江西省能源研究会第三届理事会工作报告

尊敬的各位领导、各位来宾、各位代表: 江西省能源研究会自第三届代表大会召开以来,在省科协、省民政厅的领导和政府有关部门的支持下,在中国能源研究会的指导下,在各专业委员会、各位理事和会员的共同努力下,遵循研究会的宗旨,积极发挥研究会的社会学术团体的优势,通过开展学术交流、科学普及、人才培训、编辑出版、国际交流和咨询服务等活动,为提高我省能源科学技术水平和能源管理水平,促使我省能源事业的健康发展发挥了积极的作用.     

加强建设项目环境保护管理工作

根据北京市环境状况公告的统计数据,2003年,全市国内生产总值为3663.1亿元,总人口达到1456.4万人,能源总消耗4707.5万tce.同时,能源需求不断增加,机动车数量快速增长,水资源持续短缺,给首都环境质量和生态改善工作带来较大压力.北京现在已经是一个大工地,近几年每年施工建设的开复工面积均在1亿m2左右,背后包含着若干个大大小小的建设项目.如何处理好建设项目在实施过程中与环境保护的关系,值得我们认真思考、总结.     

整合区域资源做强产业集团——江苏元升太阳能集团在京举行新闻发布会

1月5日下午,主题为"整合区域资源,做强产业集团"的江苏元升太阳能集团新闻发布会在北京人民大会堂隆重举行.出席发布会的有国家质检总局、国家名牌推进委员会等十几个单位的领导和专家,江苏元升太阳能集团所在的省市相关部门领导也出席了发布会.来自40多家新闻单位的记者参加了此次发布会.     

不同浓度沼液对反季大叶芹产量和质量的影响

试验研究了不同浓度的沼液对温室反季大叶芹产量和质量的影响,试验结果表明:不同浓度的沼液对反季大叶芹都具有增产作用,其中质量分数为50%的沼液效果最佳,产量比对照增产48.1%.同时,施用沼液为生产无公害绿色反季大叶芹创造了条件,达到了增产增收的目的.     

浅谈九江-南昌-樟树成品油管道工程对当地社会经济的影响

管道运输既是一种适合于油品特性的运输方式,又可以解决目前成品油运输成本高、能耗大、损耗高、安全性差和不利于环境和生态保护等一系列难题.九江-南昌-樟树成品油管道工程的兴建将对改善当地成品油的运输结构以及缓解江西省内铁路的运输紧张状况起到重大作用,可以尽快从根本上解决管道沿线地区成品油运输难的问题,满足地区经济发展的需要,实现生产力布局与交通运输布局的合理结合,加快地方经济的发展.     

新加坡的交通污染控制

随着经济的增长与城市化的扩张,交通堵塞及机动车气体排放导致的大气污染日益严重,成为多数国家的环境难题.着重介绍新加坡在解决这一问题方面的实践,以期关于这些政策和方法的考察对我国有所借鉴意义.     

Enhancement of Thermo-Flow Performances by Windbreakers for Two-Tower Indirect Dry Cooling System

The winds will greatly weaken the cooling performance of indirect dry cooling system with twin towers.The exterior windbreakers are recommended to restrain the wind adverse effects in this paper.The macro heat exchanger model was adopted to simulate the heat exchange between circulating water and ambient air.The performances of natural draft dry cooling system(NDDCS)with and without exterior windbreakers were numerically studied.The pressure,velocity and temperature distribution of cooling air in wind angles of 0°,45°and 90°was obtained and presented.The results show that in all wind directions,the performances for lateral sector of towers with windbreakers are significantly improved,but the low-pressure zone appears unexpectedly for the rear sectors,which reduces the air flow rate.The cooling performances of the twin towers with or without windbreakers decrease at first but then recover with the wind velocity increasing.Besides,the optimal flow and heat transfer performances appear in the wind angle of 0°.The cooling performances can be significantly improved in all three wind directions due to windbreaker configuration.     

