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Journal of Thermal Science 2018年第3期27卷 230-240页

作者： TAN Yingying chen youming WANG Lin School of Civil Engineering Hunan University Institute of Refrigeration and Air-Conditioning Henan University of Science and Technology

A mixed refrigerant ejector refrigeration cycle operating with two-stage vapor-liquid separators （MRERC2） is proposed to obtain refrigeration temperature at -40℃. The thermodynamic investigations on per- formance of MRERC2 using zeotropic mixture refrigerant R23/R134a are performed, and the comparisons of cycle performance between MRERC2 and MRERC1 CMRERC with one-stage vapor-liquid separator） are conducted. The results show that MRERC2 can achieve refrigeration temperature varying between -23.9℃ and -42.0℃ when ejector pressure ratio ranges from 1.6 to 2.3 at the generation temperature of 57.3-84.9℃. The parametric analysis indicates that increasing condensing temperature decreases coefficient of performance （COP） of MRERC2, and increasing ejector pressure ratio and mass fraction of the low boiling point component in the mixed refrigerant can improve COP of MRERC2. The MRERC2 shows its potential in utilizing low grade thermal energy as driving power to obtain low refrigeration temperature for the ejector refrigeration cycle.

关键词： Ejector Refrigeration Zeotropic Refrigerant Vapor-liquid Separator Refrigeration Temperature

Effects of structural and operating parameters of ECP fan on dust particles removed in the transition flow regime

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International Journal of Coal Science & Technology 2014年第4期1卷 441-449页

作者： Shiqiang chen youming chen Haiqiao Wang Ronghua Liu Haijiao Cui College of Civil Engineering Hunan UniversityChangsha 410082China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&Technology(Beijing)Beijing 100083China Hunan Province Engineering Research Center of Mine Ventilation and Dust Removal Equipment Hunan University of Science and TechnologyXiangtan 411201China

An enclosed cyclone passageway(ECP)dust-collecting fan is *** ECP fan separates dust by centrifugal force originating from a driven spiral airflow,and its design takes the constraints of Chinese underground coal mines into *** the force equilibrium law,a general equation for dust removal in the centrifugal dust removal section(CDRS)of the ECP fan is *** general equation is simplified using the CDRS structure and the fan operating parameters and is analysed *** attractive results show that increases in the airflow rate of the fan,the structural ratio of the ECPs and the radius of the extended axis can improve the dust removal performance of the ***,the effects of the structural ratio and the radius on dust removal dominate over that of the flow rate,and the effect of the structural ratio is more significant than that of the radius.

关键词： Dust removal Driven spiral airflow Structural and operating parameters ECP fan

Study on the impact of window shades’physical characteristics and opening modes on air conditioning energy consumption in China

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Energy and Built Environment 2020年第3期1卷 254-261页

作者： Yutong Tan Jinqing Peng Charlie Curcija Rongxin Yin Lu Deng youming chen College of Civil Engineering Hunan UniversityChangshaHunanChina Key Laboratory of Buildings Safety and Energy Efficiency of the Ministry of Education ChangshaHunanChina Building Technology and Urban Systems Division Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA Energy Storage and Distributed Resources Division Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA

This paper focused on the impact of window shades’physical characteristics and opening modes on annual air conditioning energy consumption of residential buildings in *** building models with different window layouts were proposed initially,and then validated by the dimensionless indicator annual energy performance(AEP)to determine the final building model adopted in this ***,Beijing,Guangzhou,Changsha and Kunming were selected to represent five different climate zones in *** shading model has taken six physical characteristics of window shades,*** emissivity,inner emissivity,solar transmittance,solar reflectance,thermal infrared transmittance,conductivity and two opening modes,***&down mode as well as left&right mode,into ***,the window shades operation schedule was summarized through 949 valid *** annual air conditioning energy consumption was calculated via EnergyPlus software,and then the impact of the above different opening modes and parameters on energy use were *** analysis results indicated that the top&bottom opening mode is better than the left&right mode when used in Harbin,and the effect of two different modes in air conditioning energy consumption in Kunming is *** in the other three cities,the left and right mode is ***,the analysis results of the impact of different physical characteristics on air conditioning energy use in different climate zones could help improve the energy performance of window shades.

