Now showing items 1-20 of 89

    • 10 K Airborne Cryocooler and High Efficiency Heat Exchangers 

      Gully, W.; Hendershott, P.; Marquardt, D.; Glaister, D.; Wilson, C. (Georgia Institute of TechnologyICC Press, 2008-05)
      Ball Aerospace has designed, built, and characterized a compact refrigeration system for cooling very low temperature infrared imagers. The system is robust, will be integrated into an airborne application, and can also ...
    • 14.5 K Hydrogen Sorption Cooler: Design and Breadboard Tests 

      ter Brake, H. J. M.; Burger, J. F.; Holland, H. J.; Meijer, R. J.; Mudaliar, A. V.; Zalewski, D. R.; Linder, M. (Georgia Institute of TechnologyICC Press, 2008-05)
      At the University of Twente, a 14.5 K hydrogen-based sorption cooler is under development. It can be used as a stand-alone 14.5 K cooler, or as a precooler, e.g., in combination with a 4 K heliumbased sorption cooler. The ...
    • A 2 K Active Magnetic Regenerative Refrigeration System for Remote Cooling. 

      Chen, W.; McCormick, J. A.; Zagarola, M. V. (Georgia Institute of TechnologyICC Press, 2008-05)
      This paper reports on the development of an Active Magnetic Regenerative Refrigeration (AMRR) system for space applications. The AMRR can continuously provide remote/distributed cooling at about 2 K and reject heat at ...
    • 30 W at 50 K Single-Stage Coaxial Pulse Tube Cooler with Tapered Buffer Tube 

      Spoor, P. S. (Georgia Institute of TechnologyICC Press, 2008-05)
      The performance of large-capacity single-stage pulse-tube coolers at temperatures below 70 K is often hampered by Rayleigh streaming, or the natural boundary-layer convection that occurs in the buffer tube (‘pulse tube’). ...
    • An Advanced Compressor for Turbo-Brayton Cryocoolers 

      Hill, R. W.; Hilderbrand, J. K.; Zagarola, M. V. (Georgia Institute of TechnologyICC Press, 2008-05)
      Future space-borne infrared sensor missions will require reliable, efficient, and lightweight cryocoolers. Reverse turbo-Brayton cryocoolers have the inherent benefits of negligible vibration emittance and the ability to ...
    • AIM Space Cryocooler Programs 

      Mai, M.; Rühlich, I.; Schreiter, A.; Zehner, S. (Georgia Institute of TechnologyICC Press, 2008-05)
      As an experienced supplier of tactical IR-technology, AIM is now involved in several IR space programs covering applications at different wavelengths. To the meet demands for compactness and weight, AIM has focused on ...
    • Analysis of a Supercritical Hydrogen Liquefaction Cycle 

      Staats, W. L.; Smith, J. L. ,Jr.; Brisson, J. G. (Georgia Institute of TechnologyICC Press, 2008-05)
      A supercritical hydrogen liquefaction cycle is proposed and analyzed numerically. If hydrogen is to be used as an energy carrier, the efficiency of liquefaction will become increasingly important. By examining some ...
    • Analysis of Multi-Stage Joule-Thomson Microcoolers 

      Cao, H. S.; Lerou, P. P. P. M.; Mudaliar, A. V.; Holland, H. J.; Derking, J. H.; Zalewski, D. R.; ter Brake, H. J. M. (Georgia Institute of TechnologyICC Press, 2008-05)
      Microcoolers machined from glass wafers based on Joule-Thomson (J-T) expansion have been investigated for many years at the University of Twente. After successful development of singlestage J-T microcoolers with a cooling ...
    • Application of New Figures of Merit for Multi-Stage Cryocoolers 

      Delmas, J.; Kadin, A. M.; Webber, R. J.; Track, E. K. (Georgia Institute of TechnologyICC Press, 2008-05)
      Evaluation of the overall performance of a multi-stage cryocooler, including the cooling power available on the intermediate stages, is not trivial, but is necessary to choose or design efficiently a cooler for a defined ...
    • Are P-V and T-S Diagrams Meaningful for Regenerative Cryocoolers? 

