Compact Heat Exchangers (CHX) have large number of miniature channels inside their core, which makes them highly thermal efficient and thus, prime utile for Next Generation Nuclear Plants (NGNPs) applications. The fabrication of CHX involves diffusion bonding of etched plates to form CHX block with channeled core. The elevated temperature and transient conditions of NGNP operation may induce excessive strain and creep-fatigue failure in the corners of the channel. The primary objective of this study is to evaluate the design of CHX for application to NGNPs, following the ASME Code Elastic Perfectly Plastic Analysis criteria in Sec III, Div 5. In this study, submodeling technique based thermo-mechanical analysis is conducted to evaluate CHX design. At global level, channeled core is replaced by an elastic orthotropic material core. At local level, Elastic Perfectly Plastic (EPP) analysis is performed following rules in the ASME Draft Code Case for primary load assessment, and N-861 and N-862 cases (HBB-T-1230, Sec III, Div 5). For the latter two cases, the critical sections were assessed against the strain limit and creep-fatigue damage through the EPP at channel level submodel analysis. The outcome of the analysis result for various regions of the CHX is presented and discussed.


Assessment of Compact Heat Exchanger Design Following Elastic Perfectly Plastic Methodology

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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