자동차용 에어컨 응축기의 설계기술 개발 = Development of design technique for automotive consenser

다국어 초록 (Multilingual Abstract)

The present work presents condensation heat transfer and pressure drop data for the flow of R-12 in flat extruded aluminum tubes with small hydraulic diameters. The tube outside dimensions are 18mm(width)× l.7mm(height). Three types of internal geometry with the same outside dimensions are tested : sample 1 (7 tube holes), sample 2 (13 tube holes) and sample 3 (7 tube holes, micro-fin). The overall heat transfer coefficient is obtained for air-to-refrigerant heat transfer, and the Wilson plot method is used to determine the heat transfer coefficient for refrigerant flow. The sample 2 and sample 3 show significantly higher performance than sample 1. The heat transfer rates for the sample 2 and sample 3 are 9% and 12% higher, respectively, than sample 1. The friction factors for the sample 2 and sample 3 are 11.9% and 2.4% higher, respectively, than sample 1.

목차 (Table of Contents)

• 1. 서론
• 1.1 연구배경
• 1.2 기존연구
• 2. 실험장치 및 실험방법
• 2.1 다채녈 납작관의 설계 및 제작
• 2.2 실험장치
• 2.3 실험방법
• 3. 이론해석
• 3.1 열전달계수의 계산
• 3.2 마찰계수 계산
• 3.3 다채널 납작관에서의 열유동특성 고찰
• 3.4 다채널 납작관에서의 압력강하 특성 고찰
• 4. 결과 및 고찰
• 5. 결론
• 참고문헌