NDLI: Pool Boiler Heat Transport System For A 25 Kwe Advanced Stirling Conversion System

Content Provider	IEEE Xplore Digital Library
Author	Anderson, W.G. Rosenfeld, J.H. Saaski, E.L. Noble, J. Tower, L.
Copyright Year	1990
Description	Author affiliation: Thermacore. Inc. (Anderson, W.G.)
Abstract	The overall operating temperature and efficiency of solar-owered Stirling engines can be improved by adding a heat transport system to more uniformly supply heat to the heater head tubes. One heat transport system with favorable characteristics is an alkali liquid metal pool boiler. One potential issue with liquid metal pool boilers is unstable boiling. To obtain stable boiling, enhanced boiling surfaces were used with nucleation sites that promote continuous boiling. This paper reports on experiments to determine alkali metal/enhanced surface combinations that have stable boiling. Two enhanced surfaces and two alkali metal working fluids were evaluated. The enhanced surfaces were an EDM hole covered surface and a sintered-powder-metal porous layer surface. The working fluids tested were potassium, and eutectic wdium-potassium alloy (NaK) - both with and without undissolved non-condensible gas. Non-condensible gas and Xe) was added to the system to provide gas in the nucleation sites, preventing quenching of the situ. The experiments demonstrated the potential of an alkali metal pool boiler for use in a solar-powered Stirling engine. The most favorable fluid/surface combination tested was NaK boiling on a -1 00 + 140 mesh 304L stainless. steel sintered porous layer, with no undissolved non-condensible gas. This combination provided stable, high-performance boiling at the operating temperature of 700'C. Heat fluxes into the system ranged from 10 to 50 W/cm/sup 2/. The transition from free convection to nucleate boiling occurred at temperatures near 540'C. Based on these experiments, a pool boiler was designed for a fall-scale 25 kWe Stirling system.
Starting Page	268
Ending Page	273
File Size	454621
Page Count	6
File Format	PDF
ISBN	0816904901
DOI	10.1109/IECEC.1990.747962
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-08-12
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Boilers Temperature Heat engines Stirling engines Solar heating Containers Testing Thermal resistance Mirrors Surface resistance
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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