共查询到16条相似文献,搜索用时 125 毫秒
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改善汽轮发电机冷却技术是提高汽轮发电机单机容量的最有效、最现实途径。气体冷却器是汽轮发电机的重要设备之一。其传热与阻力性能将直接影响汽轮发电机的运行经济性和可靠性。为实现汽轮发电机气体冷却器的优化设计,对管束不同横向节距的波纹翅片型穿片式冷却器的换热和阻力性能进行了试验研究,分析了管束横向节距对气体冷却器换热和阻力性能的影响规律。研究成果对汽轮发电机气体冷却器的结构与性能优化具有重要的指导作用。 相似文献
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气体冷却器是汽轮发电机的重要设备之一。其传热与阻力性能将直接影响汽轮发电机的运行经济性和可靠性。为实现汽轮发电机气体冷却器的优化设计,对不同翅片间距的翅片管冷却器的传热和阻力性能进行了试验研究,得到了Re在3 000~190 000之间换热器翅片侧的传热和阻力特性,并分析了风速和翅片间距对气体冷却器传热和阻力性能的影响规律。研究成果对汽轮发电机气体冷却器的结构与性能优化具有重要的指导作用。 相似文献
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为满足不同容量的汽轮发电机通风冷却系统的需要,必须采用不同形式的翅片式气体冷却器,以进一步改善冷却器的传热与阻力性能。介绍了目前常用的不同翅片形式的穿片式气体冷却器的结构特点,分析了影响穿片式气体冷却器传热和阻力特性的主要因素,以期为穿片式气体冷却嚣的结构与性能优化提供参考。 相似文献
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核电汽轮发电机是核能发电的主要设备之一,其通风冷却性能是影响核电机组安全运行的重要因素。转子采用轴向—径向通风是大型核电汽轮发电机常用的通风系统之一。根据计算流体力学(CFD)的基本原理,对大型核电汽轮发电机转子通风系统的通风结构和性能进行了分析,建立了转子通风系统内冷却气体流动的三维计算模型,确定了相应的边界条件,进行了数值计算和分析,得到了该汽轮发电机转子线圈直线段各通风沟内冷却气体的流量分配规律,气隙内的流场及静压分布规律。研究结果可为汽轮发电机转子通风系统结构优化及温升计算提供参考。 相似文献
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板翅式换热器在大型电站汽轮发电机冷却系统中的应用研究 总被引:1,自引:0,他引:1
通过综合分析电站汽轮发电机冷却系统用空冷替代水冷的可行性,实用性,提出了板翅式换热器是一种可用于汽轮发电机散热的新颖冷却器。以300MW电站汽轮发电机冷却器为对象,设计了板翅式空-空冷却器,并研制小样,试验验证。研究结果为开发新产品提供了可靠依据。 相似文献
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为满足汽轮发电机不断地向大型化发展地需要,必须对大型汽轮发电机的通风系统进行优化设计,以提高其通风冷却效果。为此,国内外对影响汽轮发电机通风冷却状况的主要因素如冷却介质的流动与传热特性、不同通风系统的通风计算方法、通风系统的结构等进行了一系列理论分析和试验研究,并取得不少具有实际应用价值的成果。在对现有成果的分析和总结的基础上,指出了有待进一步研究之处。 相似文献
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大型汽轮发电机通风冷却方式研究 总被引:1,自引:0,他引:1
大容量汽轮发电机由于具有良好的经济性而成为电力工业和电机制造业的发展重点。汽轮发电机通风冷却方式与单机容量和性能之间存在制约的关系,是汽轮发电机向大容量、高参数发展时需要解决的关键问题之一。分析了汽轮发电机冷却方式的发展过程以及目前的发展状况和发展趋势,同时对不同冷却方式的特点和适用范围的进行了比较。 相似文献
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在玉柴某型柴油机上,通过装闭式循环强制通风油气分离器与开式循环油气分离器进行对比试验,研究闭式循环强制通风系统对发动机性能的影响.结果表明:加装闲式循环曲轴箱强制通风系统可调节发动机的曲轴箱压力在合理范围内变化;分离效率的高低直接影响到通入增压器压气机进气中含油量的高低.同时解决了开式循环曲轴箱通风系统中柴油机的含油废... 相似文献
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The major portion of energy in a building is consumed by heating, ventilating, and air-conditioning (HVAC). The traditional heating and cooling systems contribute greatly to the emission of greenhouse gases, especially carbon dioxide. Four different ways, i.e., Trombe wall, solar chimney, unglazed transpired solar façade, and solar roof, are adopted for solar heating. Similarly, two major ways, i.e., evaporative cooling and building integrated evaporative cooling are adopted for cooling of the building. Therefore, an attempt has been made in this paper to compile the developments of solar heating and cooling technologies in a building. 相似文献
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Buildings represent nearly 40 percent of total energy use in the U.S. and about 50 percent of this energy is used for heating, ventilating, and cooling the space. Conventional heating and cooling systems are having a great impact on security of energy supply and greenhouse gas emissions. Unlike conventional approach, this paper investigates an innovative passive air conditioning system coupling earth-to-air heat exchangers (EAHEs) with solar collector enhanced solar chimneys. By simultaneously utilizing geothermal and solar energy, the system can achieve great energy savings within the building sector and reduce the peak electrical demand in the summer. Experiments were conducted in a test facility in summer to evaluate the performance of such a system. During the test period, the solar chimney drove up to 0.28 m3/s (1000 m3/h) outdoor air into the space. The EAHE provided a maximum 3308 W total cooling capacity during the day time. As a 100 percent outdoor air system, the coupled system maximum cooling capacity was 2582 W that almost covered the building design cooling load. The cooling capacities reached their peak during the day time when the solar radiation intensity was strong. The results show that the coupled system can maintain the indoor thermal environmental comfort conditions at a favorable range that complies with ASHRAE standard for thermal comfort. The findings in this research provide the foundation for design and application of the coupled system. 相似文献
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地铁空调通风环境控制系统的节能探讨 总被引:10,自引:0,他引:10
针对地铁空调通风系统的负荷特点,提出了控制新风量、变频调速、设置冰蓄冷集中供冷站、目标温度控制以及自动化运行管理等节能技术和措施,并对这些方案进行了经济性分析。 相似文献
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Heating, ventilating, and air-conditioning (HVAC) are parts of the major energy consumption in a building. Conventional heating and cooling systems are having an impact on carbon dioxide emissions, as well as on security of energy supply. In this regard, one of the attempts taken by researchers is the development of solar heating and cooling technologies. The objective of this paper is to review the passive solar technologies for space heating and cooling. The reviews were discussed according to the working mechanisms, i.e. buoyancy and evaporative effects. The advantages, limitations and challenges of the technologies have been highlighted and the future research needs in these areas have also been suggested. 相似文献