Now showing items 51-70 of 89

    • 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 ...
    • Progress in the Development and Performance of a High Frequency 4 K Stirling-Type Pulse Tube Cryocooler 

      Bradley, P. E.; Radebaugh, R.; Garaway, I.; Gerecht, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      Presently we are in the development process for a 4 K Stirling-type pulse tube cryocooler to support cooling requirements for a mobile THz detector system. In this paper we discuss the status of this development and the ...
    • Progress in the Development of the IXO 50 mK Sorption-ADR stage 

      Duval, J. M.; Luchier, N.; Duband, L.; Tirolien, T. (Georgia Institute of TechnologyICC Press, 2008-05)
      The nominal temperature of the new generations of detectors for the next space mission International X-ray Observatory (IXO) is expected to be around 50 mK. The coupling of a 3He cooler with an ADR provides an elegant ...
    • Pulse Tube Cooler with Remote Cooling 

      Raab, J.; Maddocks, J. R.; Nguyen, T.; Toma, G.; Colbert, R.; Tward, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      Space pulse tube coolers are very efficient, but like all regenerative high frequency Stirling and pulse tube coolers, the cold head needs to be located near the compressor in order to minimize the input power to the cooler. ...
    • Reduction of Self Induced Vibration in Rotary Stirling Cycle Coolers 

      Bin-Nun, U. (Georgia Institute of TechnologyICC Press, 2008-05)
      Cryocooler is a major consideration in the design of IR imaging systems, especially when mounted on stabilized platforms with gimbals. The coolers in these types of applications induce forces and moments that interfere ...
    • Regenerator Friction Factor and Nusselt Number Information Derived from CFD Analysis 

      Cheadle, M. J.; Nellis, G. F.; Klein, S. A. (Georgia Institute of TechnologyICC Press, 2008-05)
      Macroscopic models used in the design and development of pulse tube cryocooler regenerators do not explicitly consider the complex microscopic interaction of the working fluid as it flows through the interstitial passages ...