      Kittel, Peter (Georgia Institute of TechnologyICC Press, 2008-05)
      P-V and T-S diagrams are commonly used tools to illustrate thermodynamic cycles. For recuperative cycles, it is easy to idealize a cycle so that the history of a gas element can be traced on P-V and T-S diagrams as it flows ...
    • CFD Simulation and Experimental Validation of a Diaphragm Pressure Wave Generator 

      Huang, T.; Caughley, A. J.; Young, R.; Chamritski, V. (Georgia Institute of TechnologyICC Press, 2008-05)
      Industrial Research Ltd has been developing a low-cost diaphragm pressure wave generator for cryocoolers since 2004. Thermodynamic losses in the pressure wave generator can have a significant impact on the overall efficiency ...
    • Clearance Loss Analysis in Linear Compressor with CFD Method. 

      Zhou, Wenjie; Gan, Zhihua; Zhang, Xiaobin; Qiu, Limin; Wu, Yinzhe (Georgia Institute of TechnologyICC Press, 2008-05)
      The non-contact seal technology, referred to as clearance seals, is used in linear compressors and promises to maintain the linear compressor for long life operation. The present effort analyzes the aerodynamics in the ...
    • Compact Linear Split Stirling Cryogenic Cooler for High Temperature Infrared Imagers 

      Veprik, A.; Zehtzer, S.; Pundak, N.; Riabzev, S (Georgia Institute of TechnologyICC Press, 2008-05)
      Novel high-definition night vision imagers are being enabled by new high-temperature infrared detectors that operate at elevated temperatures ranging from 95K to 200K; these have performance indices comparable with those ...
    • Comparison of Thermoelectric and Stirling Type Cryocoolers Using Control Thermodynamic Model 

      Razani, A.; Dodson, C.; Roberts, T. (Georgia Institute of TechnologyICC Press, 2008-05)
      New efforts are underway to develop thermoelectric materials for cooling of infrared detectors at cryogenic temperatures. Stirling type cryocoolers routinely produce cooling at cryogenic temperatures with good efficiency, ...
    • Concept of a Powerful Cryogen-Free Dilution Refrigerator with Separate 1 K Stage 

      Uhlig, Kurt (Georgia Institute of TechnologyICC Press, 2008-05)
      Helium-3,4 dilution refrigerators (DR) are the workhorses for ultralow temperature scientists. DRs can be continuously operated for unlimited periods of time, and compared to other cooling techniques offer high cooling ...
    • Continuously Variable Inertance Tubes for Pulse Tube Refrigerators 

      Pfotenhaue, J. M.; Steiner, T.; Qiu, Limin (Georgia Institute of TechnologyICC Press, 2008-05)
      The efficiency and cooling power of pulse tube refrigerators are highly dependent on the phase angle between the mass flow and pressure waves used to produce cooling. Inertance tubes are commonly used to set the phase angle ...
    • Cryocooler Prognostic Health Management System 

      Sandt , E.; Penswick , L.; Shah, A.; Dodson, C.; Roberts, T. (Georgia Institute of TechnologyICC Press, 2008-05)
      The use of cooled sensors in ever more complex, integrated applications has made determination of the cryocooler and related component “health or remaining reliable useful life” a critical factor in successfully meeting ...
    • Cryocoolers for Microsatellite Military Applications 

      Pettyjohn, Erin (Georgia Institute of TechnologyICC Press, 2008-05)
      Space qualified cryocoolers have been extensively developed for large military and commercial satellite electro-optical (EO) infrared (IR) missions, but not so for microsatellites due to the complexity of the thermodynamics ...
    • Demonstration of a Cryogenic Boil-Off Reduction System Employing an Actively Cooled Thermal Radiation Shield 

      Feller, J. R.; Plachta, D. W.; Mills, G.; McLean, C (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. ...
    • Design and Analysis of Power Controller for Moving Magnet Linear Motor Compressor 

      Jacob, S.; Sriram Prabhu, K.; Karunanithi, R.; Ramanarayanan, V. (Georgia Institute of TechnologyICC Press, 2008-05)
      Permanent magnet linear motors (PMLM) are widely used in the design of pulse tube cryocoolers. In this paper, we discuss the design and analysis of a power controller used to drive the dual opposing piston type motors used ...