Design and dynamic analysis of a novel scroll compressor-expander unit for the CO2 air conditioning system in electric vehicles

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外文标题：Design and dynamic analysis of a novel scroll compressor-expander unit for the CO2 air conditioning system in electric vehicles

外文摘要：Transcritical CO2 refrigeration cycle systems hold significant promise for improving the energy efficiency of air conditioning system in vehicles,diminishing reliance on traditional energy sources,and reducing environmental impact.Utilizing a scroll compressor-expander unit(SCEU)to recover energy during the expansion process enables the effective conversion of expansion work into useful work,thereby enhancing the efficiency of the entire refrigeration cycle.This paper provides a detailed description of the geometric structure of the SCEU,and based on this,conducts an exhaustive mechanical analysis of its orbiting scrolls and main shaft,thus establishing dynamic models.Computational results indicate that in transcritical CO2 refrigeration systems,the SCEU aids in recovering expansion work,increasing the coefficient of performance(COP)by 8.2％under standard operating condition.Additionally,this paper pioneers in studying the dynamic characteristics of SCEU under variable conditions.It is found that although the COP of the systems decreases with the rise of working pressure,compared to traditional systems,its rate of improvement progressively increases.Under conditions of negligible leakage and an isentropic efficiency of 60％,the SCEU can potentially increase the COP of the system by up to 9.8％.

外文关键词：

transcritical CO2 refrigeration cycle systemsair conditioning system in vehiclesscroll compressor-expander unitdynamic models

作者：

HU HaoYu、YANG Xu、CAO Feng、YIN Xiang、SONG YuLong

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作者单位：

School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China

关键词：

transcritical CO2 refrigeration cycle systems air conditioning system in vehicles scroll compressor-expander unit dynamic models

出版年：

2024

DOI：

10.1007/s11431-023-2656-4

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.67(12)