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Performance Analysis of Compound Parabolic Concentration Photothermal and Photoelectricity Device for Soil Heating in facility agriculture

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Transactions of Tianjin University 2022年第2期28卷 144-152页

作者： Zehui Chang Yanan Peng Xuedong Liu Jing Hou Shuaijun Guo College of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot 010051China Solar Energy Application Technology Engineering Center Inner Mongolia University of TechnologyHohhot 010051China College of Mechanical Electrical Heating and Ventilation Engine Inner Mongolia Technical College of ConstructionHohhot 010070China

It is difficult for solanum crops to grow continuously during winter in severe cold regions. Thus, a soil heating system for facility agriculture based on solar concentration technology was proposed, and a novel compound parabolic concentration photothermal and photoelectricity device(CTPV) equipped in the system was designed to address this problem. In accordance with the structure of the device, LightTools optical software was selected to analyze the variation trend of the light escape rate of the device with the diff erent incident angles. On the basis of the calculation results, an experimental test system was used to investigate the relationship of the air temperature of the inlet and the outlet, total output power of the solar cells, and photothermal and photoelectricity efficiency of the device with the operation time during a sunny day. Research results reveal that the light escape rate of the device is 5.36% at an incidence angle of 12°. At a velocity of 1.5 m/s, the maximum air temperature of the outlet can reach 55.6 ℃, and the total output power of the solar cells is 474.4 W. The variation of the total power of the solar cells is consistent with the simulation results. The maximum instantaneous heat collection and the maximum photothermal and photoelectricity efficiency of the device are 306 W and 60.4%, respectively, and the average efficiency is 44.9%. This study can serve as a reference for compound parabolic concentration technology applied for soil heating in facility agricultural soil heating systems.

关键词： facility agriculture Photothermal and photoelectricity Concentration Soil Heating

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Analysis on the Impact of facility agriculture Development on Climate Change in Weifang

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Meteorological and Environmental Research 2011年第6期2卷 55-60页

作者： XIAO Qing-hua LI Shu-jun CUI Jian-yun YUAN Jing Weifang Meteorological Bureau of Shandong Province Weifang 261011China

[Objective] The research aimed to study the influence of facility agriculture development on the climate variation in Weifang. [Method] Shouguang was selected as the representative station of greenhouse shed planting zone. By using the precipitation, temperature and relative humidity, etc. in Weifang City during 1961-2010, the climatic variation situations in the whole city and the greenhouse shed planting zone were analyzed. The variation trend and evolution characteristics of climate in the different seasons before and after the facility agriculture plantation were contrasted and analyzed. [Result] The annual rainfall and relative humidity presented the declining trend in the whole city in recent 50 years. The annual average, maximum and minimum temperatures all presented the rising trend. Since the large-scale plantation of greenhouse shed, the declining range of annual rainfall in the greenhouse shed planting zone was lower than that in the whole city, and the declining range of relative humidity was obviously higher than that in the whole city. The rising ranges of annual average, maximum and minimum temperatures were higher than that in the whole city. [Conclusion] The research provided the theory basis for the development of facility agriculture.

关键词： facility agriculture Climate change Impact analysis China

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Analysis on Impact of facility agriculture on Ecological Function of Modern agriculture

Analysis on Impact of Facility Agriculture on Ecological Fun...

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2011 3rd International Conference on Environmental Science and Information Application Technology(ESIAT 2011)

作者： Li Guangyong Li Xiaoyan Jiang Cuihong Lv Guohua College of Resources Science and Technology Beijing Normal University Institute of Integrated Development of agriculture Beijing Academy of Agricultural and Forestry Sciences Institute of Environment and Sustainable Development of agriculture The Chinese Academy of Agricultural Sciences

facility agriculture is an important mode of development in modern agriculture, and it played a key role in improving the ecological function. Based on the descriptions on ecological function of modern agriculture, a number of ecological and environmental problems caused by large-scale facility agriculture were analyzed in this paper. Agricultural facilities tent membrane change surface coverage types of facilities agriculture area, will cause changes in the rate of surface occurs and break the original surface energy balance. Facilities agriculture covered by insulation in the night will prevent the surface heat from diffusing and reduce the absorption of long-wave radiation. The covered tent membrane barriered vapour from exchanging and reduce total plant evapotranspiration. The change of environments inside of the agricultural facilities will influence the balance of the soil respiration. The unreasonable cultivation practices will destroy regional soil *** environmental problems will weaken the urban ecological conservation in modern agriculture. Accordingly, we put forward corresponding countermeasures and Suggestions.

