Article(id=1320037384884961762, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-0329.2025.12.003, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1737043200000, receivedDateStr=2025-01-17, revisedDate=1751990400000, revisedDateStr=2025-07-09, acceptedDate=null, acceptedDateStr=null, onlineDate=1792651037664, onlineDateStr=2026-10-22, pubDate=1767110400000, pubDateStr=2025-12-31, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792651037664, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792651037664, creator=13701087609, updateTime=1792651037664, updator=13701087609, issue=Issue{id=1320037383882519364, tenantId=1146029695717560320, journalId=1316781260334530699, year='2025', volume='53', issue='12', pageStart='1', pageEnd='118', issueExtLink='null', onlineDate='null', pubDate='1767110400000', pubDateStr='2025-12-31', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792651037426, creator='13701087609', updateTime=1792656182714, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320058964839093145, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320058964839093146, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1320037383882519364, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=22, endPage=28, ext={EN=ArticleExt(id=1320037385069511139, articleId=1320037384884961762, tenantId=1146029695717560320, journalId=1316781260334530699, language=EN, title=Effect of oil circulation rate on the performance of new energy vehicle R290 compressor, columnId=null, journalTitle=Fluid Machinery, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To improve the energy efficiency of new energy vehicle air conditioning systems,educe their heating energy consumption,and lower the global warming potential (GWP) and ozone depletion potential (ODP) of the refrigerant,a performance test system for a new energy vehicle R290 compressor was established.Experimental studies were conducted on the effects of charge amount and system parameters on the oil circulation rate (OCR),and the influence of OCR on the performance of the R290 compressor.The results indicate that the system oil charge amount significantly affects the system OCR,showing an exponential increase.The optimal operating range for OCR is 2% to 10%.For every 10 ℃ decrease in evaporation temperature,the OCR decreases by approximately 3%,while for every 5 ℃ increase in condensation temperature,the OCR decreases by about 1.5%.The condensation temperature has a greater influence on OCR than the evaporation temperature.The cooling capacity increases with higher oil content;the nominal cooling capacity is greater than the actual cooling capacity,and the cooling capacity attenuation rate also increases.At a compressor speed of 3 600 r/min,when the OCR is around 5%,the cooling capacity attenuates by approximately 8.0%,whereas when the OCR is around 10%,the cooling capacity attenuates by about 13.5%,but the actual cooling capacity increases by approximately 3.5%.As the compressor speed increases,the isentropic efficiency increases while the discharge temperature decreases.When the oil circulation rate increases from 5% to 10%,the compressor discharge temperature decreases by about 5 ℃.Appropriately increasing the compressor speed,lubricant charge amount,evaporation temperature,or lowering the condensation temperature is beneficial for improving compressor operating performance and ensuring stable operation.This study provides a reference for the optimal design of new energy vehicle air conditioning systems.

, authors=Jianhong CHEN1, 2, 3, Leren TAO1, 2, Yue DING1, Xiaofei WANG4, Xingjiang LI1, Haonan CHEN1, Lihao HUANG1, 2, authorsList=Jianhong CHEN, Leren TAO, Yue DING, Xiaofei WANG, Xingjiang LI, Haonan CHEN, Lihao HUANG, authorCompany=null, correspAuthors=Lihao HUANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320037388471091708, articleId=1320037384884961762, tenantId=1146029695717560320, journalId=1316781260334530699, language=CN, title=油循环率对新能源汽车R290压缩机性能的影响, columnId=1317484286475883136, journalTitle=流体机械, columnName=试验研究, runingTitle=null, highlight=null, articleAbstract=

