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<p>In this study, the optimal channel size of a printed circuit heat exchanger (PCHE) with a subcritical nitrogen gas cycle is determined through thermo-mechanical analyses. The objective is to maximize the structural integrity of the PCHE while maintaining its thermal performance. To achieve this, finite element analyses (FEAs) are conducted by varying the channel size of the PCHE, while constraining the thermal performance to a set value. The boundary conditions and transport properties required for the FEAs are derived through a two-step calculation process. First, the logarithmic mean temperature difference (LMTD) method, which assumes a simple one-dimensional shape and requires low computational cost, is applied. Second, thermal analyses through FEAs are performed to refine the LMTD results. Using these refined results, thermo-mechanical FEAs are carried out. Based on the stresses obtained from these analyses, the optimal channel size is obtained, ensuring both structural integrity and thermal performance.</p>

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Thermo-mechanical analysis and channel size optimization of printed circuit heat exchanger with subcritical gas N2 cycle

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Seunghun Lee,
  • Minchang Kim,
  • Jong-Rae Cho,
  • Moonhong Kim

摘要

In this study, the optimal channel size of a printed circuit heat exchanger (PCHE) with a subcritical nitrogen gas cycle is determined through thermo-mechanical analyses. The objective is to maximize the structural integrity of the PCHE while maintaining its thermal performance. To achieve this, finite element analyses (FEAs) are conducted by varying the channel size of the PCHE, while constraining the thermal performance to a set value. The boundary conditions and transport properties required for the FEAs are derived through a two-step calculation process. First, the logarithmic mean temperature difference (LMTD) method, which assumes a simple one-dimensional shape and requires low computational cost, is applied. Second, thermal analyses through FEAs are performed to refine the LMTD results. Using these refined results, thermo-mechanical FEAs are carried out. Based on the stresses obtained from these analyses, the optimal channel size is obtained, ensuring both structural integrity and thermal performance.