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Sensitivity analysis of the DehumReq model to evaluate the impact of predominant factors on dehumidification requirement of greenhouses in cold regions

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Information Processing in Agriculture 2023年第2期10卷 216-228页

作者： Md Sazan Rahman huiqing guo Department of Mechanical Engineering University of Saskatchewan57 Campus driveSaskatoonSK S7N 5A9Canada Department of Bioresource Engineering McGill UniversityMacdonald Stewart Building21111 Lakeshore RoadSainte-Anne-de-BellevueQC H9X 3V9Canada

In this study,the sensitivity of a novel dehumidification requirement model(DehumReq)is analyzed to evaluate the effect of the predominant factors on the dehumidification needs of the *** hourly dehumidification demand and sensitivity coefficient(SC)are estimated for three different seasons:warm(July),mild(May),and cold(November),by using the local sensitivity analysis *** on SC values,the solar radiation,air exchange,leaf area index(LAI),and indoor setpoints(temperature,relative humidity(RH),and water vapor partial pressure(WVPP))have significant impact on the dehumidifi-cation needs,and the impact varies from season to *** parameters have a higher SC in summer,whereas solar radiation and LAI have a higher SC in mild *** dehumidification load increases 4 times of its base value with increasing solar radiation by 200 W/m^(2),and the highest LAI(10)caused 5 times increment of the *** changing of WVPP from its base value(1.5 kPa)to maximum(2.9 kPa)reduces the load 70%in *** exchange was found to be the most crucial parameter because it is the main dehumidification approach that has a large range and is easily adjustable for any *** air exchange by ventilation or infiltration will reduce the dehumidification load to zero in May and November and minimizes it to only nighttime load in *** the other parameters,higher ambient air RH and indoor air speed will result in higher the dehumidification load;whereas higher inner surface condensation will result in lower dehumidifi-cation *** result of this study will assist in the selection of the most efficient moisture control strategies and techniques for greenhouse humidity control.

关键词： Greenhouse Dehumidification DehumReq model Sensitivity analysis Solar radiation Air exchange

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Development of a method for condensation rate measurement on flat surfaces

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Information Processing in Agriculture 2018年第4期5卷 490-497页

作者： Jingjing Han huiqing guo Department of Chemical and Biological Engineering University of SaskatchewanS7N 5A9Canada Department of Mechanical Engineering University of SaskatchewanS7N 5A9Canada

Condensation on greenhouse interior surfaces plays an important role in reducing indoor air *** is no standard method to measure condensation rate in greenhouses or in any other *** this study,a commercially available leaf wetness sensor was calibrated in an environment chamber under different room temperature and RH conditions,which included five temperatures of 18,20,22,24,and 26℃,and five RH levels of 40,55,65,75,and 85%.The sensor surface temperature was maintained the same as the room *** temperature water was sprayed on the sensor surface,simulating *** voltage output of the sensor changed due to varying amounts of condensate on the sensor *** amount of condensate on the sensor surface was divided into five groups from 0 to 0.5 g(or 0-0.015 g per square centimeter of sensor surface area)with an interval of 0.1 *** statistical analysis showed that both sensor temperature and indoor RH had no significant effect on the sensor voltage *** voltage output was solely determined by the amount of condensate mass on the sensor surface.A linear regression model was developed between the voltage output and the amount of *** tool is considered as a breakthrough of technology for condensation rate measurement on greenhouse interiors surface,or on any other surfaces with *** can use this sensor and the development relationship for measuring condensation rate as the sensor is not pricy and the method is easy to use,thus the method should be widely used as a standard method.

关键词： Condensation sensor Leaf wetness sensor Greenhouse

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Comprehensive review of models and methods used for heat recovery from composting process

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International Journal of Agricultural and Biological Engineering 2017年第4期10卷 1-12页

作者： Zhao Rongfei Gao Wei guo huiqing College of Water Conservancy Shenyang Agricultural UniversityShenyang 110866China Department of Mechanical Engineering College of EngineeringUniversity of Saskatchewan57 Campus DriveSaskatoonSK S7N 5A9Canada College of Engineering Shenyang Agricultural UniversityShenyang 110866China

The large amount of heat produced from solid waste composting has stimulated great interest in heat recovery and *** paper reviews the advances in composting heat recovery researches in the last *** experimental results and theoretical studies on composting heat utilization are *** results indicate a great potential for utilization of heat produced by the composting *** problems experienced by current methods are how to realize the maximum heat recovery without negatively impacting compost quality and the economics of heat recovery *** advancement of these methods is currently receiving comprehensive interests,both academically and commercially.

