同时供冷供热双级压缩制冷热泵循环系统（火用）分析

发布时间：2018-03-10 20:49

本文选题：(?)损失系数　切入点：(?)平衡　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：日常生活中,人们在对冷量需要的同时还有对热量的需求,为了同时满足这两种需求,业内研究人员设计了一系列比较节能的系统,目前,得到普遍应用的是具有热回收功能的制冷机或空调机组,但此方案存在着不足之处,即其制热量是有限的,为了解决这个问题,近年,本课题组提出了一种可同时供冷供热的双级压缩制冷热泵循环,并依据热力学第一定律对此循环进行了理论分析,结果发现其具有更经济、更节能的优势,同时也很好的解决了热回收式制冷系统所出现的问题。本文是对该循环系统的更深入研究,期望通过(?)分析找出系统存在的薄弱环节,指出系统进一步改善的途经和方向。即于此,本文建立了该系统各个部件(高低压压缩机、热水加热器、热源侧换热器、用户侧换热器、节流阀G、节流阀H)的(?)分析模型,然后依据(?)分析方法的主要评价指标进行计算,在此基础上着重分析了室外空气温度ta、制冷剂流量比α、冷凝温度tc、蒸发温度te、过冷度、传热温差△t对系统(?)效率的影响,并且通过对比系统各部件的(?)损失系数和(?)损率,找出了系统的薄弱环节,结果显示：在低制冷剂流量比下,系统(?)损失的主要部位为热源侧换热器D、冷凝器C、节流阀G、高压压缩机B；在高制冷剂流量比下,系统(?)损失的主要部位为节流阀H、冷凝器C、高压压缩机B、低压压缩机A。在此基础上对系统进行了优化,给出了优化后系统的(?)分析模型,并进行了全面的分析计算,与优化前的系统进行了对比,结果发现：经济器能提高系统的(?)效率、弥补系统存在的薄弱环节。
[Abstract]:In daily life, people need both cooling and heat. In order to meet these two needs, researchers in the industry have designed a series of more energy-efficient systems. Refrigerators or air conditioners with heat recovery function are widely used, but this scheme has some shortcomings, that is, its heating capacity is limited. In order to solve this problem, in recent years, This paper presents a two-stage compression refrigeration heat pump cycle which can be used for cooling and heating at the same time. According to the first law of thermodynamics, this cycle is theoretically analyzed. The results show that the cycle is more economical and energy saving. At the same time, it also solves the problem of heat recovery refrigeration system. The weak links of the system are analyzed and the ways and directions of further improvement are pointed out. In this paper, the components of the system (high and low pressure compressor, hot water heater, heat source side heat exchanger, user side heat exchanger, throttle valve G, throttle valve H) are established. Analysis of the model, and then based on? Based on the calculation of the main evaluation indexes of the analytical method, the outdoor air temperature ta, the refrigerant flow ratio 伪, the condensation temperature TC, the evaporation temperature tete, the undercooling degree, the heat transfer temperature difference t to the system are analyzed emphatically. The impact of efficiency, and by comparing the components of the system? Coefficient of loss and? The result shows that under the low refrigerant flow ratio, the system is weak. The main parts of loss are heat source side heat exchanger D, condenser C, throttle valve G, high pressure compressor B. The main parts of loss are throttle H, Condenser C, High pressure Compressor B, low pressure Compressor A. On this basis, the system is optimized, and the optimized system is given. The model is analyzed and calculated, and compared with the system before optimization, the result shows that the economizer can improve the system. Efficiency, make up for the weakness of the system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

【参考文献】