agricultural facility in China. It enables the cultivation of crops during periods that do not coincide with the natural growing season, thus alleviating the pressure on the supply of fruits and vegetables during the winter months. The primary rationale behind the necessity of greenhouse cultivation lies in the fact that the temperature conditions conducive to optimal crop growth can be precisely replicated within this controlled environment. However, it is important to acknowledge that a distinct low-temperature area persists under the film during the overwintering period, with the precise delineation of its boundaries and distribution patterns remaining uncertain. In order to investigate the characteristics of the temperature distribution within the marginal region under the solar greenhouse film, experimental studies, CFD simulations, and LSTM prediction models were employed. The results of these studies indicate that, during the overwintering period, a low-temperature region was observed with approximately equal temperatures near the film membrane. The maximum horizontal distance from the south-side bottom corner was 6130 mm, while the minimum height from the ground was 600 mm. The lowest temperature in the low-temperature region was 4 °C, and the maximum observed temperature difference within the same period in different months was 1 °C. Additionally, a region of elevated temperatures was observed under the film. The lowest temperature in this region was 36.7 °C, and the highest temperature point was within the optimal range for crop growth. The CFD numerical simulation results were consistent with the actual observations, and the LSTM prediction model demonstrated high reliability. The findings of this study offer a theoretical foundation for the distribution of high and low temperatures in solar greenhouses. Furthermore, the developed prediction model provides the necessary buffer time for control, thus enhancing the efficiency of greenhouse cultivation.

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Study on the Mechanism of Indoor Temperature and Humidity Change in the Sunken Solar Greenhouse During the Smothering Period

CHENG

You

Tian

et al. 2023

INMATEH

Self Cite

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A sunken solar greenhouse is the original type of greenhouse in China, its soil wall thermal storage performance is better and low cost. Higher benefits of stereoscopic planting in sunken solar greenhouses, while repeated use of the substrate can produce pathogens, so high-temperature smothering is used for sterilization in the summer months of June to August. To investigate the mechanism of indoor temperature and humidity variation and fungicidal effect in a sunken solar greenhouse, a single cross-sectional test of temperature and humidity in sunken solar greenhouse during the smothering period was conducted using wireless sensors. The results showed that: The maximum value of indoor temperature at noon was 69.5°C the temperature value of all measurement points was greater than 50°C for 3h, when removing the measurement points at the upper surface of the ground, the relative humidity value of other measurement points was less than 60% for 5h. During the daytime period, when the indoor temperature is greater than 28°C in the interval 7:00-12:00, the initial relative humidity value of each measurement point is located at 70%-85%; when the weighted temperature of each measurement point starts to rise at a rate of 1.1°C/10min, the weighted humidity of each measurement point declining is 1.3%/10min; the determination of the rate of change of indoor temperature and humidity during the daytime and the starting value can provide a basis for indoor plants to take measures to sterilize at high temperature.

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Study on the Change Rate of the Indoor Temperature of a Sunken Solar Greenhouse

Cited by 6 publications

References 18 publications

Study of the Thermal Environment and Marginal Effects of a Sunken Solar Greenhouse

Study of the Thermal Environment and Marginal Effects of a Sunken Solar Greenhouse

The Marginal Effect and LSTM Prediction Model under the Chinese Solar Greenhouse Film

Study on the Mechanism of Indoor Temperature and Humidity Change in the Sunken Solar Greenhouse During the Smothering Period

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