关键词： composting heat recovery model and method heat utilization solid waste

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A quasi-steady state model for predicting the heating requirements of conventional greenhouses in cold regions

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Information Processing in Agriculture 2018年第1期5卷 33-46页

作者： Md Shamim Ahamed huiqing guo Karen Tanino Division of Environmental Engineering University of SaskatchewanCanada Department of Mechanical Engineering University of SaskatchewanCanada Department of Plant Sciences University of SaskatchewanCanada

A time-dependent,quasi-steady state thermal model(GREENHEAT)based on the lumped estimation of heat transfer parameters of greenhouses has been developed to predict the hourly heating requirements of conventional *** model was designed to predict the hourly heating requirements based on the input of greenhouse indoor environmental control parameters,physical and thermal properties of crops and construction materials,and hourly weather data including temperature,relative humidity,wind speed,and cloud *** model includes all of the heat transfer parameters in greenhouses including the heat loss for plant evapotranspiration,and the heat gain from environmental control *** show that the predicted solar radiation data from the solar radiation sub-model are a reasonable fit with the data from the National Solar Radiation Database(NSRDB).Thermal analysis indicates environmental control systems could reduce 13–56%of the total heating requirements over the course of a year in the study *** the winter season,the highest amount of greenhouse heat is lost due to conduction and convection,and the heat used for evapotranspiration is dominant in the ***,the model was validated with actual heating data collected from a commercial greenhouse located in Saskatoon,and the results show that the model satisfactorily predicts the greenhouse heating requirements.

关键词： Heating model Solar radiation Supplemental lighting Evapotranspiration

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Heating demand and economic feasibility analysis for year-round vegetable production in Canadian Prairies greenhouses

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Information Processing in Agriculture 2019年第1期6卷 81-90页

作者： Md Shamim Ahamed huiqing guo Lisa Taylor Karen Tanino Department of Farm Power and Machinery Bangladesh Agricultural UniversityBangladesh Department of Mechanical Engineering University of SaskatchewanCanada Department of Plant Sciences University of SaskatchewanCanada

Greenhouse vegetable production in Canadian Prairies is important for creating a sustainable regional food economy,especially in northern *** study included the estimation of heating demand for year-round production and evaluation of the economic feasibility of greenhouse vegetable production(tomato,cucumber,and pepper)in a conceptually designed greenhouse(0.6 ha)located in remote northern communities in Saskatchewan,*** heating simulation was based on a greenhouse heating simulation model(GREENHEAT)developed by the authors *** simulation results showed that the annual heating requirement for the production of tomato,cucumber,and pepper are 1486 MJ m^2,1657 MJ m^2,and 1754 MJ m^2,*** economic analysis indicates the net return(NR)from the production of tomato,cucumber,and pepper,are C$69.2/m^2(in Canadian dollar,CAD),C$41.5/m^2,and C$43.8/m^2,respectively,based on the market price C$3.5/kg,C$2.7/kg,and C$8.0/kg,and yields of 55.0 kg m^-2,65.0 kg m^-2,and 23.0 kg m^-*** net present value(NPV)for the tomato,cucumber,and pepper production are C$1.9 M,C$1.2 M,and C$1.1 M,respectively,and the benefit-cost ratio(BCR)are 1.38,1.21,and *** economic feasibility analysis indicates the year-round production of vegetables in a greenhouse at remote northern Saskatchewan would be economically profitable.

关键词： Northern latitudes Heating requirement Economic analysis Sensitivity analysis Year-round production

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NUMERICAL SIMULATION FOR A PROCESS ANALYSIS OF A COKE OVEN

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China Particuology 2005年第6期3卷 373-378页

作者： Zhancheng guo huiqing Tang Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 P.R. China

A computational fluid dynamic model is established for a coking process analysis of a coke oven using PHOENICS CFD package. The model simultaneously calculates the transient composition, temperatures of the gas and the solid phases, velocity of the gas phase and porosity and density of the semi-coke phase. Numerical simulation is illustrated in predicting the evolution of volatile gases, gas flow paths, profiles of density, porosity of the coke oven charge, profiles of temperatures of the coke oven gas and the semi-coke bed. On the basis of above modeling, the flow of coke oven gas （COG） blown from the bottom of the coke oven into the porous semi-coke bed is simulated to reveal whether or not and when the blown COG can uniformly flow through the porous semi-coke bed for the purpose of desulfurizing the semi-coke by recycling the COG. The simulation results show that the blown COG can uniformly flow through the semi-coke bed only after the temDerature at the center of the semi-coke bed has risen to above 900℃.