为提高新能源汽车空调的能效,减少新能源汽车的制热能耗,以及降低空调制冷剂的全球变暖潜值(GWP)和臭氧消耗潜值(ODP),搭建了一套新能源汽车R290压缩机性能测试系统,试验研究充注量及系统参数对油循环率(OCR)及油循环率对R290压缩机性能的影响。结果表明,系统油的充注量对系统油循环率影响较大,呈指数上升,OCR的最佳运行范围为2%~10%;蒸发温度每下降10 ℃,OCR下降约3%,而冷凝温度每上升5 ℃,OCR下降约1.5%,冷凝温度对OCR的影响大于蒸发温度;制冷量随着油含量的增加而增加,名义制冷量大于真实制冷量,制冷量衰减率也增加。压缩机转速为3 600 r/min,OCR为5%左右时,制冷量衰减8.0%左右,而OCR为10%左右时,制冷量衰减13.5%左右,但真实制冷量约增加3.5%;压缩机转速增加,等熵效率增大而排气温度降低,当油循环率从5%增加到10%时,压缩机的排气温度降低5 ℃左右;适当提高压缩机转速、润滑油充注量、蒸发温度或降低冷凝温度,有利于提高压缩机的运行性能,确保压缩机的稳定运行。研究可为新能源汽车空调的优化设计提供参考。

, authors=陈建红1, 2, 3, 陶乐仁1, 2, 丁悦1, 王笑菲4, 李兴江1, 陈浩南1, 黄理浩1, 2, authorsList=陈建红, 陶乐仁, 丁悦, 王笑菲, 李兴江, 陈浩南, 黄理浩, authorCompany=null, correspAuthors=黄理浩, authorNote=

陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

, correspAuthorsNote=
黄理浩(1983),博士,副教授,研究方向为电动汽车压缩机测试及开发、沸腾冷凝、高温热泵等,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。
, copyrightStatement=作者向本刊所投稿件一经本刊录用,则该论文的复制权、发行权、信息网络传播权、翻译权、汇编权等权利视为自动转让给本刊。本刊为国内各主要数据库收录期刊,本刊所发表的稿件将同时通过互联网进行网络出版或提供信息服务。, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=dRdx+9x38asJpVXmuZI4rw==, magXml=oiGh1+NskSSRgOQ9RxSGDQ==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=19bt4EMzxnaox6j92roYtg==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=3fAZ+pIL9hbhKoOBLRbDXQ==, mapNumber=null, fund=null)}, authors=[Author(id=1320037389720994314, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=sogt2015perry@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1320037389830046222, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, authorId=1320037389720994314, language=EN, stringName=Jianhong CHEN, firstName=Jianhong, middleName=null, lastName=CHEN, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, 2, 3, address=1Institute of Refrigeration and Cryogenics,University of Shanghai for Science and Technology,Shanghai 200093,China
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3浙江中广电器集团股份有限公司,浙江 丽水 323010, bio={"content":"

陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

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陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

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C,et al.Impact of refrigerant‑oil solubility on an evaporator performances working with R-407C[J].International Journal of Refrigeration,2003,26(3):284-292., articleTitle=null, refAbstract=null), Reference(id=1320037399158178409, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=13, rfOrder=19, authorNames=null, journalName=null, refType=null, unstructuredReference=YOUBI‑IDRISSI M,BONJOUR J,TERRIER M F,et al.Oil presence in an evapoator:experimental validation of a refrigerant/oil mixture enthalpy calculation model[J].International Journal of Refrigeration,2004,27(3):215-224., articleTitle=null, refAbstract=null), Reference(id=1320037399221092970, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, 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1-电动汽车压缩机(EVS36系列);2-油分离器;3-冷凝器;4-高压储液器;5-过冷器;6-气动调节阀;7-量热器;8-蒸发器;9-第二制冷剂;10-电加热器;11-安全阀;12-恒温水箱;13-制冷剂质量流量计;14-过滤器;15-视液镜;16-钢化玻璃管;17-浮子流量计1;18-浮子流量计2;19-功率计1;20-功率计2;T,P分别为监测温度和压力传感器。

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label=Fig.10, caption=Variation of discharge temperature with OCR, figureFileSmall=BdFyBCAalyroLH0e17IySw==, figureFileBig=lwFcNSeE8NzNXFIYN5ytUA==, tableContent=null), ArticleFig(id=1320037396570292815, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, language=CN, label=图10, caption=排气温度随OCR的变化, figureFileSmall=BdFyBCAalyroLH0e17IySw==, figureFileBig=lwFcNSeE8NzNXFIYN5ytUA==, tableContent=null), ArticleFig(id=1320037396662567504, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1320037384884961762, language=EN, label=Tab.1, caption=

