建立梯形截面印刷式电路板换热器（PCHE）模型,采用数值模拟的方法,对以熔盐与超临界CO2（SCO2）为工质的PCHE换热器进行研究,并进一步探讨两者的流动与换热特性。结果表明,随着质量流量、温度、压力的增加,SCO2对流换热系数增大,而熔盐换热系数逐渐降低;梯形截面通道因二次流动效应,强化了传热性能,尤其在35°弯折角下效果更显著。与传统半圆形通道相比,梯形截面通道温升提高5.5%,压降降低8.6%。
Abstract
This paper establishes a trapezoidal cross-sectional PCHE model and uses numerical simulation methods to study the PCHE heat exchanger with molten salt and SCO2 as working fluids, further exploring the flow and heat transfer characteristics of both.The results indicate that with the increase in mass flow rate, temperature, and pressure, the convective heat transfer coefficient of SCO2 increases, while the heat transfer coefficient of molten salt gradually decreases. The trapezoidal cross-sectional channel enhances the heat transfer performance due to the secondary flow effect, especially under a 35-degree bending angle, where the effect is more pronounced.Compared to traditional semicircular channels, the temperature rise in trapezoidal cross-section channels increases by 5.5%, and the pressure drop decreased by 8.6%.
关键词
太阳能热发电 /
数值模拟 /
PCHE换热器 /
熔盐储能 /
超临界CO2 /
强化传热
Key words
solar thermal power generation /
numerical simulation /
PCHE heat exchanger /
molten salt energy storage /
supercritical CO2 /
heat transfer enhancement
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参考文献
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基金
甘肃省重点研发计划项目（22YF7GA163）
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