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You searched on: Author: Ray Radebaugh

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1. Design and Analysis of a 150 K Cascade Joule-Thomson Microcooler
Published: 6/9/2014
Authors: Ray Radebaugh, Peter E Bradley, Collin Jennings Coolidge, Ryan J. Lewis, Y.C. Lee
Abstract: Lightweight and compact microcoolers are needed for advanced, hand-held infrared systems. A temperature of 150 K is adequate for high sensitivity with some of the latest IR detectors, which simplifies the cooling requirements compared to 80 K detect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916486

2. A Half Century of Cryogenics and CSA
Published: 5/5/2014
Author: Ray Radebaugh
Abstract: 1964 seems just like yesterday to me, yet it was 50 years ago. The Cryogenic Society of America (CSA) was born that year, and I was just beginning my professional career in cryogenics. Because I have been active in cryogenics for all these past 50 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915924

3. Performance Analysis of an Integrated Micro Cryogenic Cooler and Miniature Compressor for Cooling to 200 K
Published: 6/24/2013
Authors: Ryan John Lewis, Mu Hong Lin, Yunda Wang, Jill Cooper, Peter E Bradley, Ray Radebaugh, Marcia L Huber, Yung-Cheng Lee
Abstract: Joule-Thomson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910850

4. Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K
Published: 6/17/2013
Authors: Michael A Lewis, Ryan Pierce Taylor, Peter E Bradley, Ray Radebaugh
Abstract: Modeling with REGEN3.3 has shown that the phase between flow and pressure at the cold end of 4 K regenerators has a large effect on their second-law efficiency. The use of inertance tubes in small 4 K pulse tube cryocoolers have limited phase shifti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914237

5. Properties of Selected Materials at Cryogenic Temperatures
Published: 6/17/2013
Authors: Peter E Bradley, Ray Radebaugh
Abstract: The design of systems for operation at cryogenic temperatures requires the use of material properties at these low temperatures. The properties at cryogenic temperatures can be much different than the room-temperature values. In addition, some prop ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913059

6. Thermodynamic Analysis of Cascade Microcryocoolers with Low Pressure Ratios
Published: 6/17/2013
Author: Ray Radebaugh
Abstract: The vapor-compression cycle for refrigeration near ambient temperature achieves high efficiency because the isenthalpic expansion of the condensed liquid is a rather efficient process. However, temperatures are limited to about 200 K with a single-s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914579

7. Experimental investigation of Low-pressure refrigerant mixtures for Micro Cryogenic Coolers
Published: 2/4/2013
Authors: Ryan John Lewis, Yunda Wang, Peter E Bradley, Marcia L Huber, Ray Radebaugh, Y. C. Lee
Abstract: Micro Cryogenic Coolers (MCCs) can achieve very small sizes and high efficiencies when operating with a refrigerant mixture, but micro-scale compressors have a limited pressure output. Four refrigerant mixtures were designed to operate between 0.4 MP ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911395

8. Enthalpy change measurements of a mixed refrigerant in a microcryogenic cooler in steady and pulsating flow regimes
Published: 8/29/2012
Authors: Ryan John Lewis, Yunda Wang, Mu Hong Lin, Marcia L Huber, Ray Radebaugh, Yung-Cheng Lee
Abstract: Micro cryogenic coolers (MCCs) are useful to a number of small electronic devices which require low cooling power. The cooling power of MCCs operating with mixed refrigerants in a Joule-Thompson (J-T) cycle can be calculated based on enthalpy calcula ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909802

9. Verification of the Back-EMF Method for Piston Velocity Measurements
Published: 7/10/2012
Authors: Ray Radebaugh, Michael A Lewis, Peter E Bradley
Abstract: Linear compressors are used to drive pulse tube or Stirling cryocoolers, and they can be used as expanders in place of inertance tubes when inertance tubes cannot provide sufficient phase shifts between flow and pressure. Commercial linear compresso ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912014

10. DEMONSTRATION OF AN INTEGRATED MICRO CRYOGENIC COOLER AND MINIATURE COMPRESSOR FOR COOLING TO 200 K
Published: 11/17/2011
Authors: Ryan John Lewis, Mu Hong Lin, Yunda Wang, Jill Cooper, Peter E Bradley, Ray Radebaugh, Marcia L Huber, Yung-Cheng Lee
Abstract: Joule-Thompson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909136



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