표제지
목차
Abstract 7
NOMENCLATURE 11
제1장 서론 12
1.1. 연구 배경 12
1.2. 냉매의 규제 14
1.2.1. 몬트리올 의정서 (Montreal Protocol) 14
1.2.2. 키갈리 개정서(Kigali Amendment) 16
1.2.3. 대기환경보전법 18
1.3. 냉매 회수 현황 19
1.4. 연구 목적 및 개요 21
제2장 이론적 배경 23
2.1. 냉매의 오염 23
2.2. 단단 압축 냉동 사이클 24
2.3. 냉매의 회수 26
2.4. 종래 연구 27
제3장 냉매 오염 실험 28
3.1. 실험 장치 28
3.2. 실험 조건 및 방법 31
3.3. 실험 데이터 정리 34
제4장 실험 결과 및 고찰 36
4.1. 불응축가스의 양에 따른 성능 변화 36
4.2. 수분의 양에 따른 성능 변화 44
4.3. 오일의 양에 따른 성능 변화 47
4.3.1. 과열도를 고정한 상태에서의 성능 변화 47
4.3.2. 과열도 및 증발온도를 고정한 상태에서의 성능 변화 56
4.3.3. 장치 내 오일의 분포 62
4.4. 재생 냉매 성능 실험 66
제5장 결론 70
참고문헌 72
Table 1.1. Regulatory standards and reduction schedules for Group1 countries and Group2 countries 17
Table 1.2. Total refrigerant consumption and recovery by year 20
Table 1.3. Yearly recovery of major refrigerants 20
Table 4.1. Amount of non-condensable gas in the device 36
Table 4.2. Non-condensable gas test results 41
Table 4.3. Amount of moisture in the device 44
Table 4.4. Moisture test results 46
Table 4.5. Amount of oil in the device 47
Table 4.6. Refrigerant Quality Criteria 66
Table 4.7. Recycled refrigerant component analysis results 66
Fig. 1.1. Satellite image of the ozone layer 15
Fig. 1.2. Trends in regulation of substances that destroy the ozone layer and global warming 17
Fig. 2.1. Schematic diagram of single stage refrigeration cycle 25
Fig. 3.1. Drawing of the experimental equipment 29
Fig. 3.2. Manufactured experimental equipment 30
Fig. 3.3. Installed experimental equipment 30
Fig. 3.4. Compressor suction side 33
Fig. 3.5. Oil injector 33
Fig. 4.1. Compressor discharge temperature, pressure and condenser outlet temperature 38
Fig. 4.2. Expansion valve outlet temperature and evaporator inlet/outlet temperature 38
Fig. 4.3. Compressor discharge pressure and temperature 42
Fig. 4.4. Temperature of condensation and evaporation 42
Fig. 4.5. Compressor work and COP 43
Fig. 4.6. Heat transfer rate of condensation and evaporation 43
Fig. 4.7. Compressor discharge pressure and temperature 52
Fig. 4.8. Temperature of condensation and evaporation 52
Fig. 4.9. Pressure drop in condenser and evaporator 53
Fig. 4.10. Mass flow rate of refrigerant 53
Fig. 4.11. Heat transfer rate of condensation and evaporation 54
Fig. 4.12. Condenser outlet temperature and degree of subcooling 54
Fig. 4.13. Compressor work and COP 55
Fig. 4.14. Compressor discharge pressure and temperature 59
Fig. 4.15. Heat transfer rate of condensation and evaporation 59
Fig. 4.16. Mass flow rate of refrigerant 60
Fig. 4.17. Condenser outlet temperature and degree of subcooling 60
Fig. 4.18. Compressor work and COP 61
Fig. 4.19. Oil recovery pipe sight glass when the oil is adequate 64
Fig. 4.20. Oil recovery pipe sight glass in case of excess oil 64
Fig. 4.21. Cross-section of oil separator 65
Fig. 4.22. Compressor discharge pressure and temperature 68
Fig. 4.23. Heat transfer rate of condensation and evaporation 68
Fig. 4.24. Compressor work and COP 69