천연냉매를 이용한 냉동장치의 성능 특성에 관한 연구

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Ammonia can be used in the wide temperature range and it has quite good merits as a refrigerant due to a great COP and heat transfer rate, moreover high critical pressure and high critical temperature. But also it has the characteristic of toxicity, inflammability and explosiveness. Therefore, in this study, we will find the most suitable operating condition of Shell & Tube type heat exchanger with ammonia refrigerant. The result of performance characteristic test according to condensing pressure and superheat temperature is as following.
we found that as the condensing pressure was raised at each uniformity degree of superheat condition, the mass flow rate of refrigerant was decreased due to increase of compression ratio and lowering of volume efficiency. At each uniformity condensing pressure condition, Shell & Tube type heat exchanger had slight change in a capacity of evaporator and capacity of evaporator was decreased according as condensing pressure and degree of superheat were getting higher. It revealed that Shell & Tube type heat exchanger was applicable to the ammonia refrigeration system, it seemed possible to have some economic profit and to solve the environment problem.
Alternative Title
A Study on the Performance Characteristics of Refrigeration System using Natural Refrigerant
Alternative Author(s)
Ha, Kyeong-Soo
조선대학교 산업대학원
산업대학원 기계공학과
Awarded Date
2007. 2
Table Of Contents
Nomenclatures = iii
List of tables = iv
List of figures = v
List of photographs = vi
제 1 장 서론 = 1
제 2 장 관련이론 = 4
2.1 냉매의 특성 = 4
2.2 암모니아 냉매의 특성 = 8
2.3 냉동사이클 해석 = 10
2.3.1 이론 냉동사이클 = 10
2.3.2 실제 냉동사이클 = 12
제 3 장 실험장치 = 15
3.1 열교환기의 구조 및 특성 = 19
제 4 장 실험방법 = 21
제 5 장 실험결과 및 고찰 = 25
5.1 냉매 질량유량 = 25
5.2 압축기 흡입압력 = 27
5.3 응축기 냉각수 유량과 출구온도 = 29
5.4 응축기 방열량 = 32
5.5 냉각수 출구온도와 증발기 흡열량 = 34
5.6 소요동력 및 COP = 37
제 6 장 결론 = 40
참고문헌 = 41
조선대학교 산업대학원
하경수. (2006). 천연냉매를 이용한 냉동장치의 성능 특성에 관한 연구
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Engineering > Theses(Master)(산업기술창업대학원)
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