New insights of designing thermal insulation and heat storage of Chinese solar greenhouse in high latitudes and cold regions

Liu, Xingan; Wu, Xiaoyang; Xia, Tianyang; Fan, Zilong; Shi, Wenbin; Li, Yiming; Li, Tianlai

doi:10.1016/j.energy.2021.122953

Cited by 44 publications

(16 citation statements)

References 52 publications

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“…As of 2022, Chinese solar greenhouses (CSGs) account for 29% of Chinese facilities' agriculture cultivation areas. During cold winters, these are an important way to provide fresh vegetables and fruits in the Huang-Huai-Hai Plain and northeast and northwest regions of China [1]. Proper temperature and relative humidity are two key microclimate factors for guaranteeing crop yield and quality in CSGs [2].…”

Section: Introductionmentioning

confidence: 99%

Configuration Optimization of Temperature–Humidity Sensors Based on Weighted Hilbert–Schmidt Independence Criterion in Chinese Solar Greenhouses

Song,

Liu,

Liu

et al. 2024

Agriculture

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For cost-sensitive Chinese solar greenhouses (CSGs) with an uneven spatial distribution in temperature and humidity, there is a lack of effective strategies for sensor configuration that can reduce sensor usage while monitoring the microclimate precisely. A configuration strategy for integrated temperature–humidity sensors (THSs) based on the improved weighted Hilbert–Schmidt independence criterion (HSIC) is proposed in this paper. The data independence of the THSs in different sites was analyzed based on the improved HSIC, and the selection priority of the THSs was ranked based on the weighted independence of temperature and humidity. Then, according to different cost constraints and monitoring requirements, suitable THSs could be selected sequentially and constitute the monitoring solution. Compared with the original monitoring solution containing twenty-two THSs, the optimized solution used only four THSs (S6, S9 and H6, H5) under strict cost constraints, with a maximum RMSE of the temperature and relative humidity of 0.6 °C and 2.30%, as well as a maximum information gain rate (IGR) of 9.47% and 10.0%. If higher monitoring precision is required, we can increase the THS usage with a greater budget. The optimized solution with six THSs (S6, S9, S8 and H6, H5, H2) could further reduce the maximum RMSE of the temperature and relative humidity to 0.33 °C and 1.10% and the IGR to 6.9% and 8.7%. This indicated that the proposed strategy could use much fewer THSs to achieve accurate and comprehensive monitoring, which would provide efficient and low-cost solutions for CSG microclimate monitoring.

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Section: Introductionmentioning

confidence: 99%

Configuration Optimization of Temperature–Humidity Sensors Based on Weighted Hilbert–Schmidt Independence Criterion in Chinese Solar Greenhouses

Song,

Liu,

Liu

et al. 2024

Agriculture

View full text Add to dashboard Cite

show abstract

“…Chinese solar greenhouse (CSG) is a kind of solar greenhouse that uses solar radiation as a heat source [1,2]. It can create a suitable environment for crop growth by artificial means and promote the economic development of national crops [3].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Solar Array Tube on Thermal Environment of Greenhouse

et al. 2023

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The stratum and microenvironment temperatures in a greenhouse are important factors that affect crop yield. In order to solve the problem of temperature imbalance caused by solar radiation in greenhouses, this paper proposes the application of a solar radiation array tube in a greenhouse. By adding water or phase change materials to the array tube, the influence of the array tube on the formation and microenvironment temperature changes was studied, and a 10-day test was carried out. A test group and control group were set up to monitor test results, and the ground was divided into six areas. The depths of each area were 10 cm, 30 cm, and 50 cm, and the heights of the greenhouse centers were 0 cm, 30 cm, 60 cm, 90 cm, 120 cm, 150 cm, and 180 cm. Via an analysis of the test results obtained for the formation and microenvironment temperature, the arrangement of the array tube was found to exert a constant temperature regulation effect on the microenvironment of the greenhouse at a formation depth of 10 cm and was able to improve this formation depth to a certain extent. The temperature at 30 cm and 50 cm plays a positive role in building a good vegetation growth environment.

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“…At the same time, China has become the country with the largest vegetable planting area in the world, while its output is only 1/3 of the developed countries in the world. This phenomenon is directly related to the low temperature [3] and high humidity [4] in the microclimate environment [5] of facility agriculture in winter.…”

Section: Introductionmentioning

confidence: 99%

Investigation of photo-thermal performance of compound parabolic concentrator system for soil heating in facility agriculture

et al. 2023

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Aiming at the large carbon emissions of facility agricultural heating in severe cold regions in winter, a Compound Parabolic Concentrator based soil heating system was presented. The system integrated with novel trough Compound Parabolic Concentrator and was used for soil heating in facility agriculture. Following the structure of the Compound Parabolic Concentrator, TracePro software was selected to trace the light in the Compound Parabolic Concentrator. And the variation trend of the light escape rate of the Compound Parabolic Concentrator with the different incident angles was analyzed. Based on the calculation results, the performance of the solar collector system was investigated, and the impact of circulating air velocity on the photothermal performance of the solar collector system was explored. Research results indicate that when the circulating air velocity is 1.4 m/s and the average ambient temperature is about 28.9 ?, the temperature of the system outlet is up to 90.9?C. And the average instantaneous heat collection, maximum photothermal conversion efficiency, and unit area heat collection of the system are 740.6 W, 27.83 % and 0.8 MJm-2, respectively. This research can effectively promote the efficient integration of the solar collector system in facility agriculture.

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New insights of designing thermal insulation and heat storage of Chinese solar greenhouse in high latitudes and cold regions

Cited by 44 publications

References 52 publications

Configuration Optimization of Temperature–Humidity Sensors Based on Weighted Hilbert–Schmidt Independence Criterion in Chinese Solar Greenhouses

Configuration Optimization of Temperature–Humidity Sensors Based on Weighted Hilbert–Schmidt Independence Criterion in Chinese Solar Greenhouses

Study on the Influence of Solar Array Tube on Thermal Environment of Greenhouse

Investigation of photo-thermal performance of compound parabolic concentrator system for soil heating in facility agriculture

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