Test conditions

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参数蒸发温度/℃冷凝温度/℃转速/(r⋅min-1)
数值0,1045,50,601 000~6 000
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试验工况

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参数蒸发温度/℃冷凝温度/℃转速/(r⋅min-1)
数值0,1045,50,601 000~6 000
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Uncertainty analysis

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项目参数不确定度
直接测量值温度/℃±0.1
压力/MPa±0.2%
制冷剂质量流量/(kg⋅h-1)±0.1%
电加热功率/kW±0.15%
间接测量值制冷剂侧焓差/(kJ⋅kg-1)±0.218
电加热功率Q1/kW±3.75%
制冷量Q0/kW±2.01%
油循环率±0.883%
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不确定分析

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项目参数不确定度
直接测量值温度/℃±0.1
压力/MPa±0.2%
制冷剂质量流量/(kg⋅h-1)±0.1%
电加热功率/kW±0.15%
间接测量值制冷剂侧焓差/(kJ⋅kg-1)±0.218
电加热功率Q1/kW±3.75%
制冷量Q0/kW±2.01%
油循环率±0.883%
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Lubricant charge amount

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序号制冷剂/g油/g油含量百分比/%
11 586399.020.1
21 554351.018.4
31 522303.016.6
41 487270.715.4
51 450195.011.9
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润滑油充注量

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序号制冷剂/g油/g油含量百分比/%
11 586399.020.1
21 554351.018.4
31 522303.016.6
41 487270.715.4
51 450195.011.9
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油循环率对新能源汽车R290压缩机性能的影响
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陈建红 1, 2, 3 , 陶乐仁 1, 2 , 丁悦 1 , 王笑菲 4 , 李兴江 1 , 陈浩南 1 , 黄理浩 1, 2
流体机械 | 试验研究 2025,53(12): 22-28
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流体机械 |试验研究 2025 , 53 (12) : 22 -28
油循环率对新能源汽车R290压缩机性能的影响
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陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

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陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

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陈建红1, 2, 3 , 陶乐仁1, 2, 丁悦1, 王笑菲4, 李兴江1, 陈浩南1, 黄理浩1, 2
作者信息
  • 1上海理工大学 制冷及低温工程研究所,上海 200093
  • 2上海市动力工程多相流动与传热重点实验室,上海 200093
  • 3浙江中广电器集团股份有限公司,浙江 丽水 323010
  • 4上海理工大学 环境与建筑学院,上海 200093
通讯作者:
黄理浩(1983),博士,副教授,研究方向为电动汽车压缩机测试及开发、沸腾冷凝、高温热泵等,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。
作者简介:

陈建红(1984),男,博士研究生,研究方向为电动汽车压缩机开发,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。

Effect of oil circulation rate on the performance of new energy vehicle R290 compressor
Jianhong CHEN1, 2, 3 , Leren TAO1, 2, Yue DING1, Xiaofei WANG4, Xingjiang LI1, Haonan CHEN1, Lihao HUANG1, 2
Affiliations
  • 1Institute of Refrigeration and Cryogenics,University of Shanghai for Science and Technology,Shanghai 200093,China
  • 2Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China
  • 3Zhejiang Zhongguang Electrical Co.,Ltd.,Lishui 323010,China
  • 4School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China
出版时间: 2025-12-31 doi: 10.3969/j.issn.1005-0329.2025.12.003
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为提高新能源汽车空调的能效,减少新能源汽车的制热能耗,以及降低空调制冷剂的全球变暖潜值(GWP)和臭氧消耗潜值(ODP),搭建了一套新能源汽车R290压缩机性能测试系统,试验研究充注量及系统参数对油循环率(OCR)及油循环率对R290压缩机性能的影响。结果表明,系统油的充注量对系统油循环率影响较大,呈指数上升,OCR的最佳运行范围为2%~10%;蒸发温度每下降10 ℃,OCR下降约3%,而冷凝温度每上升5 ℃,OCR下降约1.5%,冷凝温度对OCR的影响大于蒸发温度;制冷量随着油含量的增加而增加,名义制冷量大于真实制冷量,制冷量衰减率也增加。压缩机转速为3 600 r/min,OCR为5%左右时,制冷量衰减8.0%左右,而OCR为10%左右时,制冷量衰减13.5%左右,但真实制冷量约增加3.5%;压缩机转速增加,等熵效率增大而排气温度降低,当油循环率从5%增加到10%时,压缩机的排气温度降低5 ℃左右;适当提高压缩机转速、润滑油充注量、蒸发温度或降低冷凝温度,有利于提高压缩机的运行性能,确保压缩机的稳定运行。研究可为新能源汽车空调的优化设计提供参考。

