Experimental Investigation of Isochoric and Isobaric Compressed Air Energy Storage Systems for Power Generation

Authors

  • Mebratu Adamu Assegie School of Energy Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India Author
  • Pankaj Kalita Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India Author
  • Niranjan Sahoo Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India Author
  • Pushpendra Singh School of Energy Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India Author

DOI:

https://doi.org/10.63635/mrj.v1i1.8

Keywords:

Energy storage, Isobaric and Isochoric storage tank, power generation, Efficiency

Abstract

Compressed Air Energy Storage (CAES) is a promising energy storage solution that enhances renewable energy efficiency while being cost-effective and environmentally sustainable. This study experimentally compared isobaric and isochoric CAES systems for power generation at a storage pressure of 6 bar, focusing on their charging, discharging, and overall electrical efficiency. During the charging phase, isobaric systems stored 1.54 kWh of more energy than the isochoric system. The maximum compressor outlet temperatures of isobaric and isochoric systems are found to be 91.2 ℃ and 120.5 ℃ respectively. The discharging phase revealed significant performance differences: the isochoric system achieved a maximum airflow rate of 72.92 m³/h and rotational speed of 1191 RPM, compared to the isobaric system's 48.6 m³/h and 1098 RPM. However, the isochoric system discharged its energy in 130 seconds, while the isobaric system sustained discharge for 195 seconds. Electrical efficiency was 62.82% higher for the isobaric system than for the isochoric system. This study highlights the operational advantages and limitations of each system, providing valuable insights for optimizing CAES technologies.

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Published

2025-03-31

Issue

Volume 1, Issue 1, 2025

Section

Research Articles

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How to Cite

Assegie, M. A., Kalita, P., Sahoo, N., & Singh, P. (2025). Experimental Investigation of Isochoric and Isobaric Compressed Air Energy Storage Systems for Power Generation. Multidisciplinary Research Journal, 1(1), 69-82. https://doi.org/10.63635/mrj.v1i1.8