| Title |
Development of Condensation Heat Transfer Coefficient and Pressure Drop Model Applicable to a Full Range of Reduced Pressures |
| Authors |
Youngchan Kim ; Ajayi ,A. Samuel ; Rin Yun |
| DOI |
https://doi.org/10.6110/KJACR.2023.35.11.557 |
| Keywords |
응축 열전달계수; 열교환기; 높은 환산압력; 친환경냉매; 압력강하 Condensation heat transfer coefficient; Heat exchanger; High reduced pressure; Low GWP refrigerants; Pressure drop |
| Abstract |
Correlations that can predict the in-tube condensation heat transfer coefficients and pressure drop under a full range of reduced pressure conditions were developed. The total numbers of the condensation heat transfer coefficients and the pressure drop utilized for developing correlations were 966 and 687, respectively. The operating ranges of the collected data were within 0.1 - 0.97 of reduced pressure, 75 - 700 kg?m-2s-1 of mass flux, and the inner diameter was within the range of 3.4 - 12.5 mm. Based on the Akers et al.’s(4) model, the present condensation heat transfer correlation was developed by changing the coefficients according to the reduced pressure, and the mean deviation with the experimental data was ±24.6%. In the case of the pressure drop correlation, the mean deviation with the experimental data was ±15.7%, where the reduced pressure was larger than 0.5, and ±29.1% for the full range of reduced pressure. Besides, we developed the Graphical User Interface (GUI) program for estimating the two-phase heat transfer and pressure drop by using Python, which includes the present correlations. |