CHOSUN

R134a와 R1234yf를 적용한 상용탑차용 냉동시스템의 성능비교 연구

Metadata Downloads
Author(s)
강오석
Issued Date
2016
Keyword
열 및 유체공학 냉동공학
Abstract
Number of cars is increased gradually due to development of automobile industry and improvements of living level. To satisfy the demand of consumers and to solve the environment problems such global warming and depletion of the ozone layer, the development competition of eco-friendly future cars such as an electric car and hydrogen fuel cell vehicle is actively studied. Besides, shopping and eating out culture have developed rapidly and purchase of goods through On-line have increased, therefore, the demand for food of frozen and refrigeration have also increased.
Recently, R134a refrigerant has been used mainly as the refrigerant of automobile air conditioning system. However, it is classified as global warming gas by the 1997 Kyoto Protocol. To substitute the R134a refrigerant, many companies tried to develop the alternative refrigerant like R1234yf refrigerant. GWP of R1234yf refrigerant is just 4 which is lower than GWP of R134a refrigerant(GWP=1430). In addition, ODP of R1234yf is 0.
In this study, the performance characteristics of refrigeration system using R134a and R1234yf in a refrigeration truck was investigated and compared. As a result, the optimal charging amounts of R134a and R1234yf system were 1.4 kg and 1.3 kg, respectively. Charging amounts of R134a system were 7.2% more than that of R1234yf system. Under optimal charging amounts, COP and cooling capacity of R134a system were 2.63 and 4.23 kW, and those of R1234yf system were 2.49 and 3.93 kW, respectively. To find optimal EEV opening, EEV opening of R134a system was varied. The optimal EEV openings of R134a and R1234yf system was 60% and 50%, respectively, and COP of R134a and R1234yf system at this EEV opening was 2.69 and 2.49, respectively. When the outdoor air temperature increased from 25℃ to 35℃, the power consumption of R134a and R1234yf system increased by 8.2% and 5.5%. while cooling capacity of R134a and R1234yf system decreased by 7.9% and 6.7%, respectively. Accordingly, COP of R134a and R1234yf system decreased by 15% and 11.6%, respectively. When the indoor air temperature increased from 5℃ to 9℃, cooling capacity of R134a and R1234yf system increased by 13.1% and 6.8%, while the power consumption of R134a and R1234yf system decreased by 2.9% and 1.5%, respectively. Accordingly, COP of R134a and R1234yf system increased by 16.5% and 7.7%, respectively. As the compressor rotating speed increased from 1000 rpm to 2000 rpm, cooling capacity of R134a and R1234yf system increased by 21.7% and 18.9%, respectively, resulting in 37.5% and 35.9% decrease COP for each system.
Overall, the performance of R1234yf system was lower than that of R134a system. Under various operating conditions, the performance variation rate of R134a system was higher than that of R1234yf system. Through the results of this study, it can provide the basic information on the performance of a refrigeration system in a refrigeration truck by application of alternative refrigerant.
Alternative Title
Comparison study on the performance of refrigeration system in a refrigeration truck using R134a and R1234yf
Alternative Author(s)
Kang, Oh Seok
Affiliation
조선대학교 산업기술융합대학원
Department
산업기술융합대학원 융합자동차공학과
Advisor
조홍현
Awarded Date
2017. 2
Table Of Contents
Contents

Contents ⅰ
List of Figures ⅴ
List of Tables ⅶ
Nomenclature ⅷ
ABSTRACT ⅹ

제 1 장 서 론 1
제 1 절 연구배경 1
1.1.1 자동차 공조시스템 냉매의 변천사 1
1.1.2 오존층파괴 및 기후변화 5
제 2 절 자동차 공조시스템의 대체냉매 연구동향 11
1.2.1 국내 자동차 공조시스템의 대체냉매 연구동향 11
1.2.2 국외 자동차 공조시스템의 대체냉매 연구동향 14
1.2.3 상용탑차 냉동시스템의 연구동향 15
제 3 절 연구 목적 17

제 2 장 자동차 공조시스템 관련이론 19
제 1 절 증기압축 냉동시스템 19
제 2 절 R134a, R1234yf 냉매의 특성 20
2.2.1 R134a 냉매의 특성 20
2.2.2 R1234yf 냉매의 특성 21
제 3 절 R134a, R1234yf 냉매의 열역학적 물성치 비교 22
2.3.1 증기압 (Vapor Pressure) 25
2.3.2 증발잠열 (Latent Heat of Vaporization) 26
2.3.3 밀도 (Density) 27
2.3.4 열전도율 (Thermal Conductivity) 28
제 4 절 기타사항 30
2.4.1 윤활유의 작용 30
2.4.2 냉매의 부품적합성 32
2.4.3 냉매의 화재위험성 34

제 3 장 실험장치, 실험방법 및 조건 35
제 1 절 실험장치 35
3.1.1 상용탑차 냉동시스템 실험장치 35
3.1.2 온습도 제어장치 39
3.1.3 풍량측정장치 40
가. 풍량측정 40
나. Calorimeter의 원리 40
3.1.4 상용탑차 냉동시스템의 구성 43
가. 압축기(Compressor) 43
나. 응축기(Condenser) 44
다. 전자 팽창밸브(Electronic Expansion Valve) 45
라. 증발기(Evaporator) 46

제 2 절 측정 장치 및 데이터 수집․처리장치 47
3.2.1 측정 장치 47
가. 압력 측정 47
나. 온도 측정 48
다. 유량 측정 49
라. 압축기 소비동력 측정 50
마. 인버터 51
3.2.2 데이터취득 및 처리장치 52
제 3 절 실험방법 및 실험조건 53
3.3.1 실험방법 53
3.3.2 실험조건 54
3.3.3 냉동용량의 계산 55

제 4 장 실험결과 및 고찰 56
제 1 절 R134a, R1234yf냉매를 적용한 냉동시스템 성능실험 결과 및 고찰 56
4.1.1 냉매충전량 변화에 따른 성능실험 결과 및 고찰 56
4.1.2 EEV 개도 변화에 따른 성능실험 결과 및 고찰 58
4.1.3 냉동탑차 실외온도 변화에 따른 성능실험 결과 및 고찰 60
4.1.4 냉동탑차 실내온도 변화에 따른 성능실험 결과 및 고찰 62
4.1.5 압축기 회전속도 변화에 따른 성능실험 결과 및 고찰 64

제 5 장 결 론 66

Reference 69
Degree
Master
Publisher
조선대학교, 산업기술융합대학원
Citation
강오석. (2016). R134a와 R1234yf를 적용한 상용탑차용 냉동시스템의 성능비교 연구
Type
Dissertation
URI
https://oak.chosun.ac.kr/handle/2020.oak/1955
http://chosun.dcollection.net/common/orgView/200000265906
Appears in Collections:
Engineering > Theses(Master)(산업기술창업대학원)
Authorize & License
  • AuthorizeOpen
Files in This Item:

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.