One-dimensional, transient modeling of a fixed-bed regenerator as a replacement for recuperators in supercritical CO2 power cycles

Reznicek, Evan P.; Hinze, Jacob F.; Rapp, Logan M.; Nellis, Gregory F.; Anderson, Mark H.; Braun, Robert J.

doi:10.1016/j.enconman.2020.112921

One-dimensional, transient modeling of a fixed-bed regenerator as a replacement for recuperators in supercritical CO₂ power cycles

Journal Article · Fri Jun 05 00:00:00 EDT 2020 · Energy Conversion and Management

DOI:https://doi.org/10.1016/j.enconman.2020.112921· OSTI ID:1799154

Reznicek, Evan P. ^[1]; Hinze, Jacob F. ^[2]; Rapp, Logan M. ^[2]; Nellis, Gregory F. ^[2]; Anderson, Mark H. ^[2]; ^[3]

Colorado School of Mines, Golden, CO (United States); OSTI
Univ. of Wisconsin, Madison, WI (United States)
Colorado School of Mines, Golden, CO (United States)

Fixed-bed regenerators may be a low cost alternative to recuperators for supercritical CO₂ power cycles. However, the transient nature of regenerators operating in sCO₂ power cycles has not been previously characterized. This study details a one-dimensional, transient model of a fixed-bed regenerator that captures phenomena such as local fluid properties and heat transfer coefficients, entrained fluid heat capacity, and the effects of conservation of mass during process switching. The model is validated with experimental results of a 10 kWth regenerator. This comparison shows that the model predicts temperature as a function of both time and space exceptionally well. The model predicts effectiveness, heat transfer, and discharge temperatures within 5%, and predicts pressure drop and fluid carryover within 10%. This model could be used in future studies to simulate regenerators within a supercritical CO₂ power cycle.

View Accepted Manuscript (DOE)

Research Organization:: Sarasota County, Inc., FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0001720

OSTI ID:: 1799154

Alternate ID(s):: OSTI ID: 1777004

Journal Information:: Energy Conversion and Management, Journal Name: Energy Conversion and Management Vol. 218; ISSN 0196-8904

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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