표제지
목차
I. 서론 9
II. 기초연구 12
2.1. 열교환기의 일반사항 12
2.2. 기존의 연구 13
III. 실험장치 및 방법 17
3.1. 실험장치 17
3.1.1. 열교환기 시뮬레이터 17
3.1.2. 이중관 열교환기 22
3.1.3. 실험장치의 구성 24
3.2. 실험방법 26
3.2.1. 실험조건 26
3.2.2. 고온유체의 온도와 유량관계 26
IV. 실험결과 및 고찰 28
V. 결론 62
참고문헌 64
Abstract 67
감사의 글 68
Table 3-1. Specification of heat exchanger of double tube type 23
Table 3-2. Experimental conditions 27
Fig. 3-1. Heat exchanger simulator 18
Fig. 3-2. Square light 19
Fig. 3-3. Ampere meter 19
Fig. 3-4. Controller 19
Fig. 3-5. Sensor 20
Fig. 3-6. Flowmeter & others 20
Fig. 3-7. Refrigerator unit 21
Fig. 3-8. Chiller unit 21
Fig. 3-9. Air heater & others 22
Fig. 3-10. Heat exchanger of double tube type 23
Fig. 3-11. Schematic diagram of experimental apparatus(1) 25
Fig. 3-12. Schematic diagram of experimental apparatus(2) 25
Fig. 4-1. Stabilization process of heat exchanger simulator(input value) 32
Fig. 4-2. Stabilization process of heat exchanger simulator(output value) 33
Fig. 4-3. Error rate of data in heat exchanger simulator 34
Fig. 4-4. Temperature change of coolant 35
Fig. 4-5. Pressure drop of air 35
Fig. 4-6. Relations of heat balance 36
Fig. 4-7. Relations between inlet flowrate and outlet temperature in air 36
Fig. 4-8. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 27.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1㎣/h) 41
Fig. 4-9. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 27.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1㎣/h) 42
Fig. 4-10. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 27.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.45㎣/h) 43
Fig. 4-11. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 27.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.45㎣/h) 44
Fig. 4-12. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 52.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1㎣/h) 45
Fig. 4-13. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 52.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1㎣/h) 46
Fig. 4-14. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 52.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.45㎣/h) 47
Fig. 4-15. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 52.5㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.45㎣/h) 48
Fig. 4-16. Pressure drop of air (experimental condition 2) 49
Fig. 4-17. Relations of heat balance (experimental condition 2) 50
Fig. 4-18. Relations between inlet flowrate and outlet temperature in air (experimental condition 2) 51
Fig. 4-19. Input data of heat exchanger simulator(Air inlet temp.: 90℃, Air inlet flowrate: 40㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 54
Fig. 4-20. Output data of heat exchanger simulator(Air inlet temp.: 90℃, Air inlet flowrate: 40㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 55
Fig. 4-21. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 40m /h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 56
Fig. 4-22. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 40㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 57
Fig. 4-23. Input data of heat exchanger simulator(Air inlet temp.: 110℃, Air inlet flowrate: 40㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 58
Fig. 4-24. Output data of heat exchanger simulator(Air inlet temp.: 110℃, Air inlet flowrate: 40㎣/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎣/h) 59
Fig. 4-25. Comparison of outlet temperature when air inlet temperature is changed 60
Fig. 4-26. Comparison of pressure drop when air inlet temperature is changed 60
Fig. 4-27. Comparison of heat balance when air inlet temperature is changed 61