ABSTRACT
The utilization of thermal energy storage (TES) devices allows for the storing of heat and cold for later usage. When there is an imbalance between the production and use of energy, TES can aid in its effective use and provision. Additionally, the supply and consumption of energy throughout the day and night may be balanced using TES systems. Large pools of water buried deep below the surface as well as soil- or rock-based storage tanks that may be accessible by boreholes are examples of storage uses. How long the TES system can store extra thermal energy depends on the different technologies used to do so. Underground thermal energy storage (UTES) is a technique for storing thermal energy that makes use of the subsurface to store both heat and cold. This chapter discusses a number of UTES technologies, such as borehole TES (BTES), aquifer TES (ATES), cavern TES (CTES), pit TES (PTES), and water tank TES (TTES). The most cutting-edge UTES technologies now commercially accessible are BTES and ATES. The primary use for these two UTES systems is seasonal storage. The primary UTES systems described here are discussed in this chapter, along with their key benefits and drawbacks. The primary uses for the most advanced UTES systems, such as greenhouses and buildings, are covered in the following sections.
