Дисертації з теми "Pulse Tube Refrigerator"
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Schor, Alisha R. (Alisha Robin). "Design of a single orifice pulse tube refrigerator through the development of a first-order model." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40482.
Повний текст джерела"June 2007."
Includes bibliographical references (p. 41).
A first order model for the behavior of a linear orifice pulse tube refrigerator (OPTR) was developed as a design tool for construction of actual OPTRs. The model predicts cooling power as well as the pressure/volume relationships for various segments of the refrigerator with minimal computational requirements. The first portion of this document describes the development of this model and its simplifications relative to higher-order numerical models. The second portion of this document details a physical implementation of the pulse tube and compares its performance to the predicted performance of the model. It was found that the model accurately predicted qualitative behavior and trends of the orifice pulse tube refrigerator, but that the predicted temperature difference was approximately five times higher than the measured temperature difference. It is believed that the model can be improved with provisions for flow choking as well as warnings for behavior outside of the accepted operating conditions.
by Alisha R. Schor.
S.B.
Emery, Nick. "Cryogenic refrigeration using an acoustic stirling expander." Thesis, University of Canterbury. Mechanical Engineering, 2011. http://hdl.handle.net/10092/5306.
Повний текст джерелаSultan, Ahmad. "Dynamique dans les fluides quantiques : Etude des excitations collectives dans un liquide de Fermi 2D." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00768021.
Повний текст джерелаConrad, Theodore Judson. "Miniaturized pulse tube refrigerators." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41108.
Повний текст джерелаWatanabe, Atsuhiko. "Studies of superfluid stirling and pulse tube refrigeration." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36051.
Повний текст джерелаDavid-Calvet, Marc. "Refrigeration par tube a gaz pulse : etude theorique et experimentale." Paris 6, 1992. http://www.theses.fr/1992PA066110.
Повний текст джерела(egale a celle evacuee a la source chaude) est seulement de 1. 2 alors que ceux des modeles precedents sont compris entre 3 et 5#|#1#,#2#|. Le modele etudie est valable pour n'importe quelle variation temporelle de pression. Pour une forme de pression donnee (mesuree dans le tube,est exprimee avec un minimum de parametres independants, permettant ainsi une optimisation ulterieure du systeme. Les mesures de temperature et de vitesse le long du tube sont en bon accord avec les calculs numeriques. Avec un t. G. P. Ameliore dit hybride, nous obtenons une efficacite comparable a celle d'un cryogenerateur du commerce type gifford-mac mahon. La temperature limite de notre t. G. P. A double entree est de 32 k pour une puissance de 8w a 77k
Mulcahey, Thomas Ian. "Convective instability of oscillatory flow in pulse tube cryocoolers due to asymmetric gravitational body force." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51808.
Повний текст джерелаWilson, Kyle B. "The use of Sage simulation software in the design and testing of Sunpower's pulse tube cryocooler." Ohio : Ohio University, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1126908659.
Повний текст джерелаClearman, William M. "Measurement and correlation of directional permeability and Forchheimer's inertial coefficient of micro porous structures used in pulse tube cryocoolers." Thesis, Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07092007-111541/.
Повний текст джерелаKirkconnell, Carl S., Committee Member ; Ghiaasiaan, S. Mostafa, Committee Chair ; Desai, Prateen V., Committee Member ; Jeter, Sheldon M., Committee Member.
Saez, Sébastien. "Magnétomètres - Gradiomètres à capteurs supraconducteurs à haute température critique; Mise en oeuvre dans un cryogénérateur portable à tube pulsé." Phd thesis, Université de Caen, 2000. http://tel.archives-ouvertes.fr/tel-00011006.
Повний текст джерелаCha, Jeesung Jeff. "Hydrodynamic Parameters of Micro Porous Media for Steady and Oscillatory Flow: Application to Cryocooler Regenerators." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07092007-194225/.
Повний текст джерелаJeremy P. Harvey, Committee Member ; Carl S. Kirkconnell, Committee Member ; Kurt D. Pennell, Committee Member ; S. Mostafa Ghiaasiaan, Committee Chair ; Prateen V. Desai, Committee Member ; Sheldon M. Jeter, Committee Member.
Sun, Ping Wen, and 孫秉文. "Design of Variable Resistence Pulse Tube Refrigerator." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/46618003597028149081.
