Abstract
In order to improve the accuracy of dynamic simulation under limited time cost, the dynamic analysis program for SCO2 Printed Circuit Heat Exchanger (PCHE) was developed based on the 1-dimensional (1-D) discrete method. The distribution of main thermodynamic parameters and physical properties along the channel are considered, and the calculated results are compared with the 3-D numerical simulation. The results showed that the program can accurately describe the thermal inertia of the heat exchanger, the temperature error is less than 2 %, and the heat transfer power error is only 3.16 %. The thermodynamic parameter field in the channel is complicated, which is attributed to the nonlinear change of the physical properties of SCO2. The heat capacity of PCHE increases linearly with the increase of the hot side inlet temperature, but when the hot side mass flow rate exceeds 125 % of the rated value, the heat capacity increase rate decreases significantly. The temperature and mass flow fluctuation will lead to the mutual transfer between the PCHE structure heat storage and fluid energy. In addition, after the opening of the bypass valve, the PCHE loses nearly 10 % of its heat storage, and the significant deviation of the temperature field will lead to a large thermal shock.
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