표제지
목차
I. 서론 9
II. 기초연구 11
2.1. 열교환기의 일반사항 11
2.2. CNG 기술의 동향 12
2.3. CNG 가스의 특성 13
2.4. 기존의 연구 15
III. 실험장치 및 방법 18
3.1. 실험장치 18
3.1.1. 열교환기 시뮬레이터 18
3.1.2. 쉘앤튜브 열교환기 23
3.1.3. 실험장치의 구성 25
3.2. 실험방법 27
3.2.1. 실험조건 27
3.2.2. 고온유체의 온도와 유량관계 27
IV. 실험결과 및 고찰 29
V. 결론 59
참고문헌 60
Abstract 62
감사의 글 63
Table 2-1. Chemical property of hydrogen-hydrocarbon gas(1) (0°C, 1atm) 13
Table 2-2. Molar percent of natural gas 14
Table 2-3. Chemical property of natural gas(2) (0°C, 1atm) 15
Table 3-1. Specification of heat exchanger of double tube type 24
Table 3-2. Experimental conditions 28
Fig. 3-1. Heat exchanger simulator 19
Fig. 3-2. Square light 20
Fig. 3-3. Ampere meter 20
Fig. 3-4. Controller 20
Fig. 3-5. Sensor 21
Fig. 3-6. Flowmeter & others 21
Fig. 3-7. Refrigerator unit 22
Fig. 3-8. Chiller unit 22
Fig. 3-9. Air heater & others 23
Fig. 3-10. Heat exchanger of shell & tube type 24
Fig. 3-11. Schematic diagram of experimental apparatus(1) 26
Fig. 3-12. Schematic diagram of experimental apparatus(2) 26
Fig. 4-1. Stabilization process of heat exchanger simulator(input value) 31
Fig. 4-2. Stabilization process of heat exchanger simulator(output value) 32
Fig. 4-3. Error rate of data in heat exchanger simulator 33
Fig. 4-4. 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) 38
Fig. 4-5. Output data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 27.5m /h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1㎥/h) 39
Fig. 4-6. 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) 40
Fig. 4-7. 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) 41
Fig. 4-8. 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) 42
Fig. 4-9. 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) 43
Fig. 4-10. 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) 44
Fig. 4-11. 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) 45
Fig. 4-12. Pressure drop of air (experimental condition 2) 46
Fig. 4-13. Relations of heat balance (experimental condition 2) 47
Fig. 4-14. Relations between inlet flowrate and outlet temperature in air (experimental condition 2) 48
Fig. 4-15. Input data of heat exchanger simulator(Air inlet temp.: 90℃, Air inlet flowrate: 40m /h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎥/h) 51
Fig. 4-16. 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) 52
Fig. 4-17. Input data of heat exchanger simulator(Air inlet temp.: 100℃, Air inlet flowrate: 40㎥/h, Coolant inlet temp.: 20℃, Coolant inlet flowrate: 1.9㎥/h) 53
Fig. 4-18. 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) 54
Fig. 4-19. 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) 55
Fig. 4-20. 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) 56
Fig. 4-21. Comparison of outlet temperature when air inlet temperature is changed 57
Fig. 4-22. Comparison of pressure drop when air inlet temperature is changed 57
Fig. 4-23. Comparison of heat balance when air inlet temperature is changed 58