Повний текст джерела國立臺灣大學
機械工程學研究所
87
The main purpose of the research is to discuss replacing a needle valve or an orifice used in an orifice pulse tube refrigerator(OPT) with a variable resistence, and its effects to the performance of a pulse tube refrigerator.From three different types of designs(random-switch variable resistence,synchronous-switch variable resistence,and pressure-controlled-switch variable resistence) of a variable resistence pulse tube refrigerator(VRPT),we can find the optimal operating conditions for a VRPT.From analyses of the flow network theory to the system,we can compare the difference between analyses of the theory and experimental results,and test the applicability of the theory.Finally we can find the performance of a VRPT is not better than the performance of an OPT.But the facility of a variable resistence is better than a needle valve,so VRPT has the potential of practical application.
YOU, TZUNG-SHIUN, and 游宗勳. "The Research of Capillary Pulse-Tube Refrigerator." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/72862556081139275873.
Повний текст джерелаJING-TUN, YOU, and 游鏡涒. "Control of a Variable Resistance Pulse Tube refrigerator." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/42428957093761270512.
Повний текст джерела國立臺灣大學
機械工程學研究所
88
The main purpose of this study is to control the cold-end temperature of the VRPT (Variable Resistance Pulse Tube refrigerator) including fixed the cold-end temperature control and increasing the cooling speed in order to apply the VRPT to the CPU cooling in personal computers. The system identification was used in this study to find out the transfer function of the cold-end temperature and the particular input by separating the influence of many inputs of the system. The controller controlled the cold-end temperature in order to achieve a faster cooling speed was designed by an average model of the system over the operating range after considering the nonlinear of the system. The result showed that controlling the cold-end temperature of the VRPT is feasible. The PDF controller can fit the specification and have a better robustness after controlling the cold-end temperature precisely. As a result, the theory of designing the PDF controller makes the VRPT be able to applied in CPU cooling.
Yu, Guo Jr, and 余國誌. "Performance Improvement Research of Orifice Pulse Tube Refrigerator." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/22036507454385782063.
Повний текст джерелаAshwin, T. R. "CFD Studies Of Pulse Tube Refrigerators." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1849.
Повний текст джерелаWang, Liang-Yun, and 王良耘. "Variable Duty Cycle Orifice Pulse Tube Refrigerator System Design." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/98282681919666979990.
Повний текст джерела國立臺灣大學
機械工程學研究所
87
The concept of using electro-magnetic valves to adjust the pressure waveform in an orifice pulse tube refrigerator (OPT) is experimentally and theoretically investigated. The objective of this thesis is to build an OPT system using a modified commercial refrigerant compressor and a pair of solenoid valves. A linear flow network model was developed for the system analysis of this refrigerator. The experiment results show that adjusting the duty cycle of input pressure may improve the cooling power of an OPT up to 20%, but the flow network model is not as accurate as expected.
Yuan, Jie. "A study of pulse tube refrigerators." 1998. http://catalog.hathitrust.org/api/volumes/oclc/42641342.html.
Повний текст джерелаShi, Jinglei. "Optimization of single and multi-stage pulse tube refrigerators /." 2008. http://www.library.wisc.edu/databases/connect/dissertations.html.
Повний текст джерелаLee, Cheng-Chung, and 李正忠. "Study on the Titanium Tube Condenser for Refrigeration System of Purse Seiner." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/05317943638643962774.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
99
The purse seiner is one of the fishing vessels with lots of capital and technology in fishery industries. In west Pacific Ocean, there are 205 American Purse Seiner vessels, of which 88 vessels belong to Taiwan ship-owners (34 vessels are registered in Taiwan others are convenience flag ships). It almost occupies approximately 43 percents. The annual catching of these 34 Taiwan vessels is about two hundred thousand tons, and this is the largest amount in Taiwan deep-sea fishery. The most influential effect of the fish price depends on its fresh condition which can be well tackled by refrigerating the captured fish in best freezing condition. Thus, the design of the freezing system is of paramount importance. A 1100-ton Purse Seiner vessel of the latest design was to achieve cooling approximately 220 tons of fresh cargo (skip jack) from 2°C to -17°C within 24 hours with the aid of brine. After that, the skip jacks are moved to the dry hold and are maintained at about -40°C. The designed cargo capacity were about 1485 cubic meters, and the Purse Seiner vessel can accommodate 935.55tons (ρ=0.63 T/m3 ) at full catching and transits cargo to another vessel one time per month. This article investigates the latest condenser in a refrigerating system of Purse Seiner vessels. Nowadays, the condenser uses pure titanium tubes to replace the traditional steel tubes. Though the titanium condenser has the heat transfer area much smaller than that of the steel-tube condenser, the two condensers possess almost equivalent heat transfer performance. In addition, the former has larger margin in condensing because of its greater overall heat transfer coefficient. Moreover, it is reported that the service life of titanium tube is about 20-30 years. Key words : purse seiner, brine, pre-cooling, full catching, transit cargo