Performance Analysis of Compressed Air Energy Storage System
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Abstract
Compressed air energy storage technology (CAES) and pumped hydro technology are two typical energy storage technologies that have the capacity of large scale electricity storage. In this paper, four CAES systems are designed. The evolution trend of compressed air pressure and temperature in air tank as well as the characteristics for different CAES systems are discussed according to the first law of thermodynamics. It indicates that there is an obvious temperature increase during air charging process under poor heat transfer conditions. The temperature increase value is about 22.46 ℃ for 200 m3 tank when it is charged to 10 MPa with a mass flow of 1.0 kg/s. In terms of CAES system property, their heat rates are between 4 100 kJ/kW·h and 4 200 kJ/kW·h, and their energy conversion efficiencies are between 52.30% and 56.33%. As for the parameter of energy conversion efficiency and total electricity output capacity, CAES systems with better air tank heat transfer conditions have higher values.
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