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supercritical CO2 in a modified airfoil fins heat exchanger

已有 1163 次阅读 2023-5-17 20:03 |个人分类:Advances in Energy technology|系统分类:论文交流

The supercritical pressure CO2 (SCO2) Brayton cycle is an efficient and compact power cycle that has promising potential in solar and nuclear power generation systems. The printed circuit heat exchanger (PCHE) is an ideal candidate as a regenerator and pre-cooler in the SCO2 Brayton cycle due to its advantages of high compactness and efficiency. The PCHE with modified airfoil fins has better comprehensive performance than PCHEs with zigzag channels and NACA 0020 airfoil fins and the optimisation of the modified airfoil fins heat exchanger is crucial to the performance improvement of the SCO2 Brayton cycle system. In this work, the local thermal-hydraulic characteristics of SCO2 in the modified airfoil fins channel were numerically investigated under conditions of m = 1.06 – 2.26 g/s, Tin = 328.7 – 388.7 K, and qw = -50 kW/m2 and -100 kW/m2. The dramatic changes in the thermophysical properties of SCO2 lead to uneven distributions of local heat transfer coefficient and local temperature difference along the channel, especially in the region near the pseudocritical point (0.99 < Tb/Tpc < 1.02). Based on the uniformity principle of the temperature difference field (TDF), two non-uniform distributions of fins, including the front-dense and rear-sparse (FDRS) and front-sparse and rear-dense (FSRD) distributions of fins, are proposed. The thermal-hydraulic performance of channels with different distributions of fins was compared under constant heat flux conditions and coupled heat exchange conditions. The results showed that the FDRS and FSRD distributions of fins can enhance heat transfer by improving the distribution uniformity of the temperature difference in the channel. The match of the local dense distribution of fins with the region near the pseudocritical point could obtain better overall thermal performance in the modified airfoil fins heat exchanger. The differences of thermal-hydraulic performance among channels with uniform, FDRS, and FSRD distributions of fins can be explained with the field synergy principle. The FSRD distribution of fins is the optimum scheme among the three distributions of the modified airfoil fins channel because its comprehensive performance is 23 – 29% higher than that of the uniform distribution of fins and 2 – 7.6% higher than that of the FDRS distribution of fins. The present work provides insights into the mechanisms of supercritical CO2 heat transfer characteristics as well as practical guidance on the design and optimisation of relevant components.

 This work has received funding from the National Energy Group Major Pilot Project-China (GJNY2030XDXM-19-10) and the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. [882628].

 This paper (Zengxiao Han, Jiangfeng Guo*, Haiyan Liao, Zhongmei Zhang, Xiulan Huai, Numerical investigation on the thermal-hydraulic performance of supercritical CO2 in a modified airfoil fins heat exchanger, The Journal of Supercritical Fluids 187 (2022) 105643) can be found in: https://doi.org/10.1016/j.supflu.2022.105643 (Elsevier), and https://www.researchgate.net/publication/360869350_Numerical_investigation_on_the_thermal-hydraulic_performance_of_supercritical_CO2_in_a_modified_airfoil_fins_heat_exchanger (ResearchGate)




https://blog.sciencenet.cn/blog-3562592-1388407.html

上一篇:CHT-sCO2 Project - MSCA-IF-2019 Individual Fellowships
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IP: 218.206.227.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [22]婵犲﹥娲滈悵锟�   2013-1-9 01:28
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IP: 90.184.113.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [20]閹兼潙瀚粭妯尖偓鐧告嫹   2013-1-7 08:00
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IP: 72.253.204.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [19]闁惧繒鍋涙稊蹇旂┍閿燂拷   2013-1-7 07:40
About your third question, the answer is either too depressing or too uncertain. If you are interested in where we humans as a race stand in terms of "point of no return," this lecture at the Fall AGU 2012 is the latest (depressing) outlook I have seen:

Union Frontiers of Geophysics Lecture - Professor Sir Bob Watson, CMG, FRS, Chief Scientific Adviser to Defra

http://fallmeeting.agu.org/2012/events/union-frontiers-of-geophysics-lecture-professor-sir-bob-watson-cmg-frs-chief-scientific-adviser-to-defra/
闁搞儳鍋涢ˇ锟�  闁挎冻鎷� Thanks!
2013-1-7 08:061 婵°倗銆嬬槐娆撳炊閻愬樊妲绘俊銈夋?鐎靛矂鏁嶉敓锟� 閻犙嶆嫹 閻犙嶆嫹 +1 |
IP: 72.253.204.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [18]闁惧繒鍋涙稊蹇旂┍閿燂拷   2013-1-7 05:08
I have B.S. and M.S. in meteorology and Ph.D. in physical oceanography. So, in theory I can understand all experts' views on global warming and climate change.

What I have been saying all along is that it is A BIG MISTAKE to use "global warming" or "climate change" to label human's contribution of CO2 emission into the atmosphere (and eventually the world ocean). Temperature changes daily and seasonally, much more than "the warming trend" for the last 100 years. (Does anyone know the answer of how much the global mean surface temperature has warmed up for the last 100 years?) Even for sea level changes, some parts of the world ocean experienced sea level DROP while the rest saw increase.

However, if we look at sea water acidification, there is NO DOUBT that humans are impact the Earth system. Roughly, 1/3 of the CO2 emitted into the atmosphere ends up in the world ocean. I doubt any "anti-global warming" scientists or politicians can dispute this FACT.
闁搞儳鍋涢ˇ锟�  闁挎冻鎷� How about my third question?
2013-1-7 06:561 婵°倗銆嬬槐娆撳炊閻愬樊妲绘俊銈夋?鐎靛矂鏁嶉敓锟� 閻犙嶆嫹 閻犙嶆嫹 +1 |
IP: 90.184.113.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [17]閹兼潙瀚粭妯尖偓鐧告嫹   2013-1-7 02:18
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IP: 221.223.237.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [16]闁告稏鍔岄惃顖滅矈閿燂拷   2013-1-6 22:16
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IP: 121.237.171.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [15]濡炶鍓熷ù锟�   2013-1-6 22:08
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IP: 222.195.239.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [3]缂傚啯顨呴惀澶娒归敓锟�   2013-1-6 17:13
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IP: 75.19.38.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [2]闂傚嫬鐗婇、鍥础閿燂拷   2013-1-6 17:08
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IP: 120.204.251.*   | 閻犙嶆嫹 閻犙嶆嫹 +1 [1]閻犙冪仛閺嬶拷   2013-1-6 17:02
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