High-Efficiency, Low-Temperature Regenerators for Cryocoolers

Award Information
Agency:
National Aeronautics and Space Administration
Amount:
$599,445.00
Program:
SBIR
Contract:
NNA05BE69C
Solitcitation Year:
2003
Solicitation Number:
N/A
Branch:
N/A
Award Year:
2005
Phase:
Phase II
Agency Tracking Number:
033245
Solicitation Topic Code:
S2.04
Small Business Information
Atlas Scientific
1367 Camino Robles Way, San Jose, CA, 95120-4925
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
938515913
Principal Investigator
 Ali Kashani
 Principal Investigator
 (408) 507-0906
 akashani@atlasscientific.com
Business Contact
 Ali Kashani
Title: Business Official
Phone: (408) 507-0906
Email: akashani@atlasscientific.com
Research Institution
N/A
Abstract
Future NASA planetary and astrophysics missions will require various enhancements in multi-stage cryocoolers. These include increased efficiency, reduced vibration and reductions in overall system mass and power consumption. For the small coolers required, pulse tube and Stirling coolers offer the best opportunities. At present, the efficiency of these coolers is limited by the effectiveness of low-temperature-stage regenerators. Below about 60 K, two factors play key roles in reducing the effectiveness of regenerators. One is that the heat capacity of most materials falls rapidly with decreasing temperature, thereby, severely limiting the number of useful materials to a few in common use. A second factor is that these commonly used materials are only available in powder form, a form known to raise reliability issues. In this effort, we will address both factors. We will use newly developed materials with high heat capacities at temperatures below 60 K, higher than that of commonly used materials. Further, we will develop a novel low-temperature regenerator matrix that will address both the aspect of high-efficiency and regenerator durability. Both the void fraction and the ratio of surface area to solid fraction of the regenerator matrix will be varied to achieve high efficiency.

* information listed above is at the time of submission.

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