制冷工程设计中降低开店成本的方法探讨

在超市制冷工程设计中,从制冷设备的摆放位置和制冷设备的选择等角度出发探讨降低超市开店成本的方法,为相关工程设计及其研究人员提供参考。     

制冷工程设计的微机可视化编程研究

以Visual Basic6．0语言，采用A．C．Cleand的制冷剂热力参数曲线拟合方程设计编写可视化制冷工程设计程序。用户界面友好，程序运行平稳，快捷，直观，覆盖面广，计算结果精度较高，适用于制冷工程设计和相关的科研数值计算和辅助教学。其中的双级压缩实际制冷循环可优化求解最佳中间温度和压力替代图解法。     

浅谈某生鲜加工配送中心设计施工的得与失

以某生鲜加工配送中心制冷工程设计施工为实例,介绍了主要冷区的设计特点,施工运行中所发现的如苯板锈蚀、夹层凝露等问题和解决措施,以及在设备配置与热回收系统设计中的得与失。以期为以后类似工程的设计施工提供参考。     

读者之声(续九)

冷冻医疗是新的理疗方法,对某些疾病确有良效,我们甚感兴趣,为普及和方便病人,我们想开展此项治疗,望得到贵会及《制冷》季刊帮助。广东惠阳人民医院理疗科(岑圣英)《制冷》杂志较适于制冷工程设计人员使用,是设计人员的一本很好参考资料。武汉市化工设计研究院(金立颖)     

《制冷装置安装工程施工及验收规范》通过专家审定

由国内贸易工程设计研究院起草的关于氢氟烃和氢氯氟类制冷剂的制冷装置安装工程施工及验收规范，7月24日在北京召开了送审稿的专家审定会，根据会上对管理、设计和施工方面提的意见，进行修改后报批稿，估计在2007年底将出版发行，以后将对用R22、R134。等制冷剂建设的冷库、制冷装置施工、验收起执法作用。     

学会动态

中国制冷学会从1989年末起至今已在北京、上海、福州、青岛、济南,成都、西安、长沙、啥尔滨、长春,广州、佛山、天津、黄石等地建立了中国制冷学会技术咨询服务部,为国内外制冷空调行业提供产品开发、工程设计及安装等服务。     

辐射吊顶与地板送风复合系统在办公建筑中的应用探讨

本文通过一个办公建筑工程设计实例,探讨辐射吊顶与地板送风复合系统的设计方法,对比了该系统与常规空调系统的用电装机容量及制冷季总运行能耗。结果表明,该系统的用电装机容量比其他系统小16％-34％;制冷季的总运行能耗比其他系统节约18％～41％。     

猪肉快速冷却制冷系统设计要点

快速冷却工艺对猪肉品质有着至关重要的影响,但是在实际使用过程中存在制冷效果不理想、结霜严重、耗电量大等问题。根据工程设计经验,提出关于猪肉快速冷却制冷系统工艺参数、冷负荷计算、冷风机布置、送风方式设计和融霜系统设计等问题的解决方案。     

丹佛斯“大中型冷库系统优化”系列路演活动在京落幕

9月5日,丹佛斯制冷与空调控制部2014年度大戏“大中型冷库系统优化”之旅在北京站顺利收官。当日,来自行业协会、国内贸易工程设计研究院、设备制造厂商、制冷工程公司等制冷界的同仁齐聚一堂,使得能容纳70人的北京丽都皇冠假日酒店会议厅座无虚席。     

壳体质量最小的制冷用压力容器优化设计

最优化设计方法是现代设计的一种重要方法,也是工程设计人一种重要工具。该文对制冷用压力容器的特点以质量最小为目标函数建立了容器壳体的优化设计数学模型,编制计算机程序,并对一实例进行计算,得出了优化结果。     

超市制冷系统压力损失过大的解决方案探讨

探讨了关于超市制冷系统在工程设计中遇到的一些常见问题,如由于管程过长和供液高度过高导致压力损失过大而引起整个制冷系统制冷性能下降,以及低温系统加装过冷器的成本分析等。     

