空分设备加温流程的优化与应用

介绍了兖矿鲁南化肥厂3套空分设备停车加温流程存在的问题,针对3套空分设备的特点,充分利用资源,将其加温流程连通改造。改造投用后经济效益明显,达到了资源互补、节能降耗的目的。     

天棚辐射采暖制冷与置换式新风技术的应用

介绍北京某高档住宅天棚辐射采暖制冷及置换式新风技术的实际应用情况,通过对其冬季采暖热负荷指标、新风热负荷指标以及室内动态热舒适条件进行测试,阐述天棚辐射采暖制冷与置换式新风技术在节能及热舒适度方面的优势。     

Methodology for uncertainty calculation of net total cooling effect estimation for rating room air conditioners and packaged terminal air conditioners

This article presents the general procedure for uncertainty calculation of net total cooling effect estimation for rating room air conditioners and packaged terminal air conditioners, by means of measurements carried out in a test bench specially designed for this purpose. The uncertainty analysis presented in this work looks for establishing a confidence degree or certainty of experimental results. It is particularly important considering that international standards related to this type of analysis are too ambiguous when treating this subject. The uncertainty analysis is on the other hand an indispensable requirement to international standard ISO 17025 [ISO, 2005. International Standard. 17025. General Requirement to Test and Calibration Laboratories Competences. International Organization for Standardization, Geneva.], which must be applied to obtain the required quality levels according to the Word Trade Organization WTO.     

数据中心用蒸发冷却（凝）空调机组的设计及试验分析

本文提出一种新型数据中心用蒸发冷却(凝)空调机组,将蒸发冷却、蒸发冷凝、机械制冷技术三者结合,加大了自然冷源的应用时间。阐述其运行模式,并结合数据中心机房特点,介绍适合数据中心机房的机组运行模式。设计一台风量为20000 m 3/h的试验样机,并通过调节喷淋水流量,对其各功能段最佳性能进行了测定,得出该机组直接蒸发冷却段在水气比为0.37时,效率为97.22%;间接蒸发冷却段在水气比为0.28时,效率为62.98%。对其在乌鲁木齐、兰州、西安、上海4个典型城市的适应性分区进行了分析,并以新疆某数据中心为例,对比分析其年耗电量,采用该蒸发冷却(凝)空调机组年节电率为51.4%。     

Optimization of high-speed heating (cooling) an elastic body

In this work, the author combines the problem of the threshold stress state of an elastic homogeneous isotropic body and the high-speed action of the technological process of heating or cooling. Special attention is given to the problem of optimizing high-speed heating (cooling) on the basis of the parameter of the time-dependent temperature of the environment. The control item is the stress intensity, and the criterion of the threshold state is the Huber-Mises strength criterion. To solve the problem, the standard equations of the thermoelastic state are presented in generalized variables. This excludes several parameters of the problem including the required ones. Direct uncoupled boundary problems of thermal conductivity and elasticity are solved in the dimensionless form by the selected method. The return from generalized variables through the perimetry complexes to the initial variables determines the required values of the parameters of control of heat exchange of the elastic body.Translated from Problemy Prochnosti, Nos. 5–6, pp. 124–131, May–June, 1995.     

氮气循环制冷实现空分设备裸冷

根据生产需要，提供了利用氮气循环制冷实现空分设备裸冷的工艺方法，分析了实施过程中的注意问题；优化裸冷操作，降低能耗，节约成本。     

氮气循环制冷实现空分设备裸冷

根据生产需要,提供了利用氮气循环制冷实现空分设备裸冷的工艺方法,分析了实施过程中的注意问题;优化裸冷操作,降低能耗,节约成本。     

大型空冷机组真空泄漏诊断及对策

根据多年火电机组真空泄漏检测经验,分析大型空冷机组真空泄漏产生的原因,通过研究氦质谱检测技术和超声波检测技术,归纳总结出大型空冷机组真空泄漏诊断技术,并在大型空冷机组应用,消除真空系统泄漏,确保大型空冷机组安全经济运行,同时提出防止真空系统泄漏应该采取的措施.     

Application of air cooled condensers in European supermarket refrigeration systems

The application of air cooled condensers in European supermarket refrigeration systems is discussed. Compressors are usually hermetic or open types with capacities in the 5 kW range. Advantages over water-cooled systems are lower initial and operating costs and easier maintenance. There are, however, a number of problems, primarily sensitivity to ambient air temperatures which causes high condensing temperatures in hot summer weather and consequently a substantial increase in energy demand. Problems can also arise when the air temperature falls below 0°C; the condensing pressure must be maintained by fan speed control, air flow control or reduction of active heat transfer surface by flooding.