Low energy efficiency is one of the most significant shortcomings of industrial pneumatic systems. The isobaric air storage tank is a new concept for improving the energy efficiency of pneumatic systems. In this study, comprehensive accumulated and transient exergy analyses are conducted to provide insight into the energy‐saving mechanism of isobaric air storage tanks. The results show that the system exergy efficiency can be improved by replacing the isochoric tank with an isobaric one. There is negligible exergy destruction in both storage tanks. However, the storage tank can bring about significant influences on other components. The isobaric tank can effectively improve the exergy efficiencies of the compressor, cooler, and regulator. Besides, there is a huge potential to improve system exergy efficiency by taking advantage of the wasted exergy from the pneumatic cylinder.

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