한국해양대학교

Detailed Information

Metadata Downloads

세관에서의 R-22 증발열전달에 관한 실험적 연구

Title
세관에서의 R-22 증발열전달에 관한 실험적 연구
Alternative Title
An Experimental Study on the Evaporation Heat Transfer of R-22 in Small Tubes
Author(s)
김진만
Publication Year
2001
Publisher
한국해양대학교 대학원
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002173909
http://repository.kmou.ac.kr/handle/2014.oak/9466
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.
Appears in Collections:
냉동공조공학과 > Thesis
Files in This Item:
000002173909.pdf Download

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse