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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:20261004T070733Z
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/
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