R290  /  新能源汽车压缩机  /  制冷量  /  等熵效率  /  油循环率

To improve the energy efficiency of new energy vehicle air conditioning systems,educe their heating energy consumption,and lower the global warming potential (GWP) and ozone depletion potential (ODP) of the refrigerant,a performance test system for a new energy vehicle R290 compressor was established.Experimental studies were conducted on the effects of charge amount and system parameters on the oil circulation rate (OCR),and the influence of OCR on the performance of the R290 compressor.The results indicate that the system oil charge amount significantly affects the system OCR,showing an exponential increase.The optimal operating range for OCR is 2% to 10%.For every 10 ℃ decrease in evaporation temperature,the OCR decreases by approximately 3%,while for every 5 ℃ increase in condensation temperature,the OCR decreases by about 1.5%.The condensation temperature has a greater influence on OCR than the evaporation temperature.The cooling capacity increases with higher oil content;the nominal cooling capacity is greater than the actual cooling capacity,and the cooling capacity attenuation rate also increases.At a compressor speed of 3 600 r/min,when the OCR is around 5%,the cooling capacity attenuates by approximately 8.0%,whereas when the OCR is around 10%,the cooling capacity attenuates by about 13.5%,but the actual cooling capacity increases by approximately 3.5%.As the compressor speed increases,the isentropic efficiency increases while the discharge temperature decreases.When the oil circulation rate increases from 5% to 10%,the compressor discharge temperature decreases by about 5 ℃.Appropriately increasing the compressor speed,lubricant charge amount,evaporation temperature,or lowering the condensation temperature is beneficial for improving compressor operating performance and ensuring stable operation.This study provides a reference for the optimal design of new energy vehicle air conditioning systems.

