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자동차용 공기조화기의 부분부하 운전특성에 관한 실험적 연구

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Alternative Title
An Experimental Study on Cyclic Performance of the Mobile Air-conditioner
Abstract
Operating characteristic of an air conditioning system for vehicle is dynamic and anomalous. Due to the dynamic behavior of the system, the performance measurement should be taken in account in many different kind of environmental condition with various thermodynamic variables.
One of the driving condition of the system, rotating speed of the compressor for air conditioning is the most important factor consideration that is directly connected to the vehicle engine through clutch and belt. The engine was simulated with 18.5KW class AC motor to drive the compressor.
The study was conducted to get performance information at various driving condition of the vehicle. The experiments was performed in 3 driving mode (Idling, Intermediate and Highway speed) on the same compartment temperature condition and changing inlet air temperature and air flow rate passing through the outdoor heat exchanger. For the cyclic operation of the system in the mobile air conditioning system, the on/off operation of the blower fan of the indoor heat exchanger was conducted to know about the effect of the heat release during the off period of the compressor.
As results, cooling capacity decreased a little in steady state with reducing the outdoor temperature however the power consumption of the system increased significantly. This is due to high specific volume of the circulating refrigerants in the suction line of the compressor by overheating of the refrigerant.
In the experiment for the on and off operation of the blower fan in the compartment heat exchanger, the delay time of the system was reduce more that continuous operation of the fan.
Changing the driving speed of the vehicle yields the variation of the compressor speed. The test for the variation of the compressor was conducted in 3 kinds of operation mode with Idling(900rpm), Intermediate (1800rpm) and Highway(2500rpm) speed. Each mode showed similar level of cooling capacity, however, power consumption show a considerable different. System efficiency is highest at idling-mode.
Author(s)
김종우
Issued Date
2011
Awarded Date
2012. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000005770
Alternative Author(s)
Kim, Jongwoo
Affiliation
제주대학교
Department
대학원 에너지응용시스템학부 기계공학과
Advisor
박윤철
Table Of Contents
List of Figures ⅲ
List of Tables ⅵ
Nomenclature ⅶ
Summary ⅸ
Ⅰ. 서 론 1
1.1 연구배경 1
1.2 연구동향 및 연구목적 2
Ⅱ. 이론해석 4
2.1 부하변동 및 단속운전에 따른 성능변화 4
2.2 냉난방부하계수 및 부분부하계수 8
2.2.1 냉방부하계수 및 난방부하계수 8
2.2.2 부분부하계수 10
2.2.3 일부하계수 12
2.3 단속운전 효율저하계수 13
Ⅲ. 실험장치 및 실험방법 19
3.1. 실험장치 19
3.1.1 환경제어 설비 19
3.1.2 자동차용 공기조화 장치 28
3.1.3 계측장치 35
3.2 실험조건 및 실험방법 42
Ⅳ. 결과 및 고찰 45
4.1 최적냉매량 충전 45
4.2 정상상태 운전 47
4.3 사이클 운전 51
4.4 블로워 홴 작동에 따른 사이클 운전 55
4.5 엔진 회전수 변화에 따른 사이클 운전 60
Ⅴ. 결 론 64
참고문헌 66
Degree
Master
Publisher
제주대학교 대학원
Citation
김종우. (2011). 자동차용 공기조화기의 부분부하 운전특성에 관한 실험적 연구
Appears in Collections:
Faculty of Applied Energy System > Mechanical Enginering
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