Exergy Analysis of Compressed Air Energy Storage System

Guang-lin LIU, Chang-miao LIU

Abstract


The supercritical compressed air energy storage system (CAES) is a large-scale energy storage system, which can effectively improve the utilization efficiency of renewable energy power generation, and has the advantages of independent operation, high energy density and friendly environment. In this paper, the exergy efficiency and loss of the main equipment in the system are analyzed. Conclusions are as follows: the heat exchanger has the highest efficiency and air compressor has the biggest exergy loss. However, energy utilization of the CEES can be effectively improved if the efficiency of the air expander is increased. The exergy efficiency of the pump is lowest, but the pump energy loss is the least, so it is not recommended to spend a lot of energy on improvement of pump efficiency.

Keywords


CAES, Exergy efficiency, Energy storage, Renewable energy


DOI
10.12783/dtetr/oect2017/16130

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