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Active heat exchange system development for latent heat thermal energy storageVarious active heat exchange concepts were identified from among three generic categories: scrapers, agitators/vibrators and slurries. The more practical ones were given a more detailed technical evaluation and an economic comparison with a passive tube-shell design for a reference application. Two concepts selected for hardware development are a direct contact heat exchanger in which molten salt droplets are injected into a cooler counterflowing stream of liquid metal carrier fluid, and a rotating drum scraper in which molten salt is sprayed onto the circumference of a rotating drum, which contains the fluid heat sink in an internal annulus near the surface. A fixed scraper blade removes the solidified salt from the surface which has been nickel plated to decrease adhesion forces. Suitable phase change material (PCM) storage media with melting points in the temperature range of interest (250 C to 400 C) were investigated. The specific salt recommended for laboratory tests was a chloride eutectic (20.5KCl-24/5 NaCl-55.0MgCl 2% by wt.), with a nominal melting point of 385 C.
Document ID
19800014334
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Alario, J.
(Grumman Aerospace Corp. Bethpage, NY, United States)
Haslett, R.
(Grumman Aerospace Corp. Bethpage, NY, United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1980
Publication Information
Publication: NASA. Lewis Res. Center Thermal Energy Storage
Subject Category
Energy Production And Conversion
Accession Number
80N22822
Funding Number(s)
CONTRACT_GRANT: DEN3-39
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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