关键词： coal carbonization flow in porous media desulfurization of coke

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Study on Identification of Salmonella in Textiles with LAMP-MALDI TOF MS

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口岸卫生控制 2019年第4期24卷 17-26页

作者： Li Ke guo huiqing Wang Yongliang Zhengzhou Customs Technology Center

Objectives To establish a rapid analytical procedure for salmonella in textiles by LAMP in combination with MALDI TOF MS. The gene sequence invA of salmonella is specific to pathogenic strains. Based on its characteristic,a set of LAMP primer for salmonella is designed. If the amplification result is suspicious or positive,the strains are separated and the determination is rapidly performed through MALDI TOF MS technique. Methods About 70 reference strains closely related to the textiles and public health are selected to perform the specificity study(Salmonella enterica,Salmonella tyhimurium,Salmonella choleraesuis,Salmonella paratyphi A etc.);The bacterium solution of salmonella is diluted to different gradients for the sensitivity study. Results The results show this method is appropriately specific and sensitive,the limit of detection up to 4.6 CFU/mL. Conclusions The procedure is a new technique to detect salmonella in textiles.

关键词： Salmonella InvA Gene LAMP MALDI TOF MS

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Tiger, Tiger Burning Bright

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China Today 2008年第6期57卷 42-43页

作者： GE GUANGZHI, DONG YANPING & guo huiqing

IT is no big news that a farm-ing community sometimes pro-duces an artist or two. But when there are hundreds, that

关键词：老虎河南文化传统艺术作品

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散发型视网膜色素变性致病基因及其遗传方式观察

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中华眼底病杂志 2016年第6期32卷 576-581页

作者：郭慧青盛迅伦宁夏人民医院宁夏眼科医院银川750004

目的观察宁夏地区散发型视网膜色素变性（RP）的致病基因及其遗传方式.方法临床检查确诊为散发型RP（sRP）的患者49例以及家庭成员128名纳入研究.详细收集患者病史、家族史;患者以及家庭成员均行最佳矫正视力、裂隙灯显微镜、间接检... 详细信息

目的观察宁夏地区散发型视网膜色素变性（RP）的致病基因及其遗传方式.方法临床检查确诊为散发型RP（sRP）的患者49例以及家庭成员128名纳入研究.详细收集患者病史、家族史;患者以及家庭成员均行最佳矫正视力、裂隙灯显微镜、间接检眼镜、眼底彩色照相、视野、光相干断层扫描、全视野视网膜电图检查;采集患者及其家庭成员外周静脉血,提取全基因组DNA.采用外显子捕获技术对目前已知的230个视网膜疾病致病基因进行相关基因排查,确定候选致病基因突变位点;第二代测序技术直接测序法进行验证,并在家庭成员中进行共分离,分析其遗传方式.结果 49例sRP患者中,24例患者检测出致病基因16个,检测阳性率为49.0％;发现突变位点41个.其中,新发现突变位点32个,占78.0％.24例检测出致病基因的患者中,致病基因USH2A 7例,占29.2％;C20rf71、RDH12、CNGA1各2例,分别占8.3％;RPGR1、IFT140、TULP1、CLRN1、RPE65、ABCA4、GUCA1A、EYS、CYP4V2、GPR98、ATXN7各1例,分别占4.2％.根据其家庭成员基因筛查结果分析,24例检测出致病基因的患者中,隐性遗传RP20例,占83.3％;显性遗传RP 3例,占12.5％;X连锁遗传RP 1例,占4.2％.USH2A基因突变的7例患者中3例确诊为Usher综合征.结论宁厦地区sRP患者主要致病基因为USH2A基因;检测出致病基因的患者中83.3％为常染色体隐性遗传RP.

关键词：色素性视网膜炎/遗传学遗传方式基因突变高通量核苷酸序列分析

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重交通干道钢桥桥面沥青混凝土性能的研究

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土木工程学报 1994年第1期27卷 67-74页

作者：黄彭任惠清郭青筠同济大学

本文针对钢桥桥面在行车荷载和温度综合作用下的应力应变特征,提出了一种EVA改性沥青结合料,改善了重交道道路沥青的低温可变形能力和高温稳定性能.通过对沥青混凝土混合料的马歇尔稳定度、低温抗弯拉强度、高温蠕变性能、重复疲劳强度... 详细信息

本文针对钢桥桥面在行车荷载和温度综合作用下的应力应变特征,提出了一种EVA改性沥青结合料,改善了重交道道路沥青的低温可变形能力和高温稳定性能.通过对沥青混凝土混合料的马歇尔稳定度、低温抗弯拉强度、高温蠕变性能、重复疲劳强度和动载、静载作用下的粘结强度等专项试验,综合论证和评叙了这种复合改性沥青混凝土的路用性能.并且已应用到主要道路干线的钢桥面层结构中,呈现出良好的使用状态.

关键词：钢桥桥面沥青混凝土干道

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