R290  /  new energy vehicle compressor  /  cooling capacity  /  isentropic efficiency  /  oil circulation rate
陈建红, 陶乐仁, 丁悦, 王笑菲, 李兴江, 陈浩南, 黄理浩. 油循环率对新能源汽车R290压缩机性能的影响. 流体机械, 2025 , 53 (12) : 22 -28 . DOI: 10.3969/j.issn.1005-0329.2025.12.003
Jianhong CHEN, Leren TAO, Yue DING, Xiaofei WANG, Xingjiang LI, Haonan CHEN, Lihao HUANG. Effect of oil circulation rate on the performance of new energy vehicle R290 compressor[J]. Fluid Machinery, 2025 , 53 (12) : 22 -28 . DOI: 10.3969/j.issn.1005-0329.2025.12.003
变转速压缩机能够根据需求调整制冷量,改善温度条件,其应用遍布制冷和热泵系统,与启/停式循环相比,该技术具有节能、连续且自动调节、舒适等优点。然而,该技术必须面对的主要问题之一是在压缩机转速范围内,能否满足压缩机的润滑性能要求。随着近些年国家政策,以及国际社会经济发展的“节能减排、绿色环保”的倡导,新能源汽车凭借其低污染优势,在电池及蓄电等关键技术迎来飞速发展,从而带动电动汽车压缩机的应用。大多数压缩机都需要添加润滑油来保证其正常运转,润滑油可以减少压缩机运动部件之间的摩擦,保证压缩机稳定运行并能长期使用[1-3]。此外,润滑油能够在电动汽车涡旋压缩机内部形成油膜,从而起到轴向密封的作用,发挥其转速高、容积效率高的优势,进一步提升压缩机性能[4]。但对于系统的其余部分,润滑油却是污染物。润滑油会改变制冷剂的热力学特性,降低换热器中的传热系数,甚至会堵塞膨胀装置。因此,有必要预估系统中的油循环量。
陈锐等[5]总结了润滑油对制冷系统性能的影响,制冷剂/润滑油的互溶性直接影响压缩机润滑与系统回油特性,进而影响系统性能及可靠性。李连生等[6]研究了冷冻机油对冰箱压缩机性能的影响,表明冷冻机油与制冷剂匹配的重要性。武卫东等[7]分析了压缩机转速对新能源汽车空调系统性能的影响,提出控制压缩机转速有利于提高系统的整体能效。胡青等[8]试验研究了制冷剂含油对汽车空调压缩机性能的影响,当油循环率超过10%时,制冷量的测试误差约为10%,并严重影响压缩机的性能。OSSORIO等[9]研究了R290制冷系统中油循环率对性能的影响,结果表明,系统油循环率随着蒸发温度的降低而升高,随着转速的增加而增加;高转速和低蒸发温度时油循环率高达5%,此时COP的损失达到15%,并且油流量与转速的平方成正比。此外,油循环对R290变频热泵系统性能的影响主要有:润滑油对蒸发器换热系数的影响、制冷剂溶解在润滑油中的影响,以及润滑油对压缩机的影响[10]。THOME[11]指出,制冷剂干度越高,润滑油的局部浓度越大,导致局部润滑油-制冷剂混合液体的黏度显著增加,最终蒸发器换热系数急剧降低。YOUBI‑IDRISSI等[12-14]研究了蒸发器中制冷剂与润滑油的溶解度影响,提出创建制冷剂-润滑剂混合物的压力-焓-干度图的方法,分析润滑油的溶解度对饱和温度及过热度的影响。LOTTIN等[15]的研究表明,系统中受油循环影响最大的是蒸发器,当制冷剂蒸汽的干度超过70%时,其总传热系数随油浓度增加而降低。张斌等[16]研究表明,油循环率在5.5%左右时,制热COP达到峰值,且能有效降低排气温度。邹慧明等[17]研究CO2热泵系统油循环率对压缩机与热泵性能的影响,发现合适的油循环率,有利于提高压缩机的的容积效率及等熵效率,并能有效降低排气温度,提高系统性能。陈志明等[18]通过数学建模和试验研究,分析了含油率对压缩过程、背压腔压力、排气温度、容积效率及压缩机功率等的影响,结果表明,存在最佳的含油率范围,确保压缩机的性能最优,油循环率过大或过小导致压缩机性能下降。
