Study on Supercritical CO2 Heat Transfer Enhancement in Airfoil PCHE

doi:10.12422/j.issn.1672-6952.2025.04.008

Abstract

Abstract:

In order to break through the bottleneck of heat transfer efficiency of traditional printed circuit heat exchangers, a physical model of airfoil PCHE was established, numerical simulations were conducted to study the convective heat transfer of supercritical CO₂ in the model, the heat conduction principles of supercritical CO₂ under varying mass flow rates and inlet temperatures have been analyzed, and by changing the hydraulic diameter of the channel, further study the heat quantity transfer situation. The results indicate that the thermal exchange performance can be improved by increasing the mass flow rate and the inlet temperature of the cold fluid. At varied hydraulic diameter of the passage, the heat transfer capacity of PCHEs with chord lengths of 6 mm and 8 mm both increase with the increase of Reynolds number. When the Reynolds number is between 19 500 and 26 000, PCHEs with chord lengths of 6 mm and 8 mm have similar heat transfer performance; when the Reynolds number is between 26 000 and 50 000, the comprehensive performance of PCHE with a chord length of 8 mm is 2.55% higher than that of PCHE with a chord length of 6 mm. The research results provide a theoretical basis for the structural design of airfoil PCHE.

Key words: Printed circuit heat exchangers, Supercritical CO₂, Airfoil fins, Convection heat transfer, Hydraulic diameter

摘要：

为突破传统的印刷电路板式换热器（PCHE）传热效率的瓶颈，建立翼型PCHE物理模型，数值模拟了超临界CO₂在该模型中的对流换热，分析了不同质量流量和入口温度下超临界CO₂的换热规律，并通过改变通道的水力直径，进一步研究了水力直径对其换热的影响。结果表明，增大冷流体的质量流量和提高入口温度，均可提高换热性能；改变通道的水力直径后，弦长为6 mm和8 mm的PCHE的换热能力均随着雷诺数的增大而增大，雷诺数为19 500～26 000，弦长为6 mm和8 mm的PCHE均具有相近的换热性能；当雷诺数为26 000～50 000时，弦长为8 mm的PCHE的综合性能比弦长为6 mm的PCHE高2.55%。研究结果为翼型PCHE的结构设计提供了理论依据。

关键词: 印刷电路板式换热器, 超临界CO₂, 翼型翅片, 对流换热, 水力直径

CLC Number:

TK172

Xiaojun LIAN, Li ZHANG, Fei WANG, Gang LI, Yue GAO, Wenquan JIANG. Study on Supercritical CO₂ Heat Transfer Enhancement in Airfoil PCHE[J]. Journal of Liaoning Petrochemical University, 2025, 45(4): 62-69.

连小钧, 张丽, 王菲, 李刚, 高月, 姜文全. 超临界CO₂在翼型PCHE中传热强化研究[J]. 辽宁石油化工大学学报, 2025, 45(4): 62-69.

Figures/Tables 9

Fig.1 Channel and fin model

Fig.2 Schematic diagram of fin arrangement

Table 1 Boundary conditions for the calculation area

区域	边界条件
流体入口	质量流量入口（0.001～0.003 kg/s）
流体出口	压力出口（7.5～8.5 MPa）
上下壁面	周期性
左右壁面	对称
流固区域	耦合
发展段	绝热

Fig.3 Grid independence verification results

Fig.4 Validation results of the numerical model

Fig.5 Effect of cold fluid mass flow on heat transfer of S?CO2 in airfoil PCHE

Fig.6 Effect of cold fluid inlet temperature on heat transfer of S?CO2 in airfoil PCHE

Fig.7 Local velocity distribution of S?CO2 along the flow direction in the flow channel with a chord length of 6 mm and 8 mm

