표제지
초록
ABSTRACT
목차
기호 설명 14
1장 서론 18
1.1. 연구배경 18
1.2. 연구동향 21
1.3. 연구목표 24
2장 실험장치 및 실험조건 25
2.1. 실험장치 구성도 25
2.2. 시험부 29
2.3. 실험조건 32
2.4. 데이터 분석 34
2.5. 불확실도 37
3장 결과 39
3.1. R466A의 응축열전달 및 압력강하 39
3.1.1. 질량유속 및 열유속 변화에 따른 R466A 의 응축열전달 및 압력강하 39
3.1.2. 포화온도 변화에 따른 R466A 의 응축열전달 및 압력강하 47
3.2. R466 와 R410A 의 특성 비교분석 50
3.3. Micro-fin tube 와 Smooth tube 의 비교분석 55
3.4. 기존 상관식 비교분석 58
3.5. 상관식 개발 64
4장 결론 69
참고문헌 71
Table 1.1. Physical properties of heat pump refrigerant. 20
Table 2.1. Specifications of experiment measuring devices. 28
Table 2.2. Parameters of micro-fin tube. 30
Table 2.3. Test conditions for R466A and R410A heat transfer characteristics 33
Table 2.4. Uncertainty values of measuring devices and reduced parameters. 38
Table 3.1. Calculated MRD and MARD values for condensation HTC. 62
Table 3.2. Calculated MRD and MARD values for frictional pressure drop. 63
Fig. 2.1. Schematic diagram of the experimental setup. 26
Fig. 2.2. Picture of test section. 30
Fig. 2.3. Cross-sectional view of the micro-fin tube (a) close view (b) entire view. 31
Fig. 3.1. Condensation heat transfer coefficient of R466A in various mass fluxes at (a) Tsat = 35 ℃ and (b) Tsat = 45 ℃.[이미지참조] 42
Fig. 3.2. Frictional pressure drop of R466A in various mass fluxes at (a) Tsat = 35 ℃ and (b) Tsat = 45 ℃.[이미지참조] 44
Fig. 3.3. Effects of heat flux: (a) condensation HTC and (b) frictional pressure drop. 46
Fig. 3.4. Effects of saturation temperature: (a) condensation HTC and (b) frictional pressure drop. 49
Fig. 3.5. Comparison between R466A and R410A on the condensation HTC at (a) Tsat =35 ℃ and (b) Tsat = 45 °C, frictional pressure drop at (c) Tsat = 35 ℃ and (d)...[이미지참조] 54
Fig. 3.6. Comparison between micro-fin tube and smooth tube using R466A on the (a) condensation HTC and (b) FPD. 57
Fig. 3.7. Correlation comparison between experimental and predicted values: (a) condensation heat transfer coefficient and (b) frictional pressure drop. 61
Fig. 3.8. Developed correlation validation of R466A and R410A condensation heat transfer coefficient inside the micro-fin tube and smooth tube. 67
Fig. 3.9. Validation of modified correlation of R466A and R410A from existing studies 68