节能型蒸发式冷凝器

近年来，随着国民经济的发展，人民生活水平的提高和食品进出口贸易的不断增长，新建和改建冷库越来越多，氨制冷系统得到了广泛应用。而其四大环节之一的蒸发式冷凝器也得到了不断的改进。本文简述节能型蒸发式冷凝器的原理结构，主要讨论设备运行中减少结垢和减缓结垢速度、减小冷凝盘管传热管的集液层厚度和传热液阻，提高传热系数，从而达到节能的目的。     

中压甲铵冷凝器防结垢方法探讨

分析中压甲铵冷凝器的工艺流程和操作条件，指出设计中的不足，找出其结垢的非药剂因素——温度和流速，对一些相关改造的成败提出观点，并提出增设加压泵回流控温和增大上、回水压差的新思路。     

大型汽轮机真空偏低原因分析及提高汽轮机真空的综合治理措施

本文根据徐州电厂的具体情况,分析了汽轮机真空偏低的原因,提出了提高汽轮机凝汽器真空的若干措施,可供同类型电厂参考。     

Effects of Working Fluid,Tubeside Enhancement and Bundle Depth on the Optimized Fin Geometry of a Horizontal Condenser Tube

A theoretical study has been made to optimize the fin geometry of a horizontal finned tube which is to be usedfor condensers that handle the vapor load of a liquid phase change cooling module.Systematic numerical calcu-lations of the vapor to coolant heat transfer have been performed for parametric values of fin height,fin spacing,vertical bundle depth and tubeside heat transfer coefficient.Three dielectric fluids (R-113,FC-72,and FC-87)at atmospheric pressure were selected as the working fluids.For a single tube with optimized fin geometry,theaverage heat flux increased in the order of FC-87,R-113 and FC-72.Both the optimum fin height and optimumfin spacing increased with increasing vertical bundle depth.     

A Model for Flooding Prediction in Circular Tubes

Flooding phenomenon limits the stability and the flow of a liquid film falling along the walls of a channel in which a gas is flowing upwards.As known, the entrainment effect can completely prevent the liquid to fall from its natural flow. The present work proposes a new mechanistic model for the prediction of the onset of flooding in vertical and inclined pipes in the presence of obstructions, as well as taking into account the viscosity effect. The good performance of the model in the different geometrical conditions and for variable viscosities of the liquid component assesses the validity of the hypothesis that the instability of a wavelike disturbance limits the countercurrent flow in a channel.     

爆炸胀管一例

本文介绍了用爆炸法胀管的一个成功例子，为爆炸胀管技术的运用积累了经验。     

粘接技术在冷凝器制造中的应用

粘接技术在冷凝器制造中的应用孟新光（华中理工大学计算中心，武汉市，４３００７４）１前言Ｈ３５型制冷机组的主要部件——冷凝器为制冷机组的一个主要部件，其作用是使高温高压的气态制冷剂冷却并凝结成液态制冷剂，制冷剂的物态变化所放出的热量由冷却物资（水或空气...