| Title |
Experimental Studies on Thermal-Fluidic Characteristics of Carbon Dioxide During Heating Process in the Near-Critical Region for Single Channel |
| Authors |
Hyunwoo Choi ; Jeong-Heon Shin ; Jun Seok Choi ; Seok Ho Yoon |
| DOI |
https://doi.org/10.6110/KJACR.2017.29.8.408 |
| Keywords |
인쇄기판형 열교환기 ; 마이크로채널 ; 열전달계수 ; 압력강하 ; 초임계 이산화탄소 Printed circuit heat exchanger ; Microchannel ; Heat transfer coefficient ; Pressure drop ; Supercritical carbon dioxide |
| Abstract |
Supercritical carbon dioxide (sCO2) power system is emerging technology because of its high cycle efficiency and compactness. Meanwhile, PCHE (Printed Circuit Heat Exchanger) is gaining attention in sCO2 power system technology because PCHE with high pressure-resistance and larger heat transfer surface per unit volume is fundamentally needed. Thermo-fluidic characteristics of sCO2 in the micro channel of PCHE should be investigated. In this study, heat transfer characteristics of sCO2 of various inlet conditions and cross-sectional shapes of single micro channel were investigated experimentally. Experiment was conducted at supercritical state of higher than critical temperature and pressure. Test sections were made of copper and hydraulic diameter was 1 mm. Convective heat transfer coefficients were measured according to each interval of the channel and pressure drop was also measured. Convective heat transfer coefficients from experimental data were compared with existing correlation. In this study, using measured data, a new empirical correlation to predict near critical region heat transfer coefficient is developed and suggested. Test results of single channel will be used for design of PCHE. |