NDLI: Advanced Microchannel Heat Exchangers: Structural Analysis

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kuang, G. Balachandran, B. Ohadi, Michael Zhao, Yuan
Copyright Year	2004
Abstract	Since conventional refrigerants have considerable ozone depleting and global warming effects (CFC/HCFC; HFC), Carbon Dioxide (CO2) is being investigated as an alternative refrigerant in vapor compression systems. Due to favorable thermo-physical properties, CO2 when utilized in microchannel heat exchangers (HXs), can result in heat exchangers that have a low weight, a high compaction, and a high heat transfer coefficient. However, CO2 vapor compression systems need to be used in transcritical and supercritical regions, where the pressures range up to 10 MPa (1,400 Psi). Combination of the high pressure requirement, the low stiffness of the microchannel tubes, and the design requirements of compact size and low weight, one will need to carry out a mechanical design and pay attention to system vibratory characteristics such as natural frequencies. To this end, in the present study, a finite-element method (FEM)-based analysis of tube-fin heat exchangers has been carried out to determine guidelines for HX design. This analysis includes fin approximation and solid modeling. Two methods were used to approximate the fins. A dynamic analysis of a full scale HX was also carried out by using a sub-structuring methodology. Predictions from numerical simulations are found to be in good agreement with the results of experimental modal analysis. The present work can serve as a guide for structural design of heat exchangers for a variety of applications.
Sponsorship	Heat Transfer Division
Starting Page	37
Ending Page	42
Page Count	6
File Format	PDF
ISBN	079184711X
DOI	10.1115/IMECE2004-59942
Volume Number	Heat Transfer, Volume 2
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Solid modeling Structural design Compression Approximation Computer simulation Modal analysis Dynamic analysis Carbon dioxide Vapors Fins Heat exchangers Finite element methods Microchannels Design Climate change Compacting Design engineering High pressure (physics) Weight (mass) Stiffness Heat transfer coefficients Refrigerants Structural analysis
Content Type	Text
Resource Type	Article

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