润滑油在新能源汽车电动压缩机系统中的主要作用是在压缩过程中形成油膜,防止气体泄漏,并使气体冷却,从而降低压缩功,提高压缩机效率。然而含油率过大会降低压缩机容积效率,含油率过小又会恶化压缩机润滑和密封效果。新能源汽车空调系统的润滑油需要通过蒸发器回到压缩机,会导致蒸发器内润滑油含量过高而影响蒸发器换热性能,甚至影响系统的制冷量。因此,需要合理控制系统的油循环率。基于此,本文搭建一套新能源汽车R290压缩机性能试验系统对比不同油循环率对压缩机性能的影响。
新能源汽车压缩机制冷系统性能测试装置如图1所示。测试装置由制冷剂循环、第二制冷剂(R245fa)循环及恒温水循环组成。低温低压制冷剂蒸汽由蒸发器出口进入压缩机压缩,成为高温高压蒸汽;然后,进入冷凝器冷凝,冷凝后的液态制冷剂经过储液器;再进入过冷器过冷,过冷的液态制冷剂进入气动调节阀节流,形成低温低压的湿蒸汽;最后,进入蒸发器被加热蒸发,完成一个循环。其中,量热器控制系统的制冷量及蒸发压力;恒温水箱控制系统的冷凝压力及过冷度。表1为测试工况,通过改变压缩机转速、蒸发温度、冷凝温度等测试参数,获得系统制冷量、压缩机功率、COP、压缩机等熵效率、容积效率,以及排气温度等参数的变化规律。
根据表1中试验工况,采用R290制冷剂,并调节压缩机转速获得压缩机吸排气温度、压力和质量流量等参数。试验过程保持量热器和蒸发器的双侧制冷量平衡,即制冷剂侧制冷量与第二制冷剂侧电加热功率的误差在5%以内,表明该测试装置符合热损失要求,R290工质的物性可由REFPROP9.0获得[19]。图2为测试系统的压焓图,状态点1至状态点2为压缩机的实际压缩过程,状态点2s为理想等熵压缩过程,状态点3为冷凝器出口状态,状态点3s为过冷器出口状态。由于从状态点3s到状态点4的过程焓值不变,因此将3s到状态点1的过程看作一个整体,蒸发器出口状态点1由被蒸发的气体制冷剂、润滑油,以及润滑油中溶解的液态制冷剂组成。
蒸发器出口状态点1的流量表达式如下:
mmix=m1,rG+mo+m1,rL
式中,m1,rG为蒸发器出口(压缩机吸气口)气态制冷剂的质量流量,kg/h;m1,rL为蒸发器出口(压缩机吸气口)溶解在油中的液态制冷剂的质量流量,kg/h。
系统的名义制冷量计算公式如下:
Qe=m1,rG(h1-h3s)/3 600
式中,Qe为名义制冷量,kW。
由于蒸发器出口存在过热度,润滑油在蒸发器进口和膨胀阀进口的温度不同,焓值也不同,润滑油内溶解的液体制冷剂的焓值也发生了变化。因此,参与蒸发器的换热量还包括润滑油和液体制冷剂释放的热量。本系统采用量热桶内的电加热平衡换热,因此平衡换热公式如下:
Qe=We+mo3 600(hin,oil-hout,oil)+m1,rL3 600× (hin,rL-hout,rL)
式中,We为量热桶内电加热器的电功率,即系统的实际制冷量,kW;hin,oil,hout,oil为膨胀阀前和蒸发器出口的润滑油的焓值,kJ/kg;hin,rL,hout,rL为膨胀阀前和蒸发器出口的溶解在润滑油中的液态制冷剂焓值,kJ/kg。
压缩机的功率W由功率计2测得,状态点2的焓值可以根据如下公式计算:
h2=3 600W/m1,rG+h1
式中,h2为压缩机出口焓值,kJ/kg;W为压缩机功率,kW;h1为压缩机进口焓值,kJ/kg。
压缩机的容积效率ηv:
ηv=60v1m1,rG×106nVd
式中,ν1为状态点1(压缩机吸气口)的比容,m3/kg;n为压缩机的转速,r/min;Vd为压缩机的理论控制容积,mL/r。
压缩机的等熵效率ηis:
ηis=h2s-h1h2-h1
式中,h2s为压缩机出口理论焓值,kJ/kg;h2为压缩机出口实际焓值,kJ/kg。
通过流量计测试可获得过冷器出口(状态点3s)的质量流量和混合物密度。混合物的质量流量为润滑油和制冷剂液体的总和,如下式所示:
mmix=mo+mrL
式中,mmix为混合物总的质量流量,kg/h;mo为润滑油的质量流量,kg/h;mrL为制冷剂液体的质量流量,kg/h。
则可得系统油循环率ω:
ω=mo mo+mrL
