地埋管地源热泵系统设计中几个问题的看法

结合天津一个空调面积为14000m^2的地埋管地源热泵空调工程的设计，介绍对地埋管换热器的取热量和散热量进行测试的实验方法，为工程设计提供可靠的依据。对天津地区不加防冻液地埋管地源热泵机组进行讨论，并分析热泵机组采用满液式蒸发器，节能效果更加明显。     

空调器用翅片管式蒸发器铜管点蚀分析及预防措施

针对空调器用翅片管式蒸发器铜管点蚀泄漏故障,结合铜管点蚀失效机制,从使用环境及蒸发器结构方面进行分析。研究发现,空气中含有的氯气或氯化物、氨气等溶解于冷凝水中形成腐蚀性离子,蒸发器相邻翅片叠加位置存在明显的孔洞状间隙,使冷凝水长期积存引起腐蚀性离子对铜管表面的腐蚀破坏作用,是导致蒸发器铜管点蚀泄漏的根本原因,鉴于此,提出避开腐蚀源、采用高耐腐蚀铜管、在铜管表面涂覆缓蚀剂、优化蒸发器翅片与铜管接触结构等预防措施。     

A Process Integration based Approach for the Analysis of an Evaporator System

A scalable new mathematical model based on the principles of Process Integration has been developed for the analysis of multiple effect evaporator (MEE) systems. It uses the concepts of stream analysis, temperature path and internal heat exchange for the formulation of the model equations. In addition to the above concepts, the model also takes into account the variable physico‐thermal properties of steam/vapor, condensate and liquor, while simulating the MEE system. The present model consists of a set of linear equations and does not present any stability or oscillation problems during solution as is generally seen in the case of models that are based on sets of nonlinear equations. The model equations are automatically generated through a computer program and the model was run for three different liquor and flow sequences to prove its utility. The results obtained are compared with published models.     

Integrated System生产ClO2过程简介

介绍了加拿大Ｃｈｅｍｅｔｉｃｓ公司Ｉｎｔｅｇｒａｔｅｄ Ｓｙｓｔｅｍ生产ＣｌＯ２的原理、工艺流程、原材料消耗、系统安全性以及该法的优缺点。     

Research on corrugated multi‐louvered fins under dehumidification

To enhance automotive evaporator wet‐fin performances, the main task is to promote the draining of condensed water. An accurate and convenient apparatus estimating the fin performances has been developed. Through the measurement of corrugated multi‐louvered fin performances and the visualization of condensed water draining by this apparatus, it was clarified that fin geometries, surface coating, and evaporator installation strongly contributed to the efficiency of draining and fin performances. © 2001 Scripta Technica, Heat Trans Asian Res, 30(5): 383–393, 2001     

采用非共混制冷剂对冷水机组换热器的影响

针对R22近期替代物多为非共沸混合制冷剂的现实和替代工作开展的需要，分析了采用非共沸混合制冷剂代替单组分工质后凝结和沸腾换热相界面传质阻力对蒸汽压缩式冷水机组蒸发器、冷凝器传热性能的不利影响，给出了由此引起的传热系数降低程度的估算，基于分析结果，对采用非共沸混合制冷剂的冷水机组换热器选型及设计进行了讨论。     

Thermoeconomic optimization for a finned‐tube evaporator configuration of a roof‐top bus air‐conditioning system

This paper presents a methodology of a design optimization technique that can be useful in assessing the best configuration of a finned‐tube evaporator, using a thermoeconomic approach. The assessment has been carried out on a direct expansion finned‐tube evaporator of a vapor compression cycle for a roof‐top bus air‐conditioning (AC) system at a specified cooling capacity. The methodology has been conducted by studying the effect of some operational and geometrical design parameters for the evaporator on the entire cycle exergy destruction or irreversibility, AC system coefficient of performance (COP), and total annual cost. The heat exchangers for the bus AC system are featured by a very compact frontal area due to the stringent space limitations and structure standard for the system installation. Therefore, the current study also takes in its account the effect of the variation of the design parameters on the evaporator frontal area. The irreversibility due to heat transfer across the stream‐to‐stream temperature difference and due to frictional pressure drops is calculated as a function of the design parameters. A cost function is introduced, defined as the sum of two contributions, the investment expense of the evaporator material and the system compressor, and the operational expense of AC system that is usually driven by an auxiliary engine or coupled with the main bus engine. The optimal trade‐off between investment and operating cost is, therefore, investigated. A numerical example is discussed, in which a comparison between the commercial evaporator design and optimal design configuration has been presented in terms of the system COP and evaporator material cost. The results show that a significant improvement can be obtained for the optimal evaporator design compared with that of the commercial finned‐tube evaporator that is designed based on the conventional values of the design parameters. Copyright © 2007 John Wiley & Sons, Ltd.     

马铃薯淀粉生产工艺水的再循环设计

分析宁夏南部山区淀粉生产废水资源化需求及季节性生产、高水质大用水量、低温环境等多个生产影响因素,选择以四效减压蒸发技术为核心的废水再循环流程;采用可扩充和可重用的计算机辅助设计手段,通过再循环流程主要参数及所需工艺设备的计算与选型,设计结果达到蒸汽经济性较高的目的,可为解决淀粉生产缺水和污染提供技术参考。     

制冷用水平管降膜蒸发器管束换热特性数值模拟

采用分布参数法建立水平管降膜蒸发器管束换热模型,模拟计算了水平管降膜蒸发器不同管程布置下换热管干斑分布和平均降膜因子,并进行比较分析;并在下进上出的管程布置形式下研究了制冷剂流量、管间距、满液区排管数对蒸发器换热性能的影响。本文的研究为水平管降膜蒸发器的设计提供理论指导,促进其在制冷空调领域的推广应用。     

釜式蒸发器筒体局部应力计算方法探讨

釜式蒸发器的结构特点为:筒体变径、支座非对称布置、存在集中载荷,故无法直接引用JB/T 4731《钢制卧式容器》对其危险截面处筒体的局部应力进行计算。利用材料力学的基本原理并结合其结构及受力特点给出该类型卧式容器危险截面处筒体应力的计算检验方法以满足强度要求,保证设备的正常运行。