Solar electric production systems with energy storage were simulated and compared, including an ammonia thermochemical cycle, compressed air energy storage (CAES), pumped hydroelectric energy storage (PHES), vanadium flow battery, and thermal energy storage (TES). All systems used the same parabolic concentrator to collect solar energy and Stirling engine to produce electricity. Efficiency and storage losses were modeled after existing experiments. At receiver and ammonia synthesis temperatures of 800 K, efficiencies of all systems except TES were initially similar at 17–19%, while TES provided ∼23%. Further, TES was most efficient for diurnal-scale storage. However, lower time-dependent storage losses caused the ammonia system to have the highest efficiency after one month of storage and to be increasingly favored as time of storage increased. Solar electric production with full capacity factor may be most efficient with a combination of systems including direct solar-electric production and systems with both diurnal and long-term storage.
Efficiency of Solar Electricity Production With Long-Term Storage
Department of Mechanical Engineering,
Louisville, KY 40292
Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: Including Wind Energy and Building Energy Conservation. Manuscript received July 10, 2012; final manuscript received May 13, 2014; published online August 25, 2014. Assoc. Editor: Nathan Siegel.
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Shakeri, M., Soltanzadeh, M., Eric Berson, R., and Keith Sharp, M. (August 25, 2014). "Efficiency of Solar Electricity Production With Long-Term Storage." ASME. J. Sol. Energy Eng. February 2015; 137(1): 011007. https://doi.org/10.1115/1.4028140
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