표제지
Abstract
요약
목차
Nomenclature 15
제1장 서론 16
1.1. 연구배경 16
1.2. 기존의 연구동향 20
1.3. 연구목적 22
제2장 히트펌프의 이론적 배경 24
2.1. 증기 압축 냉동사이클 24
2.2. 히트펌프 28
2.3. 성적계수 29
2.4. 질량유량 30
제3장 실험장치 및 방법 31
3.1. 실험장치 31
3.1.1. 압축기 33
3.1.2. 열교환기 34
3.1.3. 팽창밸브 35
3.2. 실험측정장비 36
3.2.1. 질량유량 측정 36
3.2.2. 온도 측정 38
3.2.3. 압력 측정 38
3.3. 실험방법 38
3.3.1. 냉방 및 빙결 운전 38
3.3.2. 2번 증발기 전환 및 1번 증발기 자연 및 강제제상 운전 39
3.3.3. 2번 증발기 전환 및 1번 증발기 액체 냉매 혼합 40
3.4. R22 Mollier선도 비교 41
제4장 실험결과 및 고찰 44
4.1. 증발기 빙결 시 난방에 미치는 영향 44
4.2. 자연 제상 실험 48
4.3. 팬 작동의 강제 제상 실험 53
4.4. 냉매 혼합 제상 실험 57
4.5. 냉매 혼합 및 팬 작동의 강제 열교환 실험 62
4.6. 전체 실험 결과 비교 66
제5장 결론 69
참고문헌 70
Table 3.1. Compressor specifications (LG QJ264KAE) 33
Table 3.2. Heat exchanger specifications 34
Table 3.3. TUF-2000M Specifications 36
Table 3.4. Temperature and pressure at each state in the actual refrigeration cycle 43
Table 4.1. Variation of Condenser inlet/outlet temperature for the refrigerant mixed defrost method 59
Fig. 1.1. Comparison of electric power consumption 17
Fig. 1.2. Plant diagram of Kia motors Rio heat pump 19
Fig. 1.3. Renault Zoe heat pump heating and defrost method 19
Fig. 2.1. Schematic diagram of the refrigeration cycle 25
Fig. 2.2. P-h diagram of refrigeration cycle 25
Fig. 2.3. Cooling mode and heating mode of heat pump 29
Fig. 3.1. Schematic diagram of test apparatus 32
Fig. 3.2. Photograph of a test apparatus 32
Fig. 3.3. Compressor 33
Fig. 3.4. Heat exchanger 34
Fig. 3.5. Filter drier and capillary tube 35
Fig. 3.6. TUF-2000M Ultrasonic flow meter 36
Fig. 3.7. Temperature measurement 37
Fig. 3.8. Pressure measurement 37
Fig. 3.9. Refrigeration Mode and Freezing 39
Fig. 3.10. Natural defrost method after switching evaporator No. 2 40
Fig. 3.11. Evaporator no. 2 switching and evaporator no. 1 refrigerant mixed defrost method 41
Fig. 3.12. P-h diagram of the actual refrigeration cycle 42
Fig. 3.13. P-h diagram of normal operation and frozen state 43
Fig. 4.1. Variation of temperature after evaporator freezing 45
Fig. 4.2. Variation of mass flow rate after evaporator freezing 46
Fig. 4.3. Variation of heating capacity after evaporator freezing 46
Fig. 4.4. Variation of COP after evaporator freezing 47
Fig. 4.5. Evaporator freezing 47
Fig. 4.6. Variation of temperature in natural defrost method 50
Fig. 4.7. Variation of mass flow rate in natural defrost method 50
Fig. 4.8. Variation of heating capacity in natural defrost method 51
Fig. 4.9. Variation of COP in natural defrost method 51
Fig. 4.10. Variation of P-h diagram in natural defrost method 52
Fig. 4.11. Defrosting the evaporator 52
Fig. 4.12. Variation of temperature for the forced defrost method 55
Fig. 4.13. Variation of mass flow rate for the forced defrost method 55
Fig. 4.14. Variation of Heating capacity for the forced defrost method 56
Fig. 4.15. Variation of COP for the forced defrost method 56
Fig. 4.16. Variation of P-h diagram for the forced defrost method 57
Fig. 4.17. Variation of temperature for the refrigerant mixed defrost method 60
Fig. 4.18. Variation of mass flow rate for the refrigerant mixed defrost method 60
Fig. 4.19. Variation of heating capacity for the refrigerant mixed defrost method 61
Fig. 4.20. Variation of COP for the refrigerant mixed defrost method 61
Fig. 4.21. Variation of P-h diagram for the refrigerant mixed defrost method 62
Fig. 4.22. Variation of temperature for the refrigerant mixed defrost method-forced defrost method 64
Fig. 4.23. Variation of mass flow rate for the refrigerant mixed defrost method-forced defrost method 64
Fig. 4.24. Variation of heating capacity for the refrigerant mixed defrost method-forced defrost method 65
Fig. 4.25. Variation of COP for the refrigerant mixed defrost method-forced defrost method 65
Fig. 4.26. Variation of P-h diagram for the refrigerant mixed defrost method-forced defrost method 66
Fig. 4.27. Variation of evaporator temperature by defrost method 67
Fig. 4.28. Variation of heating capacity by defrost method 68
Fig. 4.29. Variation of COP by defrost method 68