水源热泵在湖南地区推广的可行性探讨

对水源热泵空调系统作了简单介绍,分析了湖南地区气候特点、水资源状况以及水源热泵系统对水源系统的要求,以湖南省澧县某宾馆地下水源热泵空调系统和湖南省湘潭市城市中心区一期工程地表水源热泵空调系统为例,对水源热泵系统在湖南地区的应用进行了实例分析。     

基于湖水的水源热泵综合能源利用系统

在剖析空气源热泵与常规水源热泵系统利弊的基础上,结合实际工程,提出了利用湖水作为水源热泵冷热源的方案,阐明了基于湖水的水源热泵综合能源利用系统的形式和原理,探讨了这种系统的运行工况及规律,对比分析了系统的初投资和运行费用,对于水源热泵系统的设计、运行具有一定的指导意义.     

住宅用水源热泵机组动态数学模型研究

从系统仿真学原理出发，在质量守恒、能量守恒和动量守恒的基础上，充分考虑热泵各组件之问的相对关系，将压缩机与其周围空气的换热过程并入了蒸发器模型之中，建立了水源热泵中央空调机组动态数学模型。并通过自行搭建的10kW住宅用水源热泵实验台，验证了该数学模型的准确性和实用性。     

地表水水源热泵空调系统综合节能技术的应用

水源热泵技术是可再生能源利用技术,具有提高机组效率和降低系统运行费用的优点.根据实际工程情况,在应用水源热泵技术的同时,考虑多项节能技术的综合应用,空调系统的节能效果将更加明显.本文以实际工程为例,分析了将水源热泵技术与集中供冷供热技术、二次泵技术、变流量技术等其他节能技术综合应用,不但能更有效地发挥水源热泵技术的优点,并能大大提高空调系统的能效.     

某住宅小区地源热泵空调方案研究

介绍了南京某住宅小区地源热泵空调系统的方案设计,包括小区建筑空调冷热负荷、地埋管换热系统、辅助冷源、水源热泵机组选择、空调水系统组织、末端空调形式等,并对方案比选中的一些不同选项进行了讨论。     

中高温水源热泵研究与发展趋势

介绍了中高温水源热泵的概念和工作原理;中高温水源热泵的工质研究及近年来在国内外的研究现状与发展趋势,包括中高温水源热泵制冷剂和系统性能的研究.讨论了中高温水源热泵的应用情况以及在我国发展的趋势.     

水源热泵若干问题探讨

水源热泵系统设计与传统集中空调系统具有不同的处理方法,简要介绍了其中水源热泵系统在新风处理、蓄热技术的应用等方面的特殊方法。     

梅赛德斯奔驰文化中心空调设施设备运行保障措施研究

江水源热泵是采用地表江湖水作为热源和热汇的热泵系统,是地表水源热泵(Surface Water Heat Pump, SWHP)中常见一类,通过输入少量高品位能源(如电能),实现低温位热能向高温位转移。通常水源热泵消耗1kW的能量,用户可得到4kW以上的热量或冷量。黄浦江水是很好的热泵热源和空调冷源,水体温度较恒定,使热泵机组运行更可靠稳定,也保证系统的高效和经济性。作为一个运行了10年的江水源热泵系统,设备已进入全寿命的中期阶段,本文对如何做好运行维护的保障工作作了一个较为全面的记录,并通过工作回顾,指导今后大型活动的空调保障工作。     

延边地区采用地下水源热泵与地板供暖系统的技术经济分析

介绍了地下水源热泵机组与地板供暖结合的供暖系统,分析了两者结合应用的优点.对该系统和城市集中供热和散热器系统、城市集中供热和地板供暖系统、电加热地板供暖系统从一次能源消耗、初投资、运行费用等各方面进行了比较.技术经济分析表明,类似延边地区这种冬季采暖期长、地下水资源较丰富的地区,采用地下水源热泵与地板供暖系统相结合有很大的优势.     

夏热冬暖地区开式湖水源热泵空调系统的应用和试验研究

在夏热冬暖地区建立了一套开式湖水源热泵空调系统,在此基础上研究了湖水温度与气温、水体温升变化、室内热舒适性及系统性能(COPsys/EERsys)等,并进行了湖水源利用的可行性分析。研究结果为夏热冬暖地区开式湖水源热泵空调系统的推广应用提供了相关的试验参考。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.