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通过介绍喷雾降温蒸发冷却技术,指出国内首次将喷雾降温蒸发冷却技术大量应用在室外无建筑为依托的广场,实施了对室外空气进行等焓、降温、加湿处理;对比分析了西安和上海的典型气象年逐时参数,提出喷雾降温蒸发冷却技术在中等湿度地区、干燥地区会比高等湿度地区有较大应用前景和价值。 相似文献
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喷雾降温作为较为简便的室外降温措施,常应用于大型展览类建筑中。查阅文献资料,参考喷雾降温的成功工程案例,总结出喷雾降温系统的六条适用条件。根据厦门某会展的气象条件和展览频次,对照适用条件进行逐条分析,最终得出厦门某会展应用喷雾降温系统的可行性不高的结论。 相似文献
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李冬 《中国新技术新产品》2009,(14):14-14
文中简要介绍了电炉袋式除尘器的结构。在对除尘器风机实行PID变频调速的基础上,提出了为节约电能,提高除尘效果,混风降温、喷雾降温的模糊PID控制思想及策略。 相似文献
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应用直接空冷系统的空冷电站,在夏季极端高温条件下运行时机组性能会明显下降。在空冷单元中添加喷雾冷却装置能够极大改善空冷机组的运行特性。本文设计一套将喷雾增湿与蒸发冷却技术相结合的新型空冷喷雾装置。采用数值模拟与实验相结合的方式分析添加该喷雾系统后空冷单元的运行特性。结果显示该新型系统的空气降温与汽轮机背压降低效果良好。对应用该喷雾技术后的工程实例进行分析,实际运行情况表明该机组在夏季极端高温条件下运行良好,且耗水量被控制在理想的范围内。 相似文献
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城市核心地段钢筋混凝土内支撑爆破降尘措施 总被引:1,自引:0,他引:1
粉尘污染是城市中爆破拆除的一大危害,它直接影响爆破拆除在城市建设中的推广应用。在帝斯曼国际中心项目深基坑支撑梁爆破拆除施工中,采用现场试验的方法,在深基坑内支撑爆破工程中利用粉尘浓度仪分别测试了不采用降尘措施和采用多种不同降尘措施后15 min内爆破粉尘浓度,共进行3次试验,第一次采取铺设水袋,开启降尘喷雾系统,15 min后粉尘浓度降为8.9 mg/m3;第二次在第一次的基础上增加风送式喷雾降尘机,15 min后粉尘浓度降为4.1 mg/m3;第三次将在第二次的基础上增加洒水车,15 min后粉尘浓度降为1.27 mg/m3。爆破完成后,对测试结果进行了比较和分析,结果表明:采取设置水袋、降尘喷雾系统及风送式降尘炮及洒水车综合作用,降尘速度快,降尘效果最好,对于城市闹市中心深基坑钢筋混凝土爆破工程,适宜采取此种综合方式降尘。 相似文献
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测试了具有低太阳吸收率、高发射率的碱土金属碳酸盐的炎热地区“晒不热”涂料在不同模拟屋面上的降温效果.结果显示,在不同的屋面材料上涂刷“晒不热”涂料的降温效果不同,其中在油毛毡上涂刷“晒不热”涂料降温效果最好,可降温10.8℃;在砂浆板上涂刷“晒不热”涂料降温效果最差,降温2.5℃.在铁皮箱上测试24h的循环实验,白天与日间曝晒试验相符合,而夜间温度则要比环境温度低1~2℃,在不同季节的同一屋面的测试效果具有重复性. 相似文献
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[摘要]我国干法窑水泥生产线中增湿塔的使用一直不理想,由于降温设备技术落后,系统控制不及时,起不到降温、增湿的效果,增湿塔常出现湿地挂壁现象,而双流体喷雾降温系统依靠PLC集中精确的温度控制、先进的喷雾技术、故障率低、损耗小等特点,已广泛应用于各种行业的废气处理系统中。 相似文献
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为了提高机组的降温性能,根据高压喷雾与滴淋填料相结合的三级直接蒸发冷却空调机组的过程原理,以蒸发冷却理论与传热传质机理为基础,分别从空气侧、水侧两大方面对该机组降温性能的影响进行了初步分析,进而得出迎面风速、横断面上气流分布均匀度、淋水密度、水温、水气比以及填料性能和高压喷雾的结构对该机组降温性能的影响关系;并相应对高压喷雾与滴淋填料相结合的机组提出了改进的措施。该研究结果有助于对高压喷雾与滴淋填料相结合的机组设计及性能分析。 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995. 相似文献
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由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。 相似文献
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M. M. Gadenin 《Inorganic Materials》2013,49(15):1352-1356
It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle. 相似文献
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V. T. Kornienko 《Strength of Materials》1991,23(7):760-765
The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献