关键词： Window shades Optical and thermal characteristics Opening modes Human behavior Energy consumption

A novel nomogram based on routine clinical indicators for screening for Wilson's disease

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Liver Research 2023年第1期7卷 82-89页

作者： Jiahui Pang Shuru chen Weiqiang Gan Guofang Tang Yusheng Jie Zhanyi Li Yutian Chong youming chen Jiao Gong Xinhua Li Yongyu Mei Department of Infectious Diseases The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Guangzhou Eighth People's Hospital Guangzhou Medical UniversityGuangzhouGuangdongChina Department of Laboratory Medicine The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Department of Infectious Diseases National Regional Medical Center for Infectious DiseasesKashgar Hospital Affiliated to Sun Yat-sen UniversityKashgarXinjiangChina

Background and aims:There is currently no single model for predicting Wilson's disease(WD).We aimed to create a nomogram using daily clinical parameters to improve the accuracy of WD diagnosis in patients with abnormal liver ***:Between July 2016 and December 2020,we identified 90 WD patients with abnormal liver function who had homozygous or compound heterozygous mutations in the ATP7B *** control group included 128 patients with similar liver function but no WD during the same time *** create a nomogram,we screened potential predictive variables using the least absolute shrinkage and selection operator model and multivariate logistic ***:We developed a nomogram for screening for WD based on six predictive factors:serum copper,direct bilirubin,uric acid,cholinesterase,prealbumin,and reticulocyte *** the training cohort,the area under curve(AUC)of the nomogram reached 0.967(95%confidence interval(CI)0.946e0.988),while the area under the precision-recall curve was *** on the optimal cutpoint of 213.55,our nomogram performed well,with a sensitivity of 96%and a specificity of 87%.In the validation cohort,the AUC of the nomogram was as high as 0.991(95%CI 0.970e1.000).Conclusions:We developed a nomogram that can predict the risk of WD prior to the detection of serum ceruloplasmin or urinary copper,greatly increasing screening efficiency for patients with abnormal liver function.

关键词： Wilson's disease(WD) Diagnosis Nomogram Probabilistic model Predictor

Long-term hepatitis B surface antigen kinetics after nucleos(t)ide analog discontinuation in patients with noncirrhotic chronic hepatitis B

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Liver Research 2024年第3期8卷 179-187页

作者： Lina Wu Jiadi Lai Qiumin Luo Yeqiong Zhang Chaoshuang Lin Dongying Xie youming chen Hong Deng Zhiliang Gao Liang Peng Wenxiong Xu Department of Infectious Diseases The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Guangdong Key Laboratory of Liver Disease Research The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdongChina Key Laboratory of Tropical Disease Control Ministry of EducationSun Yat-sen UniversityGuangzhouGuangdongChina

Background and aim Few studies have reported hepatitis B surface antigen(HBsAg)kinetics after nucleos(t)ide analog(NA)discontinuation in patients with noncirrhotic chronic hepatitis B(CHB).The study specifically investigated long-term HBsAg kinetics after NA *** Between January 2014 to January 2024,this study prospectively enrolled 106 outpatients with noncirrhotic CHB who met the discontinuation criteria after NA consolidation ***,clinical,and laboratory data were collected and analyzed after NA *** Ninety-six patients who finished 5 years of follow-up were *** remained undetectable in 29 patients with end of treatment(EOT)HBsAg *** 67 patients with EOT HBsAg positivity,HBsAg seroclearance occurred in 12(17.9%)patients with an estimated annual incidence of HBsAg seroclearance of 3.6%.Patients with EOT HBsAg levels of≤1000 IU/mL had a higher HBsAg seroclearance rate than those with EOT HBsAg levels of>1000 IU/mL(33.3%vs.5.4%).The proportion of patients with HBsAg≤1000 IU/mL increased during *** regression analysis indicated that the EOT HBsAg level was an independent factor for HBsAg seroclearance and an HBsAg level decline exceeding 1 log10 IU/*** optimal EOT HBsAg cutoff for both HBsAg seroclearance and an HBsAg level decline exceeding 1 log10 IU/mL was 359 IU/*** Patients with EOT HBsAg negativity experienced no relapse and maintained HBsAg seroclearance during 5 years of follow-up after NA discontinuation.A higher HBsAg seroclearance rate can be obtained in patients with EOT HBsAg levels of≤1000 IU/mL during 5 years of follow-up after NA *** monitoring and proper NA retreatment are recommended to guarantee the safety of NA discontinuation.

