Now showing items 46-65 of 89

    • Impact of Small Regenerator Structural Flaws on the Performance of Miniature Pulse Tube Cryocoolers 

      Conrad, T. J.; Ghiaasiaan, S. M. (Seyed M.); Kirkconnell, Carl Scott; Crittenden, Thomas M. (Georgia Institute of TechnologyICC Press, 2008-05)
      Miniature cryocoolers are suitable for space applications and installation in portable devices. They can also be useful as final stages for applications where small cooling loads must be carried at temperatures lower than ...
    • In-Flight Performance of the HERSCHEL Sorption Coolers – One Year of Operation 

      Duband, L.; Ercolani, E.; Guillemet, L.; Sauvage, M.; Martignac, J.; Swinyard, B.; Griffin, D.; Jewell, C.; Collaudin, B. (Georgia Institute of TechnologyICC Press, 2008-05)
      HERSCHEL, the fourth ‘cornerstone’ mission in the ESA science program, was launched on 14 May 2009 from Kourou, French Guyana. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. HERSCHEL is ...
    • Inertance Tube and Reservoir Modeling: Meshing, Convergence and Friction Factors for Oscillating Flow 

      Dodson, C.; Razani, A.; Roberts, T. (Georgia Institute of TechnologyICC Press, 2008-05)
      Pulse tube refrigerators (PTRs) have made dramatic improvements in reliability, efficiency and usage, with the addition of the inertance tube helping to create the improvements. The combination of the inertance tube and ...
    • Investigation on the Phase Characteristics of High Frequency Inertance Pulse Tube Cryocoolers above 50 K. 

      Li, S. S.; Dang, H. Z.; Wu, Y. N.; Wang, L. B.; Yang, K. X. (Georgia Institute of TechnologyICC Press, 2008-05)
      Phase characteristics of an inertance pulse tube cryocooler (IPTC) mainly include the mass flows, the pressure amplitudes, and the phase shifts between them. These are decisive factors for cooler performance, and are ...
    • Investigations on a Standing Wave Thermoacoustic Refrigerator 

      Dhuley, R. C.; Atrey, M. D. (Georgia Institute of TechnologyICC Press, 2008-05)
      The dynamic pressure inside a Thermoacoustic Refrigerator (TAR) is an important parameter which governs the cold temperature and the cooling power. The present work aims to investigate the effect of two operating parameters: ...
    • Liquid Nitrogen Energy Storage Units 

      Afonso, J.; Catarino, I.; Martins, D.; Duband, L.; Patrício, R.; Bonfait, G. (Georgia Institute of TechnologyICC Press, 2008-05)
      The energy storage units (ESU) described in this article are to be attached to the cold finger of a cryocooler with the objective of holding the low temperature environment constant while the cooler may be temporarily ...
    • Low Temperature Adsorption Versus Pore Size in Activated Carbons 

      Martins, D.; Catarino, I.; Lopes, D.; Esteves, I.; Mota, J. P.; Bonfait, G. (Georgia Institute of TechnologyICC Press, 2008-05)
      Activated carbons have been used for a long time at low temperature for cryogenic applications. The physisorption properties depend on the pore geometry and size: this feature can be used to optimize the carbon structure ...
    • Measured and Calculated Performance of a High Frequency, 4 K Stage, He-3 Regenerator 

      Garaway, I.; Lewis, M. A.; Bradley, P. E.; Radebaugh, R. (Georgia Institute of TechnologyICC Press, 2008-05)
      Efficiencies of small 4 K cryocoolers are less than 1% of Carnot, whereas 80 K cryocoolers achieve efficiencies of up to almost 20% of Carnot. The primary loss mechanisms in low temperature regenerative cryocoolers are ...
    • MIRI Cooler System Design Update 

      Petach, M.; Durand, D.; Michaelian, M.; Raab, J.; Tward, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      NASA, under the Cryogenic Fluid Management (CFM) Project, in partnership with Ball Aerospace Technologies Corporation (BATC), conducted a reduced boil-off demonstration employing an actively cooled thermal radiation shield. ...
    • Modular Linear-Drive Cryocooler Electronics 

      Kirkconnell, Carl Scott; Freeman, J. J.; Hon, R. C.; Jackson, M. A.; Kieffer, M. H. (Georgia Institute of TechnologyICC Press, 2008-05)
      The Modular Advanced Cryocooler Electronics (MACE) system developed at Iris Technology Corporation combines configurable, high-power motor drives with precision telemetry capability in a design that is amenable to radiation ...
    • Numerical Modeling on Reciprocating Active Magnetic Refrigeration Regenerator at Room Temperature 

