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Architecture & Urban Research Institute

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대한설비공학회|설비공학논문집 2012년 9월

논문명 Thermoexcel-E 촉진 표면에서 임계 열유속까지의 풀 비등 열전달계수 / Pool Boiling Heat Transfer Coefficients Up to Critical Heat flux on Thermoexcel-E Enhanced Surface
저자명 이요한 ; 강동규 ; 장철한 ; 정동수
발행사 대한설비공학회
수록사항 설비공학논문집, Vol.24 No.09 (2012-09)
페이지 시작페이지(685) 총페이지(8)
ISSN 1229-6422
주제분류 환경및설비
주제어 핵 비등 ; 열전달계수 ; 임계 열유속 ; Thermoexcel-E 촉진 표면 ; Nucleate pool boiling ; Heat transfer coefficients ; Critical heat flux ; Thermoexcel-E enhanced surface
요약2 In this work, nucleate pool boiling heat transfer coefficients(HTCs) of 5 refrigerants of different vapor pressure are measured on horizontal Thermoexcel-E square surface of 9.53 mm length. Tested refrigerants are R32, R22, R134a, R152a and R245fa. HTCs are taken from 10 kW/m2 to critical heat fluxes for all refrigerant at 7℃. Wall and fluid temperatures are measured directly by thermocouples located underneath the test surface and in the liquid pool. Test results show that critical heat fluxes(CHFs) of Thermoexcel-E enhanced surface are greatly improved as compared to that of a plain surface in all tested refrigerants. CHFs of all refrigerants on the Thermoexcel-E surface are increased up to 100% as compared to that of the plain surface. The improvement of Thermoexcel-E surface in CHF, however, is lower than that of the low fin surface. HTCs on Thermoexcel-E surface increase with heat flux. But after certain heat flux, HTCs began to decrease due to the difficulty in bubble removal caused by the inherent complex nature of this surface. Therefore, at heat fluxes close to the critical one, sudden decrease in HTCs needs to be considered in thermal design with Thermoexcel-E surface.
소장처 대한설비공학회
언어 한국어
DOI http://dx.doi.org/10.6110/KJACR.2012.24.9.685