Variable Conductance Heat Pipes for Radioisotope Stirling Systems

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNC07QA40P
Agency Tracking Number: 067094
Amount: $69,919.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2006
Solicitation Topic Code: S2.03
Solicitation Number: N/A
Small Business Information
1046 New Holland Avenue, Lancaster, PA, 17601-5688
DUNS: 126288336
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 William Anderson
 Principal Investigator
 (717) 295-6104
Business Contact
 Jon Zuo
Title: President
Phone: (717) 295-6058
Research Institution
The overall program objective is to develop a high temperature variable conductance heat pipe (VCHP) backup radiator, and integrate it into a Stirling radioisotope power system. A VCHP is similar to a heat pipe, but has a reservoir and a controlled amount of non-condensable gas (NCG) inside the reservoir. At low power, most of the condenser is blocked by the NCG. As the power increases, more and more of the condenser becomes active. This allows a VCHP to passively control the temperature while the power varies. Aluminum/ammonia VCHPs are commonly used in spacecraft thermal control. The proposed program will extend this concept to the alkali metal heat pipes that will be required for a Stirling system. During normal operation, the VCHP will be inactive. If the Stirling engine stops working for any reason, the VCHP will passively remove the heat from the General Purpose Heat Source (GPHS) preventing the GPHS from overheating. The benefits of the VCHP radiator include increased safety and reliability, and the ability to design an optimum Stirling engine.

* Information listed above is at the time of submission. *

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