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Title: Miniature Heat Exchangers for Cryogenic Applications
Researcher: Raveesh Kumar
Guide(s): Chitra Sharma and Sachin Maheshwari
University: Guru Gobind Singh Indraprastha University
Completed Date: 2015
Abstract: Infra Red (I-R) sensors (Mercury Cadmium Telluride) operate most efficiently at newlineliquid Nitrogen temperature as signal to noise ratio is maximum at this temperature. newlineThese are required to be cooled to liquid nitrogen temperature range (~80K) for newlinevarious military and civil applications. The requirement of low temperature of this newlineorder thus necessitates a cooling device, which has to meet the criteria of reliable and newlinerepeatable performance, operational duration, cooling power, space, weight and newlineenvironmental considerations etc. The selection of process cycle (open or close) of the newlinecooling device (mini cooler) generally depends on the specific application and newlineoperational duration. For the application under consideration, a miniature Joule- newlineThomson (J-T) cooler operating in open cycle is best suited despite many demerits newlineviz. higher operating pressure, limited refrigeration capacityand operational time, prone newlineto blockage, logistics etc. J-T coolers have the advantages over famous and most newlineefficient Stirling cycle based coolers on account of nil electrical power requirement, newlineno vibration concerns due to absence of moving parts, ease of operation, negligible newlineweight and bulk and instant cooling. newlineJ T coolers are available in variety of configuration, material, geometry etc, but the newlinescope of the present study is limited to finned tube J T coolers of cylindrical shape. newlineA basic J-T cryogenic cooling system consist of Detector- Dewar -Cooler assembly, newlinehigh pressure gas reservoir, gas cleaner to arrest gas impurities such as moisture, newlinehydrocarbon, CO2, CO etc, electrically operated control valve to facilitate remote newlineoperation and pressure regulator to conserve gas as well as to maintain uniform vapor newlinepressure for temperature stability.
Appears in Departments:University School of Engineering and Technology

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01_coverpage.pdfAttached File24.01 kBAdobe PDFView/Open
02_certificate.pdf33.16 kBAdobe PDFView/Open
03_acknowledgement.pdf10.79 kBAdobe PDFView/Open
04_abstract.pdf25.95 kBAdobe PDFView/Open
05_toc.pdf14.38 kBAdobe PDFView/Open
06_nomenclature.pdf54.09 kBAdobe PDFView/Open
07_publications.pdf35.39 kBAdobe PDFView/Open
08_figures.pdf40.03 kBAdobe PDFView/Open
09_tables.pdf11.34 kBAdobe PDFView/Open
10_chapter_01.pdf234.95 kBAdobe PDFView/Open
11_chapter_02.pdf1.84 MBAdobe PDFView/Open
12_chapter_03.pdf66.2 kBAdobe PDFView/Open
13_chapter_04.pdf623.33 kBAdobe PDFView/Open
14_chapter_05.pdf1.44 MBAdobe PDFView/Open
15_chapter_06.pdf226.98 kBAdobe PDFView/Open
16_chapter_07.pdf537.06 kBAdobe PDFView/Open
17_chapter_08.pdf447.15 kBAdobe PDFView/Open
18_chapter_09.pdf12.88 kBAdobe PDFView/Open
19_references.pdf53.04 kBAdobe PDFView/Open
20_appendix.pdf42.66 kBAdobe PDFView/Open
21_resume.pdf13.07 kBAdobe PDFView/Open

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