带透平膨胀机的跨临界CO_(2)制冷循环热力性能研究  

Thermodynamic performance of transcritical CO_(2) refrigeration cycle with turbo expander

作　　者：张振迎 郝佳伟 许禹菲 杨美媛 常莉 ZHANG Zhenying;HAO Jiawei;XU Yufei;YANG Meiyuan;CHANG Li(College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学建筑工程学院,河北唐山063210

出　　处：《流体机械》2022年第3期40-46,共7页Fluid Machinery

基　　金：河北省自然科学基金资助项目(E2020209121);河北省省级科技计划资助项目(20474501D);唐山市基础创新团队资助项目(21130202D)。

摘　　要：为提高跨临界CO_(2)制冷循环的性能,提出了冲动式透平膨胀机(ITE)改进方案,该方案可以在回收膨胀功的同时实现双级压缩,对相应的制冷循环进行了热力学性能研究,获得了该循环最佳高压压力、最佳中间压力以及COP的变化规律。结果表明:当蒸发温度从-10℃变化到15℃,气体冷却器出口温度从30℃变化到50℃时,改进ITE制冷循环的COP相对基本制冷循环、回热制冷循环和传统ITE制冷循环,分别提高了38.4%~45.1%,31.1%~37.1%,21.5%~27.9%;蒸发温度越低,气体冷却器出口温度越高,改进ITE制冷循环的优势越明显。In order to improve the performance of transcritical CO_(2) refrigeration cycle,an improved impulse turbo-expander(ITE)was proposed.It can realize the two-stage compression while recovering the expansion work.The thermodynamic performance of the refrigeration cycle using the expander was analyzed.The variations of the optimum high pressure,the optimum intermediate pressure and the system COP were obtained.The results show that with the variation of evaporation temperature from-10℃to 15℃,when the gas cooler outlet temperature varies from 30℃to 50℃,the COP of the improved ITE refrigeration cycle is improved by 38.4%~45.1%,31.1%~37.1%and 21.5%~27.9%respectively compared to the basic refrigeration cycle,the refrigeration cycle with internal heat exchanger and the conventional ITE refrigeration cycle.The lower the evaporation temperature,the higher the outlet temperature of the gas cooler,and the more obvious the advantage of the improved ITE refrigeration cycle.

关 键 词：跨临界CO_(2)制冷循环 冲动式透平膨胀机 双级压缩 高压压力 

分 类 号：TH12[机械工程—机械设计及理论]