关键词： Hepatitis B virus(HBV) Chronic hepatitis B(CHB) Hepatitis B surface antigen(HBsAg) Nucleos(t)ide analogs(NAs) Quantitative HBsAg Kinetics

Effect of early correction of anemia with erythropoietin on left ventricular mass in predialysis patients:a multi-center trial

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Journal of Geriatric Cardiology 2005年第3期2卷 136-139页

作者： Fanfan HOU Jianping JIANG Lizhen GAO Yangbin PAN Niansheng YANG Wei chen Guiyang SHU youming chen Jian chen Weihua PENG Jianping WU Zhongmin YANG Division of Nephrology Nanfang HospitalGuanzhou 510515China

Objective To assess the effects of early correction of anemia with recombinant human erythropoietin(rHuEPO)on the development and progression of left ventricular hypertrophy(LVH)in patients with mild-to-moderate chronic renal insufficiency(CRI)who are not on *** A total of 158 patients with serum creatinine from 147μmol/L to 400μmol/L were nrolled in this prospective,multicenter ***-six patients with hemoglobin(Hb)<110g/L received rHuEPO treatment with a target Hb of≥110g/L(Group A).Forty patients with comparable Hb concentration(<110g/L)but did not receive rHuEPO(Group B)and 32 patients with Hb≥110g/L and without rHuEPO treatment(Group C)were served as *** ventricular mass index(LVMI)was evaluated by echocardiography at baseline and every 3 months for 2 *** There was no difference in age,gender,etiology of renal failure,blood pressure and cardiovascular risk factors among the 3 *** baseline,the prevalence of LVH was 72.1%in group A,72.5%in group B and 59.4%in group *** was inversely correlated with Hb levels(r=0.70,P<0.01).During the 2-year period,the mean LVMI decreased from 142.6±25.7g/m^(2)to 132.4±18.5 g/m^(2)in group A,while increased significantly in both group B and group *** mean Hb concentration increased from 93.8±14.6g/L to 111.2±10.3g/L(P<0.05)in group A,but tended to decrease in group B and group *** was no significant change of the mean blood pressure,number of anti-hypertensive drugs and serum creatinine concentrations in all 3 ***,patients'serum creatinine doubled more often in group B and group C than in group *** LVH was common in predialysis CRI patients and was associated with the severity of *** intervention with rHuEPO may reverse LVH in these patients.

关键词： renal failure chronic anemia left ventricular hypertrophy erythropoietin

DeST 3.0:A new-generation building performance simulation platform

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Building Simulation 2022年第11期15卷 1849-1868页

作者： Da Yan Xin Zhou Jingjing An Xuyuan Kang Fan Bu youming chen Yiqun Pan Yan Gao Qunli Zhang Hui Zhou Kuining Qiu Jing Liu Yan Liu Honglian Li Lei Zhang Hong Dong Lixin Sun Song Pan Xiang Zhou Zhe Tian Wenjie Zhang Ruhong Wu Hongsan Sun Yu Huang Xiaohong Su Yongwei Zhang Rui Shen Diankun chen Guangyuan Wei Yixing chen Jinqing Peng Building Energy Research Center School of ArchitectureTsinghua UniversityBeijing 100084China School of Architecture Southeast UniversityNanjingJiangsu 210096China School of Environment and Energy Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Civil Engineering Hunan UniversityChangshaHunan 410082China School of Mechanical Engineering Tongji UniversityShanghai200092China Beijing Key Lab of Heating Gas SupplyVentilating and Air Conditioning EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China China State Construction Technology Center Beijing 101320China School of Architecture Harbin Institute of TechnologyHarbinHeilongjiang 150090China School of Architecture Xi'an University of Architecture and TechnologyXi'anShaanxi 710055China School of Architecture South China University of TechnologyGuangzhouGuangdong 510641China Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing 100124China Key Lab of Built Environment and Energy of Tianjin School of Environmental Science and EngineeringTianjin UniversityTianjin 300350China School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Faculty of Computing Harbin Institute of TechnologyHarbinHeilongjiang 150001China Beijing Glory PKPM Technology Co. Ltd.Beijing 100013China Beijing Tangent Software Co. LtdBeijing 100081China Shanghai Huadianyuan Information Technology Co. LtdShanghai200092China Luoyang Hongye Information Technology Co. Ltd.LuoyangHenan 471822China

