Heat transfer and mechanical design analysis of supercritical gas cooling process of carbon dioxide in microchannels

2006 2006

Other formats: Order a copy

Abstract (summary)

An extensive review of the literature indicates a lack of systematic study of supercritical CO2 gas cooling and no prior work on CO 2/oil mixture in supercritical region, suggesting a lack of fundamental understanding of supercritical gas cooling process and a lack of comprehensive data that would help quantify the performance potential of CO2 microchannel heat exchangers for engineering applications.

This dissertation presents a systematic and comprehensive study on gas cooling heat transfer characteristics of supercritical CO 2 in microchannels. Semi-empirical correlation is developed for predicting heat transfer performance of supercritical CO2 in microchannels. The effect of oil addition on heat transfer performance has been experimentally investigated as well. It is shown that presence of lubricant oil mixed with supercritical CO2 in the heat exchangers can substantially affect heat transfer and pressure drop coefficients.

Because of the outstanding performance of supercritical CO2 and its promising potential as a substitute for current refrigerants, attention has been paid to the design of CO2 microchannel heat exchangers. The extensive review of the literature also indicates no previous study in systematically developing a simulation model for structural design of microchannel heat exchangers. The dissertation extends the research to the mechanical design analysis of microchannel heat exchangers. A finite-element method (FEM) based mechanical design analysis of tube-fin heat exchangers is carried out to develop a simulation model of the heat exchangers. The solid modeling and simulation scheme can be served as a guide for mechanical design of CO2 heat exchangers. Experiments are conducted to validate the developed models as well.

Indexing (details)

Mechanical engineering
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Gas cooling; Heat transfer; Mechanical design; Microchannels; Supercritical carbon dioxide
Heat transfer and mechanical design analysis of supercritical gas cooling process of carbon dioxide in microchannels
Kuang, Guohua
Number of pages
Publication year
Degree date
School code
DAI-B 67/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Ohadi, Michael M.; Balachandran, Balakumar
University of Maryland, College Park
University location
United States -- Maryland
Source type
Dissertations & Theses
Document type
Dissertation/thesis number
ProQuest document ID
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.