Fig.8 Effect of two channels on heat transfer of S?CO2 in airfoil PCHE

References 22

[1]	刘晨，李启明，邹杨，等. 翼型翅片PCHE的结构参数优化与流动传热的数值模拟［J］. 核技术， 2021， 44（11）： 82⁃90.
	LIU C， LI Q M， ZOU Y， et al. Optimization of structural parameters and thermal⁃hydraulic numerical simulation of printed circuit heat exchanger with airfoil fins［J］. Nuclear Techniques， 2021， 44（11）： 82⁃90.
[2]	易宇楠，倪雨茜，张嘉宁，等. 高熵合金催化剂在电解水制氢和氢燃料电池应用中的研究进展［J］. 低碳化学与化工， 2024， 49（9）： 62⁃71.
	YI Y N， NI Y Q， ZHANG J N， et al. Research progress of high⁃entropy alloy catalysts in water electrolysis for hydrogen production and hydrogen fuel cells［J］. Low⁃Carbon Chemistry and Chemical Engineering， 2024， 49（9）： 62⁃71.
[3]	李占英，王江峰，娄聚伟，等. 印刷电路板换热器在超临界二氧化碳布雷顿循环系统中的动态特性研究［J］. 西安交通大学学报， 2024， 58（12）： 34⁃44.
	LI Z Y， WANG J F， LOU J W， et al. Dynamic characteristic analysis of printed circuit heat exchangers in supercritical carbon dioxide brayton cycle systems［J］. Journal of Xi'an Jiaotong University， 2024， 58（12）： 34⁃44.
[4]	CHENG K Y， ZHOU J Z， HUAI X L， et al. Experimental exergy analysis of a printed circuit heat exchanger for supercritical carbon dioxide brayton cycles［J］. Applied Thermal Engineering， 2021， 192： 116882.
[5]	左成艺，甘露. 超临界二氧化碳布雷顿循环发电技术进展［J］. 能源与节能， 2022（1）： 1⁃6.
	ZUO C Y， GAN L. Progress in supercritical carbon dioxide brayton cycle power generation technology［J］. Energy and Conservation， 2022（1）： 1⁃6.
[6]	李峰，鹿院卫，王彦泉，等. 翼型结构对印刷电路板换热器流动与换热特性影响［J］. 储能科学与技术， 2024， 13（2）： 416⁃424.
	LI F， LU Y W， WANG Y Q， et al. Effect of airfoil structure on flow and heat transfer characteristics of printed circuit heat exchanger［J］. Energy Storage Science and Technology， 2024， 13（2）： 416⁃424.
[7]	董龙飞，刘坤. LNG绕管式换热器壳程两相降膜换热的数值模拟［J］. 石油化工高等学校学报， 2020， 33（5）： 80⁃85.
	DONG L F， LIU K. Numerical simulation of two⁃phase falling film heat transfer at shell side of spiral⁃wound LNG heat exchanger［J］. Journal of Petrochemical Universities， 2020， 33（5）： 80⁃85.
[8]	张准顺，郭强，马贵阳，等. 加装管端隔热层提高换热器安全性的模拟研究［J］. 辽宁石油化工大学学报， 2023， 43（2）： 67⁃71.
	ZHANG Z S， GUO Q， MA G Y， et al. Simulation study on improving the safety of heat exchanger by adding thermal insulation layer at the pipe end［J］. Journal of Liaoning Petrochemical University， 2023， 43（2）： 67⁃71.
[9]	缪洪康，陈玉爽，吕刘帅，等. 板翅式换热器新型翅片换热特性数值模拟研究［J］. 核技术， 2018， 41（10）： 52⁃59.
	MIAO H K， CHEN Y S， LV L S， et al. Numerical simulation study on heat transfer characteristics of new heat exchange fins［J］. Nuclear Techniques， 2018， 41（10）： 52⁃59.
[10]	SHIN J H， YOON S H. Thermal and hydraulic performance of a printed circuit heat exchanger using two⁃phase nitrogen［J］. Applied Thermal Engineering， 2020， 168： 114802.
[11]	邹宏伟，陈永东，韩冰川，等. 直通道印刷电路板式换热器过渡区传热与流动的实验与数值模拟研究［J］. 热力发电， 2023， 52（11）： 140⁃149.
	ZOU H W， CHEN Y D， HAN B C， et al. Studies of heat transfer and flow characteristics of printed circuit heat exchanger under transitional flow［J］. Thermal Power Generation， 2023， 52（11）： 140⁃149.
