دانلود مقاله ISI انگلیسی شماره 153842
ترجمه فارسی عنوان مقاله

توپولوژی جریان سیستم های انتقال حرارت در شرایط فوق بحرانی برای تجزیه و تحلیل عملکرد و بهینه سازی

عنوان انگلیسی
The power flow topology of heat transfer systems at supercritical conditions for performance analysis and optimization
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
153842 2018 11 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : International Journal of Heat and Mass Transfer, Volume 118, March 2018, Pages 316-326

ترجمه کلمات کلیدی
سیستم انتقال حرارت، مایع فوق بحرانی، توپولوژی جریان قدرت، شارژ جرم بهینه سازی عملکرد،
کلمات کلیدی انگلیسی
Heat transfer system; Supercritical fluid; Power flow topology; Mass charge; Performance optimization;
پیش نمایش مقاله
پیش نمایش مقاله  توپولوژی جریان سیستم های انتقال حرارت در شرایط فوق بحرانی برای تجزیه و تحلیل عملکرد و بهینه سازی

چکیده انگلیسی

Heat transfer processes with supercritical fluids are more complex than those with ordinary fluids due to the drastic variation of physical properties. In this study, with consideration of the changes of specific heat and heat transfer coefficient, the power flow topology of a multi-loop heat exchanger network is developed to investigate heat transfer processes at supercritical conditions. Simulation of a cooling process with supercritical CO2 validates the newly proposed method, where the maximum relative error of heat transfer rate is −2.72%. Meanwhile, optimization of a heat exchanger network discovers several design criteria for the optimal heat transfer performance. For instance, the mass charge of CO2 in the heat exchanger network influences its supercritical heat transfer performance significantly, which has the optimal value. Furthermore, the optimal mass charge nearly keeps constant with the heat transfer rate and the temperature boundaries, and increases linearly with the rise of the total heat transfer area, which indicates the optimal average density keeps constant. Substituting this constant density into the state equation of CO2 establishes the matching relation of the temperature range and the pressure for the optimal heat transfer performance.