双蒸发器动态冰蓄冷机组的研究

发布时间：2018-05-18 18:57

本文选题：双蒸发器 + 动态冰蓄冷机组　；参考：《重庆大学》2014年硕士论文

【摘要】：我国高速增长的经济引起每年电力需求的急剧增加，电力供需形势依然紧张，利用需求侧管理的冰蓄冷技术可以实现电力负荷的削峰填谷，是缓解电力建设与新增用电矛盾的重要途径之一。冰蓄冷技术可减少制冷机组容量，降低空调系统运行费用，因此，冰蓄冷技术在我国得到了越来越多的应用。本文在传统的单蒸发器动态冰蓄冷机组的基础上提出了一种双蒸发器动态冰蓄冷机组系统，系统最主要的特点是制冰工况和冷水工况非共用蒸发器，制冰工况采用蜂窝板式蒸发器，冷水工况采用降膜蒸发器，提高了机组的制冷效率。机组可以充分利用夜间低谷电进行蓄冰，在蓄冰冷量不能满足空调负荷的需求时运行高效的冷水工况模式，既充分发挥了冰蓄冷空调运行经济性优势又不会导致系统装机容量的过大。同时介绍了系统主要部件特点及选型设计流程。基于GB/T10870-2001、GB/T26194-2010等相关标准研制了一种可以测试动态冰蓄冷机组和冷水机组性能的多功能性能试验台。提出了试验台的总体设计方案，试验台采用液体载冷剂法及机组热平衡法。冷水工况测试采用管路兑水法，结构简单，节能，可快速达到测试所需工况。具体阐述了试验台各系统的设计计算。试验台测控系统精确，能够满足相关性能试验标准的要求。双蒸发器动态冰蓄冷机组试验结果表明机组冷水工况和制冰工况下性能良好，达到了机组设计目标。利用传热学中相变传热的相关理论，，对双蒸发器动态冰蓄冷机组制冰过程进行了传热分析与优化，采用一维相变传热模型近似分析了机组制冰蒸发板制冰过程，探讨了不同制冰蒸发板制冰冷水进水温度下制冰厚度、制冰速率与时间的关系，以传热理论分析为基础，给出了一种确定机组制冰过程中最佳制冰时间的计算方法，理论上给出了不同制冰蒸发板制冰冷水进水温度下的最佳制冰时间。
[Abstract]:The rapid growth of the economy in China has caused a sharp increase in the demand for electricity every year. The situation of electricity supply and demand is still tense. The ice storage technology of demand side management can realize the peak filling and filling of power load. It is one of the important ways to alleviate the contradiction between electric power construction and new electricity use. The ice storage technology has been applied more and more in our country.
On the basis of the traditional single evaporator dynamic ice storage unit, this paper presents a dual evaporator dynamic ice storage unit system. The main characteristics of the system are the ice making and the cold water condition non common evaporator, the ice making condition adopts the honeycomb plate evaporator, the cold water condition adopts the falling film evaporator, and the refrigeration efficiency of the unit is improved. The group can make full use of night low valley electricity for ice storage and run efficient cold water mode when the ice storage capacity can not meet the demand of air conditioning load. It not only gives full play to the economic advantages of ice storage air conditioning, but also does not lead to the oversize of the system installed capacity. At the same time, it introduces the characteristics of the main components of the system and the process of selection and design.
Based on GB/T10870-2001, GB/T26194-2010 and other related standards, a multi-function test bench which can test the performance of dynamic ice storage unit and chiller is developed. The overall design scheme of the test bed is proposed. The test bed adopts the liquid refrigerant method and the heat balance method of the unit. The design and calculation of each system of the test rig are described in detail. The measurement and control system of the test bed is accurate and can meet the requirements of the related performance test standard. The test results of the dynamic ice cold storage unit with double evaporator show that the cold water condition and the ice production condition of the unit are good, and the design goal of the unit is achieved.
The heat transfer analysis and optimization of the double evaporator dynamic ice storage unit was carried out by using the theory of phase change heat transfer in heat transfer. The ice making process was analyzed by one dimensional phase change heat transfer model, and the ice making thickness, ice making rate and time were discussed. On the basis of the theoretical analysis of heat transfer, a method is given to calculate the optimum ice making time in the process of making ice in the process of making ice, and the optimal time for making ice under the water inlet temperature of different ice making evaporating plates is theoretically given.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB69

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