Buildings contribute to almost 30%of total energy consumption *** building energy modeling programs is of great significance for lifecycle building performance assessment and *** in novel building technologies,the requirements of high-performance computation,and the demands for multi-objective models have brought new challenges for building energy modeling software and *** meet the increasing simulation demands,DeST 3.0,a new-generation building performance simulation platform,was developed and *** structure of DeST 3.0 incorporates four simulation engines,including building analysis and simulation(BAS)engine,HVAC system engine,combined plant simulation(CPS)engine,and energy system(ES)engine,connected by air loop and water loop balancing *** 3.0 offers numerous new simulation features,such as advanced simulation modules for building envelopes,occupant behavior and energy systems,cross-platform and compatible simulation kernel,FMI/FMU-based co-simulation functionalities,and high-performance parallel simulation *** 3.0 has been thoroughly evaluated and validated using code verification,inter-program comparison,and case-study *** 3.0 has been applied in various aspects throughout the building lifecycle,supporting building design,operation,retrofit analysis,code appliance,technology adaptability evaluation as well as research and *** new generation building simulation platform DeST 3.0 provides an efficient tool and comprehensive simulation platform for lifecycle building performance analysis and optimization.

关键词： DeST building performance simulation building energy modeling

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空调冷负荷计算方法的发展现状与挑战

暖通空调 2017年第3期47卷 1-7,47页

作者：陈友明湖南大学

回顾了国内外空调冷负荷计算方法的发展历史并总结了发展现状,介绍了2种先进的冷负荷计算方法——热平衡方法和辐射时间序列方法;综述了负荷计算软件和建筑能耗模拟软件的现状。指出了新的空调系统形式和运行模式的出现改变了室内得热... 详细信息

回顾了国内外空调冷负荷计算方法的发展历史并总结了发展现状,介绍了2种先进的冷负荷计算方法——热平衡方法和辐射时间序列方法;综述了负荷计算软件和建筑能耗模拟软件的现状。指出了新的空调系统形式和运行模式的出现改变了室内得热到冷负荷的转化过程,需要研究新的负荷计算方法,指导新型空调系统的设计。

关键词：冷负荷计算方法热平衡方法辐射时间序列方法负荷计算软件建筑能耗模拟软件围护结构

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基于气象日序数的同时发生设计日挑选方法

湖南大学学报（自然科学版） 2023年第3期50卷 245-252页

作者：陈友明曹明皓方政诚湖南大学土木工程学院湖南长沙410082 建筑安全与节能教育部重点实验室(湖南大学) 湖南长沙410082

传统空调设计气象参数设计日对气象参数间的同时发生性考虑不足,导致空调系统的设计冷负荷与实际峰值冷负荷相差甚远.为挑选出计算空调系统设计负荷的更合理的同时发生设计日,提出了一种基于气象日序数的空调设计同时发生设计日挑选方法... 详细信息

传统空调设计气象参数设计日对气象参数间的同时发生性考虑不足,导致空调系统的设计冷负荷与实际峰值冷负荷相差甚远.为挑选出计算空调系统设计负荷的更合理的同时发生设计日,提出了一种基于气象日序数的空调设计同时发生设计日挑选方法.该方法首先定义气象日序数的概念,用历史实测气象数据和动态负荷计算模型计算房间动态负荷,基于室内热环境风险水平挑选通用气象日序数集,提出多维多参数聚类分析方法,从通用气象日序数集中选取代表性的同时发生设计日.运用该方法从中国香港和长沙的长年实测气象数据中挑选出两个地区的同时发生设计日.实例研究表明,该方法挑选出的同时发生设计日数量少,适合于工程设计应用.与传统设计日对比表明,气象日序数方法给出的同时发生设计日计算设计冷负荷准确性更高,能满足工程设计准确性要求.

关键词：空调系统设计同时发生设计日气象日序数传统设计日设计冷负荷

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建筑内表面吸放湿过程对室内环境和空调负荷影响的仿真研究

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暖通空调 1999年第5期29卷 5-9页

作者：陈友明陈在康陈晓晖湖南大学环境工程系深圳市三洋华强激光电子有限公司

提出了一个考虑室内表面材料吸放湿过程的建筑热湿过程简化模型，介绍了对室内空气湿度及空调负荷的仿真分析。仿真结果表明，室内表面材料吸放湿过程有明显的降低湿度变化幅度的作用。

关键词：吸放湿过程室内湿度空调负荷室内环境