BEGIN:VCALENDAR VERSION:2.0 PRODID:-//pretalx//modelica.simtek.cc//amfc2026//speaker//9GGRFQ BEGIN:VTIMEZONE TZID:CST BEGIN:STANDARD DTSTART:20000101T000000 RRULE:FREQ=YEARLY;BYMONTH=1 TZNAME:CST TZOFFSETFROM:+0800 TZOFFSETTO:+0800 END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:pretalx-amfc2026-QEWZYQ@modelica.simtek.cc DTSTART;TZID=CST:20260921T153500 DTEND;TZID=CST:20260921T160000 DESCRIPTION:Printed circuit heat exchangers (PCHEs) are key components in s upercritical carbon dioxide (S-CO2) Brayton cycles because of their compac t structure and high heat transfer capability. However\, existing studies have mainly focused on steady-state structural optimization or isolated co mponent analysis\, while the influence of geometric parameters on thermal- hydraulic responses under system-level transient disturbances remains insu fficiently understood. In this study\, a Modelica-based dynamic simulation framework is developed for the system-level analysis of recuperators in a n S-CO2 Brayton cycle. A one-dimensional dynamic PCHE model is established and validated against benchmark data\, with a maximum relative error of 0 .87%. A continuously varying heat sink temperature ranging from 22 ° C to 26 ° C is introduced as a representative offdesign disturbance. The effe cts of channel diameter and channel length on heat transfer coefficient an d pressure drop are investigated under both design reference and transient operating conditions. The results show that smaller channels and longer f low paths enhance heat transfer performance but introduce larger pressure- drop penalties under the design reference condition. Under transient heat sink temperature disturbances\, smalldiameter and long-channel configurati ons exhibit stronger thermal-hydraulic response variations than under stea dystate conditions. These results indicate that parameter trends obtained under steady-state conditions may not directly represent transient thermal -hydraulic behavior under off-design operation. The proposed framework pro vides an efficient approach for preliminary parametric assessment and syst em-level transient analysis of recuperators in S-CO2 Brayton cycles. DTSTAMP:20261004T070732Z LOCATION:Energy (R2002) SUMMARY:Modelica-Based Parametric Analysis of Steady-State and Transient Th ermal-Hydraulic Characteristics of PCHEs in SCO2 Brayton Cycles - Hao Xu\, Yifan Xu\, Yuandong Zhang\, Minjun Peng\, Genglei Xia URL:https://modelica.simtek.cc/amfc2026/talk/QEWZYQ/ END:VEVENT BEGIN:VEVENT UID:pretalx-amfc2026-KUG88X@modelica.simtek.cc DTSTART;TZID=CST:20260921T160000 DTEND;TZID=CST:20260921T162500 DESCRIPTION:To be come DTSTAMP:20261004T070732Z LOCATION:Energy (R2002) SUMMARY:Analysis of Charging and Discharging Control Schemes for S-CO₂ Re actor Systems Based On Modelica - Yuchen Niu\, Yuandong Zhang\, Minjun Pen g\, Genglei Xia\, Chenyang Wang URL:https://modelica.simtek.cc/amfc2026/talk/KUG88X/ END:VEVENT BEGIN:VEVENT UID:pretalx-amfc2026-AGJPFK@modelica.simtek.cc DTSTART;TZID=CST:20260922T110500 DTEND;TZID=CST:20260922T113000 DESCRIPTION:Complex thermodynamic cycle systems play a critical role in adv anced energy applications\, where modeling and simulation constitute a fun damental component of Model-Based Systems Engineering (MBSE). Conventional sequential modular approaches rely heavily on predefined calculation sequ ences and empirical parameter settings\, leading to limited adaptability f or complex cycle topologies with strong coupling\, flow splitting\, and mu ltiple recuperation processes. This study proposes an equation-oriented (E O) modeling framework for thermodynamic cycle systems\, in which the entir e cycle is formulated as a coupled nonlinear algebraic equation system and solved simultaneously. Standardized algebraic component models are establ ished for compressors\, turbines\, and recuperators. An ε–NTU-based hea t exchanger formulation is adopted to avoid the predefined minimum tempera ture difference commonly required in conventional approaches. In addition\ , a bi-level solution strategy combining outerlayer parameter scanning and inner-layer Newton iterations is introduced to handle additional design d egrees of freedom. The proposed framework is validated using supercritical CO₂ simple recuperated and recompression Brayton cycles. Simulation res ults show that the predicted cycle efficiencies agree well with published reference data\, with deviations below 1% under all investigated operating conditions. The framework demonstrates stable convergence behavior and st rong adaptability to complex thermodynamic topologies. The proposed approa ch exhibits acausal\, modular\, and topology-decoupled characteristics con sistent with the declarative modeling philosophy of Modelica. It provides a unified and extensible solution framework for MBSEoriented modeling and simulation of complex thermodynamic energy systems. DTSTAMP:20261004T070732Z LOCATION:FMI & MBSE (R2001) SUMMARY:An Equation-Oriented Modeling Framework for Thermodynamic Cycle Sys tems toward MBSE: A Case Study on Supercritical CO₂ Brayton Cycles - Xin yu Bai\, Genglei Xia\, Tao Zhou\, Guanghui Jiao URL:https://modelica.simtek.cc/amfc2026/talk/AGJPFK/ END:VEVENT END:VCALENDAR