单级CO_(2)两级节流制冷系统的优化与热力学分析  

Optimization and thermodynamic analysis on single stage CO_(2) refrigeration system with two stage throttling

作　　者：周成君 Zhou Chengjun(Beijing jingkelun Refrigeration Equipment Co.,Ltd.)

机构地区：[1]北京市京科伦冷冻设备有限公司

出　　处：《制冷与空调》2021年第10期39-42,共4页Refrigeration and Air-Conditioning

基　　金：中国标准化研究院院长基金重大项目“资源高效利用标准化技术体系构建和应用”(542019Y-6659)。

摘　　要：以单级CO_(2)两级节流制冷系统为基础,为解决一级节流产生的闪发气体对系统的不利影响,对一级节流产生的闪发气体分别采用直接节流、并行压缩与引射循环3种处理方式进行优化,然后借助压-焓图进行热力学分析并对比。结果表明:在相同工况和同等制冷量的前提下加装引射器优化的制冷系统功耗最小,并行压缩次之;制冷工况确定后,制冷系统理论COP取决于一级节流后的干度值、饱和液体和饱和气体的焓值。Based on the single stage CO_(2) refrigeration system with two stage throttling,in order to solve the adverse effect of flash gas generated by first-stage throttling on the system,three processing methods,which are direct throttling,parallel compression and ejection cycle,are adopted respectively to optimize the system.Then the thermodynamic analysis and comparison are carried out with the help of pressure-enthalpy diagram.The results show that the power consumption of the system optimized with injector is the least under the same working condition and the same refrigeration capacity,followed by the parallel compression;when the refrigeration condition is determined,the theoretical COP of the refrigeration system depends on the dryness value,the enthalpy values of the saturated liquid and the saturated gas after the first-stage throttling.

关 键 词：制冷系统 热力学分析 CO_(2) 节流 并行压缩 引射循环 

分 类 号：TB6[一般工业技术—制冷工程]