Abstract
Compact heat exchangers using supercritical fluids such as CO2 are preferred due to their high heat transfer capacity and smaller footprint. Three-dimensional conjugate forced convection heat transfer analysis was performed on several shell-and-tube counter-flow microchannel heat exchangers. Numerical simulations were conducted to test effect of change in mass flow rate, hydraulic diameter and various cross sections on the heat transfer. Increasing mass flow rate improved heat transfer up to a maximum value and then decreased downstream with increasing turbulence. Maximum heat transfer was obtained for the micro channel with the smallest hydraulic diameter. Amongst the cross sections analyzed (circular, square, circular with radial ribs, and square with radial ribs), the most uniform distribution of temperature and maximum heat transfer were obtained for circular cross section with radial ribs. An optimally efficient operation of such a heat exchanger can be attained by considering these factors during multi-objective constrained optimization of geometric parameters and requirements for additive manufacturing of such compact heat exchangers.
Original language | English |
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Title of host publication | Proceedings of the 19th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2020 |
Publisher | IEEE Computer Society |
Pages | 23-29 |
Number of pages | 7 |
ISBN (Electronic) | 9781728197647 |
DOIs | |
State | Published - Jul 2020 |
Event | 19th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2020 - Virtual, Orlando, United States Duration: Jul 21 2020 → Jul 23 2020 |
Publication series
Name | InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITHERM |
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Volume | 2020-July |
ISSN (Print) | 1936-3958 |
Conference
Conference | 19th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2020 |
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Country/Territory | United States |
City | Virtual, Orlando |
Period | 07/21/20 → 07/23/20 |
Funding
Notice: This manuscript has been authored in part by UT-Batelle, LLC under contract DE-AC05-00OR22725 with the United States Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, This work was funded at FIU by the DOE/ORNL contract to TKelvin Corp and supervised by Dr. Adrian Sabau. The effort at UT-Battelle, LLC, was conducted under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy for the project “Novel Recuperator Concepts for Supercritical CO2 based on Additive Manufacturing” funded by the DOE Office of Energy Efficiency and Renewable Energy.
Keywords
- conjugate heat transfer
- cooling process
- heat exchanger
- micro channel
- nuclear application
- pressure drop
- supercritical CO