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Electronic Resource
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Publication
DOE NASA 0038 80 2; Report; April 1980.
Language
Library's review
ABSTRACT:
This final report documents the results of Contract DEN 3-38, Active Heat Exchanger System Development for Latent Heat Thermal Energy Storage Systems. The project was sponsored by the U.S. Department of Energy/Division of Energy Storage Systems and managed by the National Aeronautics and
This final report documents the results of Contract DEN 3-38, Active Heat Exchanger System Development for Latent Heat Thermal Energy Storage Systems. The project was sponsored by the U.S. Department of Energy/Division of Energy Storage Systems and managed by the National Aeronautics and
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Space Administration/Lewis Research Center. The overall project consisted of five tasks to select, design, fabricate, test and evaluate candidate active heat exchanger modules for future applications to solar and conventional utility power plants. Alternative mechanizations of active heat exchange concepts were analyzed for use with heat of fusion Phase Change Materials (PCMs) in the temperature range of 250° to 350°c. Twenty-six heat exchange concepts were reviewed, and eight were selected for detailed assessment. Two candidates were selected for small-scale experimentation: a coated tube and shell heat exchanger and a direct contact reflux boiler. A dilute eutectic mixture of sodium nitrate and sodium hydroxide was selected as the PCM from over 50 candidate inorganic salt mixtures. Based on a salt screening process, eight major component salts were selected initially for further evaluation. Using an economic assessment program coupling the candidate salt mixtures and heat exchange concepts, NaNo3, NaN02, and NaOH appeared to be the most attractive major components in the temperature range of 250° to 35o0c. The minor components, selected in similar fashion, were NaOH, NaOH, and NaNo3, respectively. Show Less