制冷工程实验用微机测控系统

本文根据制冷工程实验中的需要，提出了一套静、动态数据采集和设备自动控制的微机测控系统的组建方案，并设计了电子膨胀阀的一种驱动电路。实践表明，根据该方案组建的测控系统在制冷工程实验中具有很大的适用性。     

在微机上实现制冷工程程序化设计

本文采用A．C．Cleand的制冷剂热力参数曲线拟合方程，选择Quick BASIC编程语言在微机上实现制冷工程程序化设计，程序运行平稳、快捷，方便，实用。与手工计算对比，可提高效率数百倍。     

利用Flash实现焓湿图表查询程序

湿空气的焓湿图在工程领域的应用非常广泛，也是制冷空调设计中不可或缺的基本物性图表之一。利用Flash实现的焓湿图表查询程序可以方便、快捷地获得湿空气各状态参数，对于实现制冷空调设计计算的计算机化、节省时间、提高效率有重要意义，具有一定的工程应用价值。     

Development of computer program for simulation of an ice bank system operation, Part I: Mathematical modelling

Since the use of standard engineering methods in the process of an ice bank performance evaluation offers neither adequate flexibility nor accuracy, the aim of this research was to provide a powerful tool for an industrial design of an ice storage system allowing to account for the various design parameters and system arrangements over a wide range of time varying operating conditions. In this paper the development of a computer application for the prediction of an ice bank system operation is presented. Static, indirect, cool thermal storage systems with external ice on coil building/melting were considered. The mathematical model was developed by means of energy and mass balance relations for each component of the system and is basically divided into two parts, the model of an ice storage system and the model of a refrigeration unit. Heat transfer processes in an ice silo were modelled by use of empirical correlations while the performance of refrigeration unit components were based on manufacturers data. Programming and application design were made in Fortran 95 language standard. Input of data is enabled through drop down menus and dialog boxes, while the results are presented via figures, diagrams and data (ASCII) files. In addition, to demonstrate the necessity for development of simulation program a case study was performed. Simulation results clearly indicate that no simple engineering methods or rule of thumb principles could be utilised in order to validate performance of an ice bank system properly.     

Recent developments in simulation techniques for vapour-compression refrigeration systems

Simulation has been widely used for performance prediction and optimum design of refrigeration systems. A brief review on history of simulation for vapour-compression refrigeration systems is done. The models for evaporator, condenser, compressor, capillary tube and envelop structure are summarized. Some developing simulation techniques, including implicit regression and explicit calculation method for refrigerant thermodynamic properties, model-based intelligent simulation methodology and graph-theory based simulation method, are presented. Prospective methods for future simulation of refrigeration systems, such as noise-field simulation, simulation with knowledge engineering methodology and calculation methods for nanofluid properties, are introduced briefly.     

Design optimization of thermoacoustic refrigerators

Thermoacoustic refrigeration was developed during the past two decades as anew, environmentally safe refrigeration technology. The operation of thermoacoustic refrigerators employs acoustic power to pump heat. Nowadays, as commercial applications are sought, it is important to be able to obtain fast and simple engineering estimates for the design and optimization of prototypes. This paper provides such estimates by implementing the simplified linear model of thermoacoustics - the short stack boundary layer approximation - into a systematic design and optimization algorithm. The proposed algorithm serves as an easy-to-follow guideline for the design of thermoacoustic refrigerators. Performance calculations applying the algorithm developed in this paper, predict values of 40–50% of Carnot's efficiency for the thermoacoustic core, the heart of a thermoacoustic refrigerator. One reason that these efficiencies have not yet been achieved in devices built to date, is the poor performance of the heat exchangers in thermoacoustic refrigerators. This issue and other remaining challenges for future research are also addressed in the paper. Solving these problems in the near future, we believe, will bring an environmentally safe refrigeration technology a step closer to commercial use.     

小型冷库制冷系统稳态仿真

对小型冷库制冷系统进行了稳态仿真.建立了压缩机稳态仿真模型,重点考虑了压缩机输运环节的计算.建立了热力膨胀阀模型,重点建立了流量与阀前后压差及制冷剂进出口干度的关系.实验表明,模型精度达到工程实用要求;结合实验和仿真分析,对小型冷库的运行和设计提出了建设性意见.