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Heat transfer model for moving packed-bed particle-to-sCO2 heat exchangers integrated with metal foams

Journal Article · · Applied Thermal Engineering
 [1];  [2];  [3]
  1. Mississippi State Univ., Mississippi State, MS (United States); Mississippi State University
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Mississippi State Univ., Mississippi State, MS (United States)
Particle-to-supercritical carbon dioxide (sCO2) heat exchangers (HXs) play a vital role in coupling heat transfer fluid (HTF) from high-temperature thermal receivers to power cycle working fluids (WF). Heat transfer enhancement is essential for adopting particle-based moving packed-bed heat exchangers (MPBHXs) in next-generation thermal energy storage (TES) systems, as MPBHXs usually exhibit low particle bed-to-wall heat transfer coefficients. High-porosity metal foams have shown their effectiveness in heat transfer enhancement. Here, this work presents a continuum heat transfer model to demonstrate the heat transfer enhancement in MPBHXs when the particle bed channel is filled with high porosity metal foams compared to open channel MPBHXs. The presence of metal foams increases the effective thermal conductivity in the particle channel and enhances the interstitial heat transfer coefficient between the moving particle bed and the stationary metal foams. The present model considers coupled two-dimensional (2D) heat transfer in the particle channel with metal foams and 1D heat transfer in the sCO2 channel and the dividing wall. The temperature profiles for the particle bed, metal foam, dividing wall, and sCO2 stream, as well as the local heat flux profiles between those, are studied in detail for various foam porosities, from which the particle bed-to-wall heat transfer coefficient, overall heat transfer coefficient, and total heat transfer rate for the MPBHX are determined. The effects of major MPBHX design and operating parameters on the particle bed-to-wall heat transfer coefficient and overall heat exchange capacity are thoroughly examined; thus, the MPBHX performance improvement with metal foams is quantified for each case. The present heat transfer model can provide valuable insights into the metal-foam MPBHX design and optimization, scale-up, and operating parameters selection.
Research Organization:
Mississippi State Univ., Mississippi State, MS (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
Grant/Contract Number:
EE0009377
OSTI ID:
2331501
Alternate ID(s):
OSTI ID: 2222972
Journal Information:
Applied Thermal Engineering, Journal Name: Applied Thermal Engineering Vol. 239; ISSN 1359-4311
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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