Thermal-hydraulic characteristics of a printed circuit board heat exchanger using supercritical carbon dioxide
For the printed circuit heat exchanger(PCHE)in supercritical CO2 Brayton cycle,its complex structure and special physical properties of the working medium will lead to large calculation errors in the lumped parameter method.To improve calculation accuracy,the PCHE thermal-hydraulic calculation program is developed on the ba-sis of the Modelica language.The parameters of PCHE during steady-state operation are analyzed using the subnode method.The results show that the convective heat transfer coefficient of sCO2 in the PCHE channel substantially changes along the flow direction.Compared with the design value,the maximum relative error of the subnode cal-culation program is less than 3%.The calculation accuracy is also greatly improved compared with that of the lumped parameter method.Therefore,the subnode calculation method should be adopted to improve the calculation accuracy.The results can provide a reference for the design and simulation of PCHE in sCO2 Brayton cycle sys-tems.
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