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Article

Increasing Compressed Gas Energy Storage Density Using CO2–N2 Gas Mixture

Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
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Energies 2020, 13(10), 2431; https://doi.org/10.3390/en13102431
Received: 13 April 2020 / Revised: 6 May 2020 / Accepted: 7 May 2020 / Published: 12 May 2020
(This article belongs to the Section D: Energy Storage and Application)
This paper demonstrates a new method by which the energy storage density of compressed air systems is increased by 56.8% by changing the composition of the compressed gas to include a condensable component. A higher storage density of 7.33 MJ/m3 is possible using a mixture of 88% CO2 and 12% N2 compared to 4.67 MJ/m3 using pure N2. This ratio of gases representing an optimum mixture was determined through computer simulations that considered a variety of different proportions from pure CO2 to pure N2. The computer simulations are based on a thermodynamic equilibrium model that predicts the mixture composition as a function of volume and pressure under progressive compression to ultimately identify the optimal mixture composition (88% CO2 + 12% N2). The model and simulations predict that the optimal gas mixture attains a higher energy storage density than using either of the pure gases. View Full-Text
Keywords: GLIDES; pumped storage; compressed air storage; vapor liquid equilibrium; binary mixture GLIDES; pumped storage; compressed air storage; vapor liquid equilibrium; binary mixture
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MDPI and ACS Style

Abuheiba, A.; Ally, M.R.; Smith, B.; Momen, A. Increasing Compressed Gas Energy Storage Density Using CO2–N2 Gas Mixture. Energies 2020, 13, 2431. https://doi.org/10.3390/en13102431

AMA Style

Abuheiba A, Ally MR, Smith B, Momen A. Increasing Compressed Gas Energy Storage Density Using CO2–N2 Gas Mixture. Energies. 2020; 13(10):2431. https://doi.org/10.3390/en13102431

Chicago/Turabian Style

Abuheiba, Ahmad, Moonis R. Ally, Brennan Smith, and Ayyoub Momen. 2020. "Increasing Compressed Gas Energy Storage Density Using CO2–N2 Gas Mixture" Energies 13, no. 10: 2431. https://doi.org/10.3390/en13102431

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