关键词： modern agriculture facility agriculture ecological function weakening measures

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Overview of the Development of facility agriculture

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Agricultural Biotechnology 2020年第4期9卷 151-154页

作者： Yuyi HUANG Guifen CHEN Yanfei HUANG Bin LIU Liumei XIONG Guiyun GAN Liping XIE Agricultural Resource and Environmental Science Research Institute Guangxi Academy of Agricultural SciencesNanning 530007China Vegetable Research Institute Guangxi Academy of Agricultural SciencesNanning 530007China Agro-products Quality Safety and Testing Technology Research Institute Guangxi Academy of Agricultural SciencesNanning 530007China

This paper reviewed the meaning of facility agriculture and the development status and trends of facility agriculture at home and abroad,analyzed the development status and existing problems of facility agriculture in Guangxi,and proposed corresponding solutions to the problems in the development of facility agriculture in Guangxi,aiming to provide reference for promoting the sustainable development of facility agriculture in Guangxi.

关键词： Guangxi facility agriculture Problems Countermeasures

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Investigating the Effects of Greenhouse Vegetable Cultivation on Soil Fertility in Lhasa, Tibetan Plateau

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Chinese Geographical Science 2020年第3期30卷 456-465页

作者： WANG Zhaofeng GONG Dianqing ZHANG Yili Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing100049China Chinese Acad-emy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China

The area of land utilized for growing vegetables in greenhouses has expanded rapidly on the Tibetan Plateau over recent decades. However, the effects of greenhouses on soil fertility as well as variations in these effects between the plateau and plain remain unclear on the Tibetan Plateau. This study assessed the effects of vegetable greenhouses in the vicinity of Lhasa, using open field soil as a control. A total of 92 plough layer(0-20 cm depth) soil samples including 54 from greenhouses and 38 from open fields were taken, and soil pH, electrical conductivity(EC), total soluble salt(TS), soil organic matter(SOM), total nitrogen(TN), available phosphorus(AP), and available potassium(AK) were measured. The results reveal that, soil pH was lower 1.0 units in greenhouses than that in open field. TS was higher 82% and AP was higher 160% overall. Similarly, SOM and TN were higher 32% and 46%, respectively, while AK changed slightly at a higher 1% rate. Results also show that soil properties varied depending on cultivation time and vegetable types. Overall, pH continuously decreased with cultivation time while other soil fertility indicators reached a maximum value after nine years of cultivation before starting to decrease. The effect of leafy vegetable planting on soil was slight overall, while the impact of fruits on soil was more serious. Compared with changes in plain greenhouse soil fertility measured across the eastern China, the effects of greenhouses on soil in Lhasa remain relatively limited;and the change in the degree of soil fertility was lower and the extreme values of soil fertility occurred later in Lhasa.

关键词： facility agriculture soil nutrient imbalance soil environment Lhasa Tibetan Plateau

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Current Situation and Development Proposals of Agricultural Facilities(Planting)Application in Beijing

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Journal of Beijing Institute of Technology 2023年第3期32卷 275-284页

作者： Xihong Lei Wei Li Yanfang Wang Manli Niu Fudong Wang Dong An Liguo Yang Beijing Agricultural Technology Extension Station Beijing 100029China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China

facility agriculture is an essential carrier for promoting stable production and ***2020,the planting area of facility agriculture in Beijing(290098000 m2)accounted for 29.06%of the total planting area of crops(998078000 m2),and the output value accounted for 46.56%.In2022,Beijing Agricultural Technology Extension Station organized relevant departments to summarize and evaluate the agricultural facilities in Beijing through consultation materials,interviews,questionnaires,and field trips,combining survey data and statistical data to draw the following *** play a major supporting role in stabilizing production and ensuring *** number of traditional greenhouses is extensive and covers a large area,so special planning and classification upgrades are urgently *** are rich in scientific and technological resources,but the mode of production is out of *** is of great significance to improve the comprehensive production capacity of facility agriculture and promote the healthy and stable development of facility industry in Beijing to increase the utilization rate of facility agriculture land,strengthen the support of facility science and technology,and cultivate the socialized service organization of facility.

关键词： facility agriculture stable production and supply cost benefit technical support

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Variations of soil quality from continuously planting greenhouses in North China

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International Journal of Agricultural and Biological Engineering 2019年第1期12卷 139-145页

作者： Jing Li Yan Xu Hongguang Liu Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production&Construction GroupCollege of Water Conservancy&Architectural EngineeringShihezi UniversityXinjiang 832000China

Vegetable greenhouses form a significant land utilisation pattern in China.A case study of the greenhouse soil quality changes and potential risk to humans under a specific long-term environment,which includes high fertilization rates,high temperatures and humidity levels and out-of-season cultivation,is presented in this *** profiles of 72 representative solar greenhouses with various planting years were sampled in Shouguang City,which is the birthplace of winter greenhouse in *** temporal distribution of soil quality changes were quantitatively evaluated through the application of a correlation analysis and soil quality *** soil was highly enriched with phosphorus and potassium and had low organic matter *** organic matter,nitrogen,phosphorus and potassium contents increased with the years planted,reached their peak values after 5-10 a,and declined as the soil layer’s depth *** infiltration rate of nitrate was relatively high,which poses risks to underground water safety.A comprehensive soil quality assessment revealed that in vegetable greenhouses planted for different periods,the soil quality improved at first and then sharply declined after 10 *** greenhouse soil quality changes will aid in implementing nutrient management strategies to improve the soil quality and sustainable development programs for the vegetable industry.