为了确保试验数据的可靠性,对试验系统的热平衡进行校核。以蒸发0 ℃,冷凝60 ℃,制冷剂过热度10 ℃,过冷度5 ℃,变压缩机转速开展装置热平衡校核试验。采用焓差和流量计算被测制冷剂侧制冷量,并通过功率计1获得第二制冷剂侧电加热功率,校核结果如图3所示。
从图可见,两侧制冷量偏差在±5%误差线内,表明试验系统漏热率很小,因此该实验台测量的试验数据准确可靠。
在进行温度、压力、流量等参数测量时,测量仪器本身存在一定的精度,测量出的结果存在一定的偏差,即不确定度。利用这些基本量获得焓值等物性及制冷量、COP等物理量时,必然存在误差的传递。测试装置基本参数及不确定度如表2所示。如下公式为误差传递的基本公式,采用微分法计算不确定度[20]。
z=f(x,y)=xy⇒∂f∂x=y=zx,∂f∂y=x=zy(αz)2=(zx)2(αx)2+(zy)2(αy)2⇒αzz=(αxx)2+(αyy)2
图4示出在不同转速下,系统油循环率随润滑油充注质量比(充注的润滑油和制冷剂的比值,也即油含量百分比)的变化规律。表3列出了润滑油充注量。系统内滞留的油量主要受到惯性力、剪切力、重力等因素的影响,其中惯性力正比于流速的平方[21]。由图可知,润滑油充注量越大,系统的油循环率也越大。制冷系统中受油循环率影响最大的是压缩机的润滑性能和换热器的传热性能。系统油循环率太低导致压缩机无法形成有效润滑,而油循环率太高则会导致系统蒸发器的换热性能大幅下降。系统油循环率的最佳运行范围为2%~10%,在确保压缩机性能的情况下最低可至0.5%。通过对充注量的调整,确保大部分工况的油循环率为2%~10%,开展压缩机性能测试。
转速越大,混合工质的流速越高,混合工质的流量就越大;蒸发温度越低,OCR越小;蒸发温度下降,润滑油的溶解度也下降,而润滑油的黏度增加,导致OCR下降。
图5和图6分别为不同工况下,OCR及质量流量与压缩机转速的变化关系。由图5可知,蒸发温度/冷凝温度为0 ℃/50 ℃,压缩机转速为1 800 r/min时,OCR小于8%,当进一步降低蒸发温度至-20 ℃以下时,OCR接近于0,严重影响新能源电动汽车压缩机的性能。此时,需要提高压缩机转速或增加润滑油的充注量,保持压缩机的正常运行。冷凝温度上升,OCR下降。由图6可知,蒸发温度/冷凝温度分别为0 ℃/45 ℃、0 ℃/50 ℃、10 ℃/45 ℃和10 ℃/50 ℃时,滑油的质量流量增加率分别为13.9%~41.5%,14.8%~47.1%,17.9%~58.2%和20.2%~77.1%,而相应的制冷剂与油的混合物质量流量增加率分别为10.5%~35.5%,10%~34%,15.5%~52.8%和14.3%~59.8%,润滑油的增加率高于混合物的增加率,因此,压缩机转速越大,OCR越高;冷凝温度小幅增加时,压缩机的容积效率变化较小,而压缩机入口状态不变,因此,制冷剂流量变化不大,而润滑油的流量随着冷凝温度的增加而减小,最终导致油循环率下降。
图7示出了不同转速下,压缩机功率随OCR的变化。
从图可以看出,当转速不变时,油含量对压缩机功率的影响较小。本测试工况的OCR范围为4%~12%,润滑油的循环量较小,既不会减少压缩机的有效吸气容积,也能形成有效液膜,实现压缩机密封。当OCR进一步增大,混合物(制冷剂和润滑油)的黏度上升,流动阻力也增加,同时减小压缩机的有效吸气容积,将导致压缩机功耗上升。
图8为不同转速下系统制冷量随油循环率的变化,图中虚线为名义制冷量(混合物总质量流量对应的制冷量),实线为真实制冷量(实际蒸发制冷剂对应的制冷量)。由图可知,制冷量随油含量的增加而逐渐增加,名义制冷量大于真实制冷量,OCR越大,名义制冷量与真实制冷量的差异越大;压缩机转速3 600 r/min,OCR为5%左右时,制冷量衰减8.0%左右,而OCR为10%左右时,制冷量衰减13.5%左右。当油循环率从5%增至10%时,真实制冷量增加3.5%左右。OCR对制冷量的影响主要集中在蒸发器。当润滑油溶解于制冷剂(R290)时,蒸发器内的传热过程主要有3部分:实际蒸发制冷剂对应的制冷量、润滑油降温释放的热量、未蒸发制冷剂(溶解于润滑油中)降温释放的热量。因此,真实制冷量小于名义制冷量。
