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Evaluation of Advanced Stirling Convertor Net Heat Input Correlation Methods Using a Thermal StandardThe U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. This generator would use two high-efficiency Advanced Stirling Convertors (ASCs), developed by Sunpower Inc. and NASA Glenn Research Center (GRC). The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different operating conditions are used to simulate expected mission conditions. These conditions require achieving a particular operating frequency, hot end and cold end temperatures, and specified electrical power output for a given net heat input. In an effort to improve net heat input predictions, numerous tasks have been performed which provided a more accurate value for net heat input into the ASCs, including testing validation hardware, known as the Thermal Standard, to provide a direct comparison to numerical and empirical models used to predict convertor net heat input. This validation hardware provided a comparison for scrutinizing and improving empirical correlations and numerical models of ASC-E2 net heat input. This hardware simulated the characteristics of an ASC-E2 convertor in both an operating and non-operating mode. This paper describes the Thermal Standard testing and the conclusions of the validation effort applied to the empirical correlation methods used by the Radioisotope Power System (RPS) team at NASA Glenn.
Document ID
Document Type
Technical Memorandum (TM)
Briggs, Maxwell H.
(NASA Glenn Research Center Cleveland, OH, United States)
Schifer, Nicholas A.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
March 1, 2012
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA Paper 2011-5578
Meeting Information
9th International Energy Conversion Engineering Conference (IECEC)(San Diego, CA)
Funding Number(s)
WBS: WBS 138494.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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