Multi-disciplinary Analysis and Design Optimization of Compact, Counterflow Supercritical Carbon Dioxide Based Heat Exchangers

Authors

Janhavi ChitaleFollow

Document Type

Dissertation

Degree

Doctor of Philosophy (PhD)

Major/Program

Mechanical Engineering

First Advisor's Name

George S. Dulikravich

First Advisor's Committee Title

Committee chair

Second Advisor's Name

Dwayne McDaniel

Second Advisor's Committee Title

Committee member

Third Advisor's Name

Bilal El-Zahab

Third Advisor's Committee Title

Committee member

Fourth Advisor's Name

Armando Barreto

Fourth Advisor's Committee Title

Committee member

Fifth Advisor's Name

Paul Cizmas

Fifth Advisor's Committee Title

Committee member

Keywords

Micro channel, Heat exchangers, Optimization, Sensitivity analysis

Date of Defense

11-8-2021

Abstract

ABSTRACT OF THE DISSERTATION

MULTI-DISCIPLINARY ANALYSIS AND DESIGN OPTIMIZATION OF COMPACT, COUNTERFLOW SUPERCRITICAL CARBON DIOXIDE BASED HEAT EXCHANGER

by

Janhavi Chitale

Florida International University, 2021

Miami, Florida

Professor George Dulikravich, Major Professor

Compact microchannel heat exchangers play a crucial role in applications ranging from rocket engines to offshore equipment where high heat extraction is essential in a restricted space and short span of time. One such application in sCO2 based Brayton cycle, that requires heat exchangers operating at extreme temperature (475 K to 854 K) and pressure (9 MPa to 24 MPa) conditions.

An increased number of publications are dealing with the improvement of these heat exchangers. However, only one study has analyzed sCO2 heat transfer at the desired operating conditions.

Additive manufacturing of such metallic concentric tubes radially connected with struts operating at extreme conditions is the only viable method suitable for manufacturing in outer space and extra-terrestrial environments. Themo-elasticity analysis of such structures based on temperature fields obtained from 3D conjugate heat transfer analysis is necessary for ensuring structural integrity.

This dissertation presents a complete framework for performing fully 3D conjugate heat transfer analysis, thermo-elasticity analysis, sensitivity analysis and multi-objective design optimization of sCO2 based compact counter flow heat exchangers.

Conjugate heat transfer analysis involves iteratively solving turbulent flow Navier-Stokes equations and heat conduction in the structure using hybrid computational grid.

A novel sampling method is developed to provide a representative sample of parameters defining geometry and attain higher accuracy of the method of elementary effects-based sensitivity analysis. This resulted in model corroboration and identification of the important model parameters.

A multi-objective optimization based on the use of response surfaces as meta models involves varying eleven parameters defining geometry of the heat exchanger to simultaneously satisfy five objectives in a Pareto-optimal sense. Namely, maximizing total heat transfer, while minimizing the maximum combined stress generated in the solid parts of the heat exchanger, the solid parts volume (weight) and mass flow rates of hot and cold fluids that affect the pumping power. The optimized design shows an 18.5% decrease in the total stress developed in the structure, while maintaining the total heat transfer level and mass flow rates. However, increase in the volume of the structure by 40% was necessary to guarantee structural integrity and satisfy other objectives.

Identifier

FIDC010996

Previously Published In

Chitale, J., Khare, Y., Muñoz-Carpena, R., Dulikravich, G. S., & Martinez, C. (2017, November). An effective parameter screening strategy for high dimensional models. In ASME International Mechanical Engineering Congress and Exposition (Vol. 58424, p. V007T09A017). American Society of Mechanical Engineers.

Reddy, S. R., Chitale, J., & Dulikravich, G. S. (2021). Effects of Atmospheric Uncertainties on Sonic Boom Perceived Level. Journal of Fluids Engineering, 143(4), 041504.

Chitale, J., Abdoli, A., Dulikravich, G. S., Sabau, A. S., & Black, J. B. (2020, July). Conjugate Heat Transfer Analysis of the Supercritical CO2 Based Counter Flow Compact 3D Heat Exchangers. In 2020 19th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm) (pp. 23-29). IEEE.

Recommended Citation

Chitale, Janhavi, "Multi-disciplinary Analysis and Design Optimization of Compact, Counterflow Supercritical Carbon Dioxide Based Heat Exchangers" (2021). FIU Electronic Theses and Dissertations. 5236.
https://digitalcommons.fiu.edu/etd/5236