Date of Award
Fall 2009
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical & Aerospace Engineering
Program/Concentration
Mechanical Engineering
Committee Director
Sushi! K. Chaturvedi
Committee Director
Venkatarao Ganni
Committee Member
Arthur C. Taylor III
Call Number for Print
Special Collections; LD4331.E56 Y85 2009
Abstract
There is a demand for reliable and cost-effective small-scale helium liquefiers and refrigerators with higher capacity and efficiency in universities, government, and industry. Among the most common of these small-scale cryogenic systems is the Linde model 1600 helium liquefier and refrigerator.
The goal of this study is to increase the capacity of the model 1600. To achieve this goal, this study focuses on reducing the irreversibilities of the model 1600's fin-tube heat exchangers (FTHXs). Modification of fin-tube passes is the most practical means by which to reduce FTHX irreversibilities. Expressions relating FTHX geometry to FTHX irreversibilities identify model 1600 heat exchangers which benefit from pass modifications. A process model of the model 1600 is developed and baselines are established by matching it to known operating conditions. With each FTHX modification, the process model is optimized to achieve higher capacity.
In its application, the optimization method developed in this study results in improvements to the overall capacity and efficiency of the model 1600. Capacity is shown to increase by 31.43 percent for liquefaction mode and 12.44 percent for refrigeration mode. The percent of Carnot efficiency is shown to increase by 24.35 percent for liquefaction mode and 7 .76 percent for refrigeration mode.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
DOI
10.25777/xxac-qc79
Recommended Citation
Yuksek, Errol L..
"Capacity Improvement of a Small-Scale Cryogenic System Using Exergy Analysis"
(2009). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/xxac-qc79
https://digitalcommons.odu.edu/mae_etds/774
