冰蓄冷低温送风与工位空调结合的探讨

简要介绍了在国际上应用日益广泛的冰蓄冷低温送风相结合的空调系统，同时解释了工位空调的概念，并在理论上进行了冰蓄冷低温送风与工位空调结合可行性分析，为今后进一步研究工位空调打下基础。     

冰蓄冷低温送风与工位空调结合的探讨

简要介绍了在国际上应用日益广泛的冰蓄冷低温送风相结合的空调系统,同时解释了工位空调的概念,并在理论上进行了冰蓄冷低温送风与工位空调结合可行性分析,为今后进一步研究工位空调打下基础.     

与冰蓄冷相结合的低温送风系统

说明冰蓄冷冷源与低温送风空调的结合形式,对冰蓄冷低温送风空调系统的运行特性及经济性进行分析.结果表明,低温送风空调与冰蓄冷技术相结合,可降低整个系统的初投资和运行费;室内相对湿度的降低,可以提高人体舒适感,改善室内空气品质.     

三峡大厦蓄能低温送风变风量空调系统设计方案和运行策略

介绍了三峡大厦冰蓄冷低温送风变风量中央空调系统的设计概况,着重指出了其中的设计优化点和创新点.详述了该系统的优化设计思路及运行控制策略,计算得到该系统全年的运行耗电量和电费,并与常规电制冷系统进行了比较,指出该项目采用冰蓄冷空调系统尽管增加了耗电量,但是将为用户节省可观的运行费用.由于空调末端形式复杂,节能量计算难度较大,低温送风变风量末端的节能量有待观察.     

冰蓄冷低温送风空调系统关键设备的研制

综述了国内外冰蓄冷空调的发展历史和现状,对冰蓄冷低温送风空调系统关键设备的研制进行了总结与评述;认为自主研发的导热塑料蓄冰盘管、低温风口和VAV变风量装置是适合于低温送风空调系统的理想设备。     

论冰蓄冷空调制冷系统的设计方法及其发展前景

本文阐明了冰蓄冷在现代空调制冷中极其广阔的发展应用前景；并指出冰蓄冷低温送风空调形式将成为九十年代和２１世纪环球集中空调的“主导”系统之一。揭示了冰蓄冷空调所产生的社会效益与现实经济效益是十分巨大的；它将使空调人工气候环境向高科技高效率方向发展，使人类普及空调设施被电力困拢中解放出来，在转嫁高峰缓解电力供应上作出了特殊的贡献。同时，还提出最佳冰蓄冷空调系统的设计选择原则，并通过冰蓄冷空调系统的工作     

论当代最优越的空调方式—冰蓄冷低温送风

本文介绍了冰蓄冷低温送风系统的特点、技术性能、设计方法和发展趋势,阐明冰蓄冷低温送风的优越性,尤其造价低,社会效益与经济效益显著,是空调发展史上继VAV送风量空调系统之后的重大变载,是当代建筑物省电节能,节省基建投资的好方法。     

浅谈低温送风空调系统设计

介绍了低温送风空调系统的特点、基本分类以及采用低温送风空调系统的适用条件,对低温送风空调系统设计过程中设计参数确定、空调器选择、风管保冷、新风分布及机房布置等主要环节作了详细的论述.     

冰蓄冷低温送风空调系统管路优化设计软件的开发

冰蓄冷空调系统中的低温送风风管及其保温与常规空调系统有很多差异,前者在计算上有着更高的要求。本文在研究以上两种空调系统特征及不同的基础上开发出了冰蓄冷低温送风管路优化设计软件,该软件在管路参数计算方面具备高精度及智能化,且可替代ID图及Moody图用于湿空气状态参数及比摩阻的精确计算。本文介绍了该软件的开发思路及基本功能。     

冰蓄冷与低温送风空调系统的设计及分析

将空调系统中的冰蓄冷技术和低温送风技术结合起来进行设计和分析,结果表明,冰蓄冷加低温送风空调系统相结合,不仅可以降低整个系统运行能耗及费用,在达到一定规模后反而可以降低整个系统的初投资;同时可以改善室内空气品质,提高人体舒适感。     

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.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

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.