共查询到20条相似文献,搜索用时 125 毫秒
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针对干式风机盘管空调系统在运行中存在的一些困难,通过对3个不同建筑热工区域的代表城市的夏季空调方案的计算,比较了使用全热交换器前后的应用效果,指出了利用全热交换器预处理新风是解决干式风机盘管空调系统运行困难和降低新风机组能耗的有效手段. 相似文献
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针对干式风机盘管空调系统在运行中存在的一些困难,通过对3个不同建筑热工区域的代表城市的夏季空调方案的计算,比较了使用全热交换器前后的应用效果,指出了利用全热交换器预处理新风是解决干式风机盘管空调系统运行困难和降低新风机组能耗的有效手段。 相似文献
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一、前言我国已颁布的有关风机盘管机组的标准有四个,即机械工业部标准JB4283.1-86“房间风机盘管空气调节器型式与基本参数”,JB4283.2-86“房间风机盘管空气调节器技术条件”和JB4283.3-86”房闻风机盘管空气调节器试验方法”,国家专业标准ZB J72 081“房间风机盘管空气调节器安全要求”,这些 相似文献
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介绍了半集中式蒸发冷却空调系统的设计过程,对应用在新疆某电厂办公区的半集中式蒸发冷却空调系统进行详细的测试分析.测试结果表明:三级蒸发冷却新风机组将室外干球温度为35℃,湿球温度为19.8℃的空气,处理至干球温度为15℃低温空气送入室内.蒸发冷却高温冷水机组制取干球温度为17℃的冷水,完全满足干式风机盘管的要求.整个半集中式蒸发冷却串联系统中,风机盘管回水在高温表冷器中可以将室外空气的温度降低7℃以上,形成了冷量的多重利用.同时希望通过这样的实例设计过程分析为相关的设计人员提供一定的参考. 相似文献
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M. E. Frantsev 《Russian Journal of Nondestructive Testing》2013,49(1):1-7
A technique for the nondestructive testing of ship hulls that are made of composite materials in the process of their operation is considered. The study was performed using the impedance method and the free-vibration method taking the peculiarities of the test-object design into account. The results are presented. 相似文献
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针对目前车用交流发电机变速噪声测试尚无统一标准,采用试验研究的方法对测试过程的方案设计和关键参数的选取进行了研究。所得结论可对车用交流发电机变速过程噪声测试提供参考。 相似文献
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分析了热处理工艺中奥氏体化温度和时间、等温淬火温度和时间对奥贝球铁性能的影响。确定了阀门驱动装置用奥贝球铁材料蜗轮的生产工艺。通过装机试验验证,研制的奥贝球铁材料蜗轮满足使用性能要求,降低了生产成本。 相似文献
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Tammam Salloum Bernard Anselmetti Kwamivi Mawussi 《The International Journal of Advanced Manufacturing Technology》2009,45(7-8):666-678
This paper presents the manufacturing process for complex parts in the aim of building functional prototype mechanisms. Functional prototypes are used during testing in order to validate new product design. Their layouts are very similar to the final product, wherein lies the interest of testing many modifications. The mechanism must respect the functional geometrical requirements and be capable of withstanding forces or, for example, ensuring a tight seal. The principle being proposed consists of decomposing the complex parts into several simple ones that can then be manufactured on a five-axis, high-speed milling machine from thick (approximately 40 mm) sheets made of resistant materials, notably aluminum. The problem at hand is threefold: the choice of slicing in order to avoid cutting functional areas; the choice of both positioning mode and sheet fastening mode; and lastly, the choice of machining process. This paper also presents a detailed application with a machining simulation, using CATIA (Dassault Systèmes) for a five-axis MIKRON UCP 710 milling machine. 相似文献
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Fuel flow rate is the most important and most used control parameter for aero engines and it is assured by a device called the fuel control unit (FCU). To investigate factors that determine the metering performance of the fuel control unit, this research comes into being. This paper establishes mathematical models revealing the effect of these determinants, which are pressure difference across the metering valve and actuating process of the metering valve. Results show that the pressure difference does not keep constant as we thought. It will influence the accuracy of metered fuel of the fuel control unit. Furthermore, factors such as the input current of the servo valve, the pressure of the servo fuel and the moving direction of the metering valve will have impacts on the actuating process of the metering valve, influencing the dynamic response of the fuel control unit. Finally, the analyses are affirmed in a hardware-in-the-loop (HIL) experiment involving a real fuel control unit. 相似文献