图9为在不同转速下,压缩机的等熵效率随OCR的变化。由图可知,等熵效率随着OCR的增加而增大。OCR较小时,润滑油可以有效冷却压缩过程且能加强运动部件之间的润滑性能,提高压缩机的工作效率,进而等熵效率上升。随着转速的增加,等熵效率增加的比例越来越小。当油循环率从5%增加到10%时,压缩机的等熵效率增加1.5%左右。因此,过高的OCR增加混合物黏度及流动阻力,影响压缩机的正常运行。
图10为在不同转速下,压缩机的排气温度随OCR的变化(Tsh为吸气过热度)。由图可知,排气温度随OCR的增加而降低,而压缩机转速对排气温度的影响较小。主要是因为部分液体制冷剂溶解在润滑油内,随着压缩过程,溶解的液体制冷剂从润滑油中分离挥发。油含量越大,挥发的制冷剂越多,对压缩过程的冷却效果越好,因此排气温度逐渐下降。当油循环率从5%增加到10%时,压缩机的排气温度降低5 ℃左右,有利于提高压缩机的等熵效率。
综上所述,压缩机吸气回油量适当增加,压缩机的制冷量、性能及等熵效率等均有提升,且耗功变化较小。然而,过大的油循环率会影响压缩机耗功、制冷量衰减、等熵效率等。因此,对不同压缩机系统,需要综合考虑油循环率,平衡蒸发器和压缩机的性能,实现系统的最佳运行。
(1)润滑油的充注量对系统油循环率影响较大,呈指数关系增加。油循环率的大小主要考虑压缩机的润滑和换热器的传热性能,其最佳运行范围为2%~10%。
(2)压缩机转速越大,混合工质的质量流量及油循环率越高,而润滑油的增加率高于混合工质的增加率;蒸发温度越低,OCR越小,蒸发温度每下降10 ℃,OCR下降约3%;冷凝温度上升,OCR下降,冷凝温度每上升5 ℃,OCR下降约1.5%,而蒸发温度降至-20 ℃以下时,其OCR接近于0。
(3)制冷量随油含量的增加而增加,名义制冷量大于真实制冷量,OCR越大,名义制冷量与真实制冷量的差异越大,制冷量衰减率增加,影响蒸发器的正常运行。当压缩机转速为3 600 r/min,OCR为5%左右时,制冷量衰减8.0%左右;而OCR为10%左右时,制冷量衰减13.5%左右。当油循环率从5%增加到10%时,真实制冷量增加3.5%左右。等熵效率随着OCR的增加而增加,随着压缩机转速的增加,等熵效率增加的比例逐渐减小,当油循环率从5%增加到10%时,压缩机的等熵效率增加1.5%左右。排气温度随着油含量的增加而降低,油循环率从5%增加到10%时,压缩机的排气温度可以降低5 ℃左右,有利于提高压缩机的运行性能;OCR范围为4%~12%时,油含量对压缩机功率影响较小。

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2025年第53卷第12期
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doi: 10.3969/j.issn.1005-0329.2025.12.003
  • 接收时间:2025-01-17
  • 首发时间:2026-10-22
  • 出版时间:2025-12-31
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  • 收稿日期:2025-01-17
  • 修回日期:2025-07-09
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    1上海理工大学 制冷及低温工程研究所,上海 200093
    2上海市动力工程多相流动与传热重点实验室,上海 200093
    3浙江中广电器集团股份有限公司,浙江 丽水 323010
    4上海理工大学 环境与建筑学院,上海 200093

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黄理浩(1983),博士,副教授,研究方向为电动汽车压缩机测试及开发、沸腾冷凝、高温热泵等,通信地址:200093上海市杨浦区军工路516号上海理工大学,E-mail:。
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