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핀 형상에 따른 폐열회수용 핀-튜브 열교환기의 성능분석
맹재훈(Jae-Hun Maeng),구병수(Byeong-Soo Koo),전용두(Yong-Du Jun),이금배(Kum-Bae Lee) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.9
As an innovative effort to secure economically viable heat recovery system, various fin shapes for industrial fin-tube heat exchangers have been studied for better performance. In this study, the waste gas heat recovery from four different fin shapes was experimentally performed for heat transfer rate and pressure drop. According to the tested results, the twist and wavy shape fins of rectangular type show the superior performance in terms of Goodness factor and jH/f factor ratio, whereas the circular spiral fin shows the inferior values. Experimental results shows good comparison with the numerical results with a slight discrepancy of 5%, which is quite resonable.
맹재훈(Jae-Hun Maeng),구병수(Byeong-Soo Koo),전용두(Yong-Du Jun),이금배(Kum-Bae Lee) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
Fin tube heat exchangers have been used in many industrial applications. In the waste heat recovery applications, however, the selection of high performance fin shapes are challenged by the adverse operating conditions as high humidity and fouling sources. In this study, the heat recovery performance of different fin shapes (plain, spiral, twist, curved wavy) are experimentally studied in terms of the j-factor and the associated f-factor. For this study the water inlet temperature was set to 60℃(±1) while the gas inlet temperature ranged from 125~140℃ depending on the flow rates that correspond to the Reynolds number(R<SUB>eD, m</SUB>) from 5,313∼8,008. According to the tested results, the wavy fins(6 fins/inch) showed the superior performance in terms of j/f factor, although the twist fins showed the highest j-factor, and the spiral fins(8 fins/inch) showed the highest f-factor. Among the test fins, the spiral fins(8 fin/ inch) showed the lowest values in j/f ratio and the wavy fins showed the highst j/f-factor ratio.
전용두(Yong-Du Jun),남명환(Myong-Hwan Nam),구병수(Byeong-Soo Koo),이금배(Kum-Bae Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
A numerical study has been conducted to investigate the effect of tube arrangement on the heat transfer and the pressure loss for cross flow heat exchangers. By defining a transverse deviation factor, ε<SUB>t</SUB>=l<SUB>T</SUB>/S<SUB>T</SUB>, the flow pattern and the heat transfer characteristics are compared for selected ε<SUB>t</SUB> values of 0.0(in-lined), 0.1, 0.2, 0.3, 0.4, 0.5(staggered) by using a commercial software. Computational domain includes 1 pitch in the transverse direction and 5 pitches in the flow direction with due periodic boundary conditions.
남명환(Myong-Hwan Nam),맹재훈(Jae-Hun Maeng),구병수(Byeong-Soo Koo),전용두(Yong-Du Jun),이금배(Kum-Bae Lee) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.2
As an effort to secure economically viable heat recovery units, innovative fin shapes for industrial boilers are studied for better performance. In the present study a numerical modeling for the analysis of heat exchanger performance is conducted using a commercial software, ANSYS CFX and the results are compared with the experimental data. Out of several candidate fin shapes curved wavy fin is selected for the present study. Both numerical and experimental data are directly compared for heat transfer rate and pressure drop with the assumed constant surface temperature of 60℃. Exhaust gas is obtained from a test apparatus which supplies variable flow rates. The numerical results show reasonable agreements with the experimental data within 10% in terms of both total heat transfer and pressure loss.
남명환(Myong-Hwan Nam),맹재훈(Jae-Hun Maeng),구병수(Byeong-Soo Koo),전용두(Yong-Du Jun),이금배(Kum-Bae Lee) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
As an effort to secure economically viable heat recovery units innovative fin shapes for industrial boilers are studied for better performance. In the present study a numerical modeling for the analysis of heat exchanger performance is conducted using a commercial software, ANSYS CFX and the results are compared against the experimental data. Out of several candidate fin shapes curved wavy fin is selected for the present study. Both numerical and experimental test conditions are tuned for direct comparison but the assumed constant surface temperature of 60℃. Exhaust gas was obtained from a test apparatus which supplies variable flow rates. The numerical results showed reasonable agreements with the experimental data within 10% in terms of both total heat transfer and pressure loss.
남명환(Myong-Hwan Nam),전용두(Yong-Du Jun),구병수(Byeong-Soo Koo),이금배(Kum-Bae Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Innovation for waste heat recovery from industrial boilers pursues higher efficiency along with other post processing technologies. The present study proposes a numerical modeling for the analysis of heat exchanger performance and the resulting desired fin configuration for this purpose. Five different fin configurations are considered for the comparison in terms of the temperature drop, pressure drop and finally goodness factor. Among these, the split fin (6 fins per inch), plain fin, and spiral fin (8 fins per inch) are considered as the baseline configurations, while the twist fin and curved wavy fins served as the improved ones. According to the present numerical study at a specified condition (Tair,in = 160℃, Tcooling water = 40℃), the curved wavy fins may outperform by about 10 percent over the conventional split fins and spiral fins.