Analysis of Structural Stress Dynamic Characteristics of Printed Circuit Heat Exchanger in Marine CO2 Power Cycle

The high-pressure conditions of supercritical CO 2 cycle in printed circuit heat exchangers (PCHEs) can lead to core material failure and structural damage. Considering that during the actual sailing of the ship, random factors such as wind, waves and currents affect the working fluid inside the hull, thereby affecting the pressure change of the printed circuit heat exchanger. Therefore, dynamic analysis of its structural stress is necessary. In this paper, the Monte Carlo stochastic finite element method is used, and the pressure of the cold and hot fluid working medium in the PCHEs is applied as a random input variable in the hot and cold runners of the heat exchanger. The traditional PCHEs finite element model is replaced by a response surface model suitable for stochastic processes. The hot and cold runner working medium pressure samples assigned by Latin hypercube sampling are inserted into the response surface model, and the change of the structural stress of the heat exchanger is obtained by calculation. The results show that when the external pressure input signal obeys the normal distribution and corresponding changes, the equivalent structural stress response of the heat exchanger also obeys the normal distribution trend and changes dynamically. The method provided in this paper provides a specific idea for the structural optimization analysis of PCHEs.