한국해양대학교

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세관에서의 R-22 증발열전달에 관한 실험적 연구

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dc.contributor.author 김진만 -
dc.date.accessioned 2017-02-22T06:23:52Z -
dc.date.available 2017-02-22T06:23:52Z -
dc.date.issued 2001 -
dc.date.submitted 56797-10-27 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002173909 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/9466 -
dc.description.abstract The evaporating heat transfer of R-22 in small tubes has been experimentally studied. The tubes in present work are single square tube and single round tube. The hydraulic diameter of the tubes is 1.67㎜. The experimental apparatus consists of a refrigerant pump, a condenser and a receiver, the small-tube test section, a subcooler of liquid refrigerant, a preheater for control of refrigerant quality at the inlet of test section. The heat flux is generated by heating wire wound on the outer wall of the test section. A set of five thermocouples are embedded at the wall of the test section to measure the wall temperature at five locations. The refrigerant flow rate is measured using a high-pressure rotameter. The pressure drop across the test section is measured using a differential pressure transducer. For refrigerant mass flux of 384 ㎏/㎡s and 570 ㎏/㎡s, the inlet qualities are varied from 0.0 to 0.8 and the wall heat fluxes are varied from 4 ㎾/㎡ to 10 ㎾/㎡. The measured evaporating heat transfer coefficients in the small tubes are 620 ∼ 4760 W/㎡K, which are lower than those observed in the typical large-diameter circular tubes. The evaporating heat transfer coefficient in the square tube shows lower heat transfer coefficient than the round tube. The pressure drop increases with increasing quality. -
dc.description.tableofcontents Abstract 사용기호 표목차 그림목차 제 1 장 서론 = 1 제 2 장 선행연구 고찰 = 3 제 1 절 서론 = 3 제 2 절 증발열전달에 관한 연구 = 4 2.2.1 열전달계수와 상관관계식 = 4 2.2.2 실험연구 = 7 제 3 절 요약 = 14 제 3 장 실험장치 및 실험방법 = 26 제 1 절 실험장치 = 26 3.1.1 냉매회로 = 27 3.1.2 예열기 = 28 3.1.3 시험부 = 28 3.1.4 데이터 취득장치 = 29 제 2 절 실험방법 = 30 제 3 절 데이터 처리 = 31 제 4 장 실험결과 및 고찰 = 39 제 1 절 열유속에 따른 증발열전달계수 = 40 제 2 절 질량속도에 따른 증발열전달계수 = 41 제 3 절 관의 형상에 따른 증발열전달계수 = 41 제 4 절 압력강하 = 42 제 5 장 결론 = 49 참고문헌 = 51 -
dc.publisher 한국해양대학교 대학원 -
dc.title 세관에서의 R-22 증발열전달에 관한 실험적 연구 -
dc.title.alternative An Experimental Study on the Evaporation Heat Transfer of R-22 in Small Tubes -
dc.type Thesis -
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