关键词： vegetable greenhouse facility agriculture planting years soil quality microbial activity

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Design and experiment of a barrel-shaped aeroponic cultivation system

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International Journal of Agricultural and Biological Engineering 2022年第32期15卷 90-94页

作者： Shouhe Qi Yunfei Ma Mei Zhang Baoquan Yin Zhenyan Xu Shuguang Liu Yantai Institute China Agricultural UniversityYantai 264670ShandongChina Shandong Aiwei Agricultural Technology Co. Ltd.Yantai 264111ShandongChina

Theoretically,aeroponic cultivation is easy to make plant roots in a better growth *** order to give better play to the theoretical advantages of aeroponic cultivation,further optimize the structure of the aeroponic cultivation system,and make the aeroponic cultivation system more scientific and reasonable,a barrel-shaped aeroponic cultivation system is *** aeroponic cultivation system is composed of a monitoring and control system,power equipment,nutrient solution storage,and treatment facility,nutrient solution supply pipelines,aeroponic cultivation barrels,and nutrient solution return *** cultivation system working principle and its technical requirements were analyzed,and its structure for meeting the requirements of large-scale production was determined.A performance test of the barrel-shaped aeroponic cultivation system using cultivated narrow leaved Chinese chives was *** Chinese chives were cultivated to 6 beds of the cultivation *** system supplied nutrient solution every 30 min for 2 min each *** 5 weeks growth,the length,leaf width,and single weight of Chinese chive ranged from 293-362 mm,4.1-6.7 mm,and 3.48-5.47 g,respectively,the average length,leaf width,and single weight of Chinese chive were 327 mm,5.1 mm,and 4.24 g,respectively,and there were no significant differences in the length,leaf width,and single weight of Chinese chive on 6 beds by One-way *** test results showed that all the Chinese chive in each bed of the cultivation barrel grew well and uniform,which indicated that the circulation process of nutrient solution supply and return in the system was normal,the process of nutrient solution atomization in the system was uniform,and the aeroponic cultivation system operated normally and stable and could be applied in production.

关键词： aeroponic cultivation soilless cultivation facility agriculture Chinese chive

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Application Study of Greenhouse Environment Monitoring System Based on ZigBee Technology

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Asian Agricultural Research 2017年第2期9卷 39-43,71页

作者： Weiting ZHANG Hongye YANG Wentao FENG Rui WANG Inner Mongolia University of Technology Inner Mongolia Heqing Technology Co. Ltd.

Against the demand of intelligent greenhouse construction of facility agriculture,greenhouse environment monitoring system is *** system contains three-layer architecture: sensor network layer at the bottom,data transmission convergence layer in the middle and monitoring application layer on the top,which is different from design idea of the existing system *** bottom layer uses ZigBee wireless communication technology to construct wireless sensor network,and node type contains coordinator,router and acquisition *** terminal is distributed in each greenhouse to collect data and play the role of wireless transmission,and router plays the function of data forwarding as the bridge of acquisition terminal and *** layer is composed of monitoring software developed by Lab VIEW software of NI Company and coordinator,which is used to gather data from the bottom *** top layer is comprehensive monitoring platform developed by Java language,which is used to gather greenhouse data of all plantation bases in one region,thereby providing comprehensive information service for government,enterprise and *** environment monitoring system realizes data collection and sharing of greenhouse environment information(air temperature,air humidity,light intensity and carbon dioxide concentration).Via test verification,the system's operation is stable,with certain application value.

关键词： facility agriculture Intelligence System architecture Wireless sensor network

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Study on Neural Network Modeling of Greenhouse Environment Based on Partial Least Squares Algorithm

Study on Neural Network Modeling of Greenhouse Environment B...

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2010 International Conference on Computer and Communication Technologies in agriculture Engineering (CCTAE 2010)

作者： Bin Zhao1 2 1)College of Electromechanical Engineering Northeast Forestry University Harbin Heilongjiang Province China Keqi Wang1 2) College of Information Technology Heilongjiang Bayi Agricultural University Daqing Heilongjiang Province China

The greenhouse environment model is an important basis to make control strategies and optimize control method. If correlation among multi-variables of greenhouse environmental model exists, the accuracy of the model decreases. In this paper, utilize partial least squares （PLS） to extract principal components of data, adopt radial basis function neural network （RBFNN） to construct control model of greenhouse environment in northern region of china. And this model is compared with the Orthogonal Least Square （OLS） algorithm in performance. The results indicate that RBF network model of the greenhouse environment based on PLS has smaller network structure, and is superior to OLS algorithm in the approximation ability and generalization ability. The model has laid a good foundation for designing control scheme and structure of greenhouse environment.

关键词： facility agriculture greenhouse environment model PLS

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