자동차용 국부냉방시스템 적용을 통한 쾌적성 및 에너지 절약성 향상 연구 = Study on thermal comfort and energy conservatio of local air conditioning system in a vehicle cabin

다국어 초록 (Multilingual Abstract)

In recent years, fuel economy in a vehicle has become an important issue due to environmental concerns and high oil price. An air conditioning system in a vehicle is one of main causes to decrease fuel economy. Therefore, efforts to increase energy efficiency and reduce energy consumption are required. A conventional air conditioning system maintains comfort level temperature for a whole cabin which causes unnecessary energy consumption, while a local air conditioning system cools an occupant zone and the other zones would be maintained at relatively higher temperature. In this study, the performance of the local air conditioning system was evaluated numerically and compared with the conventional air conditioning system. Thermal/fluid analysis using CFD was carried out to visualize temperature and velocity fields. PMV and equivalent temperature based on air temperature, mean radiant temperature, and air velocity were calculated to represent thermal comfort. The results showed comfort variations with different vent air conditions, such as air temperature, total flow rate, and air flow distribution for each vent. In addition, the combined comfort with system performance results showed energy saving for the same comfort.

목차 (Table of Contents)

• Abstract ⅰ
• Contents ⅲ
• List of Figures ⅴ
• List of Tables ⅶ
• Nomenclature ⅷ
• 제 1 장 서 론 1
• 1.1 연구배경 1
• 1.2 연구동향 6
• 1.3 연구목적 및 내용 9
• 제 2 장 연구방법 10
• 2.1 차량 실내 쾌적도 해석 10
• 2.1.1 지배방정식, 난류모델, 복사모델 10
• 2.1.2 해석영역 및 격자생성 13
• 2.1.3 경계조건 15
• 2.1.4 수치해석 모델의 타당성 20
• 2.1.5 열쾌적성 평가 22
• 2.1.6 해석조건 25
• 2.2 시스템 성능 실험 28
• 제 3 장 연구결과 및 고찰 35
• 3.1 공기풍량 분배에 따른 쾌적도 변화 35
• 3.1.1 전방 취출구 풍량분배에 따른 쾌적도 변화 35
• 3.1.2 천장 취출구 추가 시 풍량분배에 따른 쾌적도 변화 41
• 3.2 공기 배출조건에 따른 PMV 변화 및 시스템 성능변화 48
• 3.2.1 풍량 및 온도에 따른 PMV 변화 48
• 3.2.2 시스템 성능변화 51
• 3.2.3 시스템 소비동력 감소방안 54
• 제 4 장 결론 및 향후과제 58
• References 61