Thermohydraulic experiments on a supercritical carbon dioxide–air microtube heat exchanger

Jin, Kaiyuan; Krishna, Akshay Bharadwaj; Wong, Zachary; Ayyaswamy, Portonovo S.; Catton, Ivan; Fisher, Timothy S.

doi:10.1016/j.ijheatmasstransfer.2022.123840

Thermohydraulic experiments on a supercritical carbon dioxide–air microtube heat exchanger

Journal Article · Tue Jan 10 00:00:00 EST 2023 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2022.123840· OSTI ID:2422317

Jin, Kaiyuan ^[1]; ^[2]; ^[2]; Ayyaswamy, Portonovo S. ^[2]; Catton, Ivan ^[2]; ^[2]

Univ. of California, Los Angeles, CA (United States); OSTI
Univ. of California, Los Angeles, CA (United States)

Heat exchangers are critical components in supercritical CO₂ Brayton cycles and provide necessary heat input, recovery, and dissipation. Tubular heat exchangers with unconventionally small tube sizes (tube diameters less than 5 mm) are promising components for supercritical CO₂ cycles and potentially provide excellent structural stability with wide scope of application. This paper provides essential design and fabrication guidelines for a compact shell-and-tube heat exchanger with microtubes (with an inner diameter equal to 1.75 mm). A heat exchanger test rig is used to evaluate the thermohydraulic performance of this heat exchanger with supercritical CO₂ and air as working fluids. Thermohydraulic data are reported for more than forty sets of experiments with varying Reynolds numbers for shell and tube flows. Critical performance metrics are calculated from the data and compared with predictions from a previously described numerical model. The average deviations between the experimental and model results fall within 10% for all critical metrics. This excellent agreement validates the numerical model for supercritical CO₂ heat exchanger optimization and scale-up.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0001131

OSTI ID:: 2422317

Alternate ID(s):: OSTI ID: 1909298

Journal Information:: International Journal of Heat and Mass Transfer, Journal Name: International Journal of Heat and Mass Transfer Journal Issue: C Vol. 203; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Thermohydraulic experiments on a supercritical carbon dioxide–air microtube heat exchanger

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