填料喷淋型全热回收器建模仿真及应用

根据填料喷淋型全热回收器中实际热质交换情况,通过合理简化假设,得出了空气与水热量和质量交换的数学模型;将数学模型的计算结果与试验结果进行了对比,二者具有良好的吻合性;分析了填料高度对能量吸收装置出口水温、空气出口焓值的影响;分析了填料高度对填料喷淋型全热回收器换热效率的影响。     

反渗透海水淡化技术最新研究动态

从降低海水反渗透淡化产水成本和环境友好过程的开发两个方面探讨了国内外海水反渗透淡化技术的最新研究成果和应用情况，包括能量回收器的研究、新型工艺过程的设计、海水反渗透膜的研究和应用、用膜法预处理代替传统化学器预处理以及NF—SWRO—MSF过程集成5个部分．     

一种全热回收器的设计开发与实验研究

阐述了一种全热回收器的设计及开发过程,并通过实验测试,研究分析了室内外温差、湿度差、焓差对全热回收器效率的影响;探讨比较了全热回收器与普通热管的节能性。     

利用废热解决冬季供暖热负荷的措施

运用变声速增压气体压缩方法，用具有一定压力的常温脱盐水通过变声速增压器引射发电厂汽轮机排出的低压水蒸汽，使其压力升高后进入蒸汽冷凝水(热)回收器。在蒸汽冷凝水(热)回收器内，低压水蒸汽放出潜热冷凝成水，与常温脱盐水共同成为回收器内压力下的具有较高温度的脱盐水。以此脱盐水作热源，建设供热站，对外供热，可满足冬季采暖用户对热能的需求。     

热回收型空调器的性能分析与实验研究

利用空调器本身的风机从热回收器内引进新风，通过热交换回收排风的能量。采用空气焓差法对空调器引进新风前后进行制冷量、输入功率、能效比（EER）等的对比实验，并测量了换热器的热回收效率。用热回收装置引进新风后基本没有改变空调器的输入功率，相同环境条件下的制冷量增加，EER值增大，焓差热回收效率最高可达到34．12％。     

转轮式热回收型蒸发冷却空调研究初探

目前热回收器的类型有板翅式、管式、热管式及转轮式等热回收器。比较了这几种热回收器的性能、优缺点及热回收效率,并介绍了一种新的空调组合:转轮式热回收型蒸发冷却空调,将转轮式热回收器集成到蒸发冷却空调系统中,在我国西北地区应用既能满足人的热舒适性,又能降低能耗。     

高速列车热回收技术可行性研究

以我国武广客运专线G1117次高速列车为研究对象,采用TRNSYS软件对列车空调系统安装热回收装置节能效果进行了模拟计算,通过计算结果对热回收装置的经济性进行了分析。研究结果表明:高速列车空调系统通过采用全热回收夏季的总节能量为1573.637kWh,节能率为34.6%;冬季全热回收总节能量为1152.780kWh,节能率为30%。安装热回收器的静态回收期为3.5年,因此,武广客运专线采用热回收装置的节能性和经济性较为显著。     

定影槽台架兼银回收器

圆筒形钢绒毛银回收器加料时,需用漏斗使废定影液通过进料管加入简体,操作非常麻烦。本文介绍箱形银回收器兼做定影槽台架,操作方便,设备简易,占地紧凑。箱形银回收器1由隔板2分成若干个银回收室3,相邻隔板上有交叉的下流孔4和上流孔5,末端银回收室箱体侧壁上     

燃油锅炉的余热回收利用简介

某制药厂燃油锅炉系统，采用热管式余热回收器，利用烟一水热交换后，对其尾部排烟余热回收利用，本文对这套装置进行介绍。     

某集中式空调水系统故障与原因分析

介绍集中式空调系统风冷式冷(热)水机组由于水系统维护问题导致的报警故障,并以某风冷螺杆式冷(热)水机组热回收器中换热铜管腐蚀泄漏故障为案例,通过对换热铜管的腐蚀处进行电子显微镜分析和化学分析以及水质检测,发现由于水系统水流量不足造成系统内部低压,外界空气通过排气阀进入热回收器,最终水中溶解氧含量超标导致热回收器中铜管腐蚀,指出必须重视集中式空调水系统的维护。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to