      Li, Jing; Numazawa, T.; Matsumoto, K.; Nakagome, H. (Georgia Institute of TechnologyICC Press, 2008-05)
      A 2-dimension porous media model has been constructed for Reciprocating Active Magnetic Refrigeration Regenerator (AMR). The 2-D model is solved using a fully implicit (in time and space) discretization of the 2-dimension ...
    • An Oil-Free Compressor for Gifford McMahon Cold Heads 

      Caughley, A. J.; Meier, J. (Georgia Institute of TechnologyICC Press, 2008-05)
      Industrial Research Ltd (IRL) has developed a novel metallic-diaphragm pressure wave generator technology for large high-frequency (30-60 Hz) pulse tube cryocoolers. A diaphragm pressure wave generator, using a conventionally ...
    • Open Cycle Joule-Thomson Cryocooling by Mixed Coolant 

      Maytal, B-Z. (Georgia Institute of TechnologyICC Press, 2008-05)
      Mixed coolants are conventionally employed for the closed cycle Joule-Thomson mode of cryocooling. Here, the potential of mixed coolants is utilized for reducing the pressure of operation. Numerous experimental and theoretical ...
    • Performance and Mass vs. Operating Temperature for Pulse Tube and Stirling Cryocoolers 

      Ladner, D. R. (Georgia Institute of TechnologyICC Press, 2008-05)
      Single stage pulse tube and Stirling cryocooler data that were reported in the open literature during the past decade were analyzed to find mathematical scaling laws for estimating the required input power and mass, as ...
    • Performance Investigation on SITP’s 60 K High Frequency Single-Stage Coaxial Pulse Tube Cryocoolers. 

      Dang, H. Z.; Wang, L. B.; Wu, Y. N.; Li, S. S.; Yang, K. X.; Shen, W. B. (Georgia Institute of TechnologyICC Press, 2008-05)
      A series of 60 K high frequency single-stage coaxial pulse tube cryocoolers has been developed to provide reliable low-noise cooling at 60 K for space-borne long wave infrared focal plane arrays. The development goal and ...
    • Performance of a Stirling-Type Pulse Tube Cooler for High Efficiency Operation at 100 Hz. 

      Wang, Xiaotao; Dai, Wei; Hu, Jianying; Luo, Ercang; Zhou, Yuan (Georgia Institute of TechnologyICC Press, 2008-05)
      High efficiency pulse tube coolers driven by linear compressors usually operate between 30 Hz and 60 Hz. This article presents the performance of a high efficiency in-line PTC with an operating frequency of 100 Hz. The ...
    • Performance Test of Pulse Tube Cooler with Integrated Circulator 

      Maddocks, J. R.; Maddocks, P.; Fay, M.; Helvensteijn, B. P. M.; Kashani, A. (Georgia Institute of TechnologyICC Press, 2008-05)
      To address the need for remote and broad area cooling using regenerative cryocoolers, Atlas Scientific is developing a lightweight, continuous-flow Integrated Circulator (IC) for installation on Pulse Tube Cryocoolers ...
    • Phasor Analysis of Pulse Tube Refrigerator 

      Mohanta. L.; Atrey, M. D. (Georgia Institute of TechnologyICC Press, 2008-05)
      A phasor diagram for a pulse tube refrigerator (PTR) is a vectorial representation of mass flow rate, pressure, and temperature at different locations as a function of time. With the help of a phasor diagram, the operation ...
    • Pressure Drop Characteristics of Slit-Type Heat Exchanger 

      Ki, T.; Jeong, S. (Georgia Institute of TechnologyICC Press, 2008-05)
      A slit-type heat exchanger offers several advantages to the design of cryocoolers; it can accommodate various configurations either in a straight or tapered shape and involves no thermal contact resistance problems, which ...
    • Progress in Joule-Thomson Microcooling at the University of Twente 

      Derking, J. H.; Zalewski, D. R.; Garcia, M.; Holland, H. J.; Mudaliar, A. V.; Cao, H. S.; Lerou, P. P. P. M.; ter Brake, H. J. M. (Georgia Institute of TechnologyICC Press, 2008-05)
      The development of miniaturized Joule-Thomson (JT) coolers has been an ongoing research topic at the University of Twente for many years. In the current research, a new run of singlestage JT microcoolers with gross cooling ...