NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 28 of 4587
Alkali metal pool boiler life tests for a 25 kWe advanced Stirling conversion system
Author and Affiliation:
Anderson, W. G.(NASA Lewis Research Center, Cleveland, OH, United States)
Rosenfeld, J. H.(Thermacore, Inc., Lancaster, PA, United States)
Noble, J.(Stirling Technologies, Co., Richland, WA, United States)
Abstract: The overall operating temperature and efficiency of solar-powered Stirling engines can be improved by adding an alkali metal pool boiler heat transport system to supply heat more uniformly to the heater head tubes. One issue with liquid metal pool boilers is unstable boiling. Stable boiling is obtained with an enhanced boiling surface containing nucleation sites that promote continuous boiling. Over longer time periods, it is possible that the boiling behavior of the system will change. An 800-h life test was conducted to verify that pool boiling with the chosen fluid/surface combination remains stable as the system ages. The apparatus uses NaK boiling on a - 100 + 140 stainless steel sintered porous layer, with the addition of a small amount of xenon. Pool boiling remained stable to the end of life test. The pool boiler life test included a total of 82 cold starts, to simulate startup each morning, and 60 warm restarts, to simulate cloud cover transients. The behavior of the cold and warm starts showed no significant changes during the life test. In the experiments, the fluid/surface combination provided stable, high-performance boiling at the operating temperature of 700 C. Based on these experiments, a pool boiler was designed for a full-scale 25-kWe Stirling system.
Publication Date: Jan 01, 1991
Document ID:
19920068173
(Acquired Nov 22, 1995)
Accession Number: 92A50797
Subject Category: MECHANICAL ENGINEERING
Document Type: Conference Paper
Publication Information: SEE A92-50771
Publisher Information: United States
Meeting Information: 26th IECEC '91: Intersociety Energy Conversion Engineering Conference; Aug. 4-9, 1991; Boston, MA; United States
Contract/Grant/Task Num: DEN3-377
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALKALI METALS; BOILERS; HEAT TRANSFER; LIFE (DURABILITY); SOLAR GENERATORS; STIRLING ENGINES; ENERGY CONVERSION EFFICIENCY; LIQUID POTASSIUM; LIQUID SODIUM; THERMAL CYCLING TESTS
Imprint And Other Notes: IN: IECEC '91; Proceedings of the 26th Intersociety Energy Conversion Engineering Conference, Boston, MA, Aug. 4-9, 1991. Vol. 5 (A92-50771 21-37). La Grange Park, IL, American Nuclear Society, 1991, p. 343-348. Research supported by DOE.
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 19, 2011
Contact Us