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Mathematical Problems in Engineering
Volume 2015, Article ID 921413, 11 pages
http://dx.doi.org/10.1155/2015/921413
Research Article

The Fracture Influence on the Energy Loss of Compressed Air Energy Storage in Hard Rock

1State Key Laboratory of Disaster Reduction in Civil Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
2Department of Civil Engineering, Hefei University of Technology, Anhui 230009, China

Received 15 March 2015; Revised 8 June 2015; Accepted 9 June 2015

Academic Editor: Timon Rabczuk

Copyright © 2015 Hehua Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A coupled nonisothermal gas flow and geomechanical numerical modeling is conducted to study the influence of fractures (joints) on the complex thermohydromechanical (THM) performance of underground compressed air energy storage (CAES) in hard rock caverns. The air-filled chamber is modeled as porous media with high porosity, high permeability, and high thermal conductivity. The present analysis focuses on the CAES in hard rock caverns at relatively shallow depth, that is, ≤100 m, and the pressure in carven is significantly higher than ambient pore pressure. The influence of one discrete crack and multiple crackson energy loss analysis of cavern in hard rock media are carried out. Two conditions are considered during each storage and release cycle, namely, gas injection and production mass being equal and additional gas injection supplemented after each cycle. The influence of the crack location, the crack length, and the crack open width on the energy loss is studied.