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Performance improvement of heat pump system during cold climate operation for electric vehicle application : 전기자동차용 열펌프시스템의 한냉시 운전성능 향상

DC Field Value Language
dc.contributor.advisor김민수-
dc.contributor.author권춘규-
dc.date.accessioned2017-10-27T16:35:19Z-
dc.date.available2017-10-27T16:35:19Z-
dc.date.issued2017-08-
dc.identifier.other000000145222-
dc.identifier.urihttps://hdl.handle.net/10371/136731-
dc.description학위논문 (박사)-- 서울대학교 대학원 공과대학 기계항공공학부, 2017. 8. 김민수.-
dc.description.abstractBattery-powered electric vehicles(EVs) need an efficient electric heating system for extending the driving mileage. An air-source heat pump system offers an economical alternative for electric vehicles because it consumes less energy than a heating system using Joule heat and it can use the same components as an air conditioning system for cooling. However, its performance degradation is inevitable at very low ambient temperature (cold climate condition). Although EV applies the heat pump system, it needs additional electric heater like high voltage positive temperature coefficient (PTC) heater. It does raise cost a lot, but also makes the vehicle package more complex. Therefore the heating performance improvement of heat pump during cold climate is very important theme. This has been studied a lot in the residential or industrial heat pump, but the cold climate heat pump (CCHP) for EV application is quite limited. In this study, we tried to investigate the cold climate heat pmp for electric vehicle application. The configuration of a vapor injection heat pump, which was well known as a good technology to
overcome this problem in residential heat pump systems, was introduced and the performance characteristics were studied using a scroll compressor geometry-based thermodynamic analysis. And three types of cold climate heat pump (CCHP) were proposed to improve the heat pump performance in cold climate, and were experimentally evaluated for electric vehicle application. These experiments were system-level tests. To validate the real electric vehicle heating performance considering transient performance, in other words, the cabin thermal load change during soak and warm-up process, we installed the cold climate heat pump (CCHP), which was chosen as an best solution by system-level experiences. And vehicle tests were done for the cabin warm-up performance and power consumption comparison, in the real electric vehicle. Finally we could find out the possibilities for developing the cold climate heat pump (CCHP) for future electric vehicle without high cost and high capacity additional heater.		-
dc.description.tableofcontentsChapter 1. Introduction 1
1.1 Background 1
1.2 Literature review 2
1.2.1 EVs with heat pump 2
1.2.2 Heat pump studies for vehicles 2
1.2.3 Challenges of EV heat pump 4
1.3 Objectives and scope 5
Chapter 2. Analysis on the performance of an EV vapor injection heat pump system for cold climate 8
2.1 Introduction 8
2.2 Heat pump system for EV 10
2.2.1 Baseline EV heat pump concept integrated withcooling system. 10
2.2.2 Vapor injection heat pump for EV 15
2.3 Analytical model of vapor injection heat pump system 16
2.3.1 Geometry-based injection scroll compressor model 16
2.3.2 Other components (heat exchanger, expansion valve) model 22
2.3.3 Performance simulation algorithm of the heat pump system 26
2.3.4 Validation 28
2.4 Results and discussions 33
2.4.1 Experimental study of the EV baseline (non-injection) heat pump system 33
2.4.2 Analytic study of the EV vapor injection heat pump system in cold climate condition 39
2.4.3 Analytic study of EV heat pump system optimization in cold condition 50
2.5 Conclusions 55
Chapter 3. Experiments on the performance improvement of heat pump system for electic vehicle during the cold climate operation 57
3.1 Introduction 57
3.2 Heat pump system for EV 61
3.2.1 CCHP 1 : Heat pump with PE waste heat recovery 61
3.2.2 CCHP 2 : Vapor injection heat pump with 1 scroll comp 65
3.2.6 CCHP3 : Heat pump with dual-parallel scroll single motor compressor (DPSC) 66
3.3 Experimental setup 70
3.3.1 Experimental scheme 70
3.3.2 Description of CCHPs configuration for experiment 70
3.3.3 Data reduction 72
3.4 Analysis of the experimental results 74
3.4.1 Performance analysis of the baseline CCHP1 74
3.4.2 Performance analysis of the CCHP2 and CCHP3 82
3.4.3 Discussion 92
3.5 Conclusions 92
Chapter 4. Validation of heating performance with advanced cold climate heat pump in a test vehicle 94
4.1 Introduction 94
4.2 Test vehicle preparation 96
4.2.1 Description of test vehicle 96
4.2.2 Installation of advanced CCHPs 96
4.2.3 Test setup 99
4.3 Vehicle test result in cold climate 104
4.3.1 Heating performance 105
4.3.2 Driving range prediction 109
4.3.3 Windshield glass defrosting test for regulation 111
4.4 Conclusions 115
Chapter 5. Conclusion 117
Appendix 121
References 124
Abstract (Korean) 130		-
dc.formatapplication/pdf-
dc.format.extent2889699 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectheating performance-
dc.subjectheat pump-
dc.subjectelectric vehicle-
dc.subjectvapor injection-
dc.subjectcold climate-
dc.subjectCCHP-
dc.subjectCOP-
dc.subject.ddc621-
dc.titlePerformance improvement of heat pump system during cold climate operation for electric vehicle application-
dc.title.alternative전기자동차용 열펌프시스템의 한냉시 운전성능 향상-
dc.typeThesis-
dc.description.degreeDoctor-
dc.contributor.affiliation공과대학 기계항공공학부-
dc.date.awarded2017-08-
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