Investigation of Heat Transfer Augmentation between the Ribbed Plates via Taguchi Approach and Computational Fluid Dynamics

Heat transfer and turbulent flow characteristics between the ribbed plates have been numerically studied in the present paper.The ribs with the rectangular cross-section have been placed on the top and the bottom plates of the duct,symmetrically.It is assumed that the fluid at 300 K has entered the system while the walls kept at 400 K.All numerical analyses have been performed by k-ωShear Stress Transport(SST)turbulence model for Re=10000,15000 and 20000.For the fixed rib width,the dimensionless height and the dimensionless spacing have been respectively varied as 0.1≤h’≤0.3 and 0.5≤S’≤1,and the results have been compared with the ones of the smooth plate.Even though there are twenty-seven cases obtained as a result of parametric combinations,the number of various cases has been reduced from twenty-seven to only nine different variations by applying the Taguchi method.Furthermore,the effects of all the considered parameters on the heat transfer and flow characteristics have been determined in terms of the influence degree.The optimum parameters for Nusselt number and pressure loss have been ascertained individually.What is more,the almost exact values for Nusselt number and pressure loss have also been attained by the confirmation test having an error percentage of 6%.The most dominant factor has been determined as the rib height due to its effect on both heat transfer and flow characteristics.Similarly,with respect to the numerical results,increasing the rib height,the rib spacing and Reynolds number has separately increased Nusselt number.Nevertheless,symmetrical flow structure has been disturbed as a result of ascending the rib height as clearly seen for h’=0.3 from the charts.In the meantime,pressure loss has been augmented owing to the increment of the geometrical parameters and also Reynolds number.h’=0.1 with S’=0.5 at Re=10000,h’=0.2 with S’=0.5 at Re=15000 and h’=0.1 with S’=0.75 at Re=15000 can be suggested for the heat transfer enhancement since the pressure loss of the system is tolerated.     

Experimental Study on Jet Impingement Boiling Heat Transfer in Brass Beads Packed Porous Layer

Jet impingement boiling has been widely used in industrial facilities as its higher heat transfer coefficient(HTC)and critical heat flux(CHF)can be achieved in comparison with the pool boiling.By covering beads packed porous layer on the heated wall surface,the enlarged heat transfer area and rise of nucleation sites for boiling occur,thus,the heat transfer performance of boiling can be enhanced.For the jet impingement boiling with brass bead packed porous layers,the heat transfer performance is crucially influenced by the characteristics of porous layer and working fluid flow,so the experiments were conducted to investigate the effects of the jet flow rate,fluid inlet subcooling,number of porous layer and brass bead diameter of porous layer.Comparison study shows that impingement boiling promotes the HTC and CHF as 1.5 times and 2.5 times respectively as pool boiling at similar conditions.Higher heat transfer performance can be obtained in the cases of a higher jet flow rate and a higher fluid inlet subcooling,and there exist the optimal layer number and bead diameter for heat transfer.Particularly,a double-layer porous layer results in an increase of 39%in heat flux at superheat of 30 K compared with a single-layer case;a single porous layer at d=8 mm brings an increase of 23%in heat flux at superheat of 30 K compared with that of bare plain surface.Besides,the actual scene of jet impingement boiling was recorded with a camera to investigate the behavior evolution of vapor bubbles which is highly correlated to the heat transfer process.     

Numerical Simulation of Dual-Phase-Lag Model and Inverse Fractional Single-Phase-Lag Problem for the Non-Fourier Heat Conduction in a Straight Fin

In recent years,many studies have been done on heat transfer in the fin under unsteady boundary conditions using Fourier and non-Fourier models.In this paper,unsteady non-Fourier heat transfer in a straight fin having an internal heat source under periodic temperature at the base was investigated by solving numerically Dual-Phase-Lag and Fractional Single-Phase-Lag models.In this way,the governing equations of these models were presented for heat conduction analysis in the fin,and their results of the temperature distribution were validated using the theoretical results of Single and Dual-Phase-Lag models.After that,for the first time the order of fractional derivation and heat flux relaxation time of the fractional model were obtained for the straight fin problem under periodic temperature at the base using Levenberg-Marquardt parameter estimation method.To solve the inverse fractional heat conduction problem,the numerical results of Dual-Phase-Lag model were used as the inputs.The results obtained from Fractional Single-Phase-Lag model could predict the fin temperature distribution at unsteady boundary condition at the base as well as the Dual-Phase-Lag model could.