[12]	TANG L H， YANG B H， PAN J， et al. Thermal performance analysis in a zigzag channel printed circuit heat exchanger under different conditions［J］. Heat Transfer Engineering， 2022， 43（7）： 567⁃583.
[13]	KIM T H， KWON J G， YOON S H， et al. Numerical analysis of air⁃foil shaped fin performance in printed circuit heat exchanger in a supercritical carbon dioxide power cycle［J］. Nuclear Engineering and Design， 2015， 288： 110⁃118.
[14]	LI Y， FU Y， ZHANG J， et al. Investigation of heat transfer performance and enhancement mechanisms of supercritical carbon dioxide in PCHE with fractal airfoil fins［J］. Case Studies in Thermal Engineering， 2024， 60： 104802.
[15]	LIU W T， XU G Q， ZHI H X， et al. Experimental evaluation of hydrothermal performance in airfoil⁃fin PCHE with supercritical pressure hydrocarbon fuel［J］. International Communications in Heat and Mass Transfer， 2024， 159（Part C）： 108279.
[16]	丁梦婷，陈玉爽，傅远. 高温熔盐印刷电路板式换热器的热工水力特性研究［J］. 核技术， 2024， 47（4）： 126⁃136.
	DING M T， CHEN Y S， FU Y. Thermal hydraulic performance analysis of printed circuit heat exchanger based on high temperature molten salt［J］. Nuclear Techniques， 2024， 47（4）： 126⁃136.
[17]	LI Y， KONG F Y， GAO Q， et al. Thermo⁃hydraulic performance of S⁃CO₂ in PCHE with NACA 4822 asymmetric airfoil fins under ocean rolling conditions［J］. International Journal of Heat and Fluid Flow， 2024， 110： 109601.
[18]	时红远，刘华，熊建国，等. 丁胞与翼形肋片相结合的印刷电路板式换热器流动与换热特性的研究［J］. 工程热物理学报， 2019， 40（4）： 857⁃862.
	SHI H Y， LIU H， XIONG J G， et al. Study on flow and heat transfer characteristics of an airfoil printed circuit heat exchanger with dimples［J］. Journal of Engineering Thermophysics， 2019， 40（4）： 857⁃862.
[19]	王抑扬，唐凌虹，辛杰. 横摇工况下PCHE翼型肋通道内流动换热性能研究［J］. 当代化工， 2024， 53（2）： 495⁃499. WANG Y Y， TANG L H， XIN J. Investigation on thermal⁃hydraulic performance in a PCHE with airfoil fins for supercritical LNG near pseudo⁃critical temperature under rolling condition［J］. Contemporary Chemical Industry， 2024， 53（2）： 495⁃499.
[20]	Yoon S H， NO H C， Kang G B. Assessment of straight， zigzag， S⁃shape， and airfoil PCHE for intermediate heat exchangers of HTGRs and SFRs［J］.Nuclear Engineering and Design， 2014， 270： 334⁃343.
[21]	CHU W X， LI X H， MA T， et al. Study on hydraulic and thermal performance of printed circuit heat transfer surface with distributed airfoil fins［J］. Applied Thermal Engineering， 2017， 114： 1309⁃1318.
[22]	DANG C B， HIHARA E. In⁃tube cooling heat transfer of supercritical carbon dioxide. Part 1. Experimental measurement［J］. International Journal of Refrigeration， 2004， 27（7）： 736⁃747.

Study on Supercritical CO₂ Heat Transfer Enhancement in Airfoil PCHE

超临界CO₂在翼型PCHE中传热强化研究

HTML

PDF

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 9

References 22

Related Articles 1

Recommended Articles

Metrics