Enhanced Aquifer Thermal Energy Storage For
Cooling And Heating Of Shinshu University
Building Using A Nested Well System
Author(s)
A. Tomigashi & K. Fujinawa
Abstract
An enhanced aquifer thermal energy storage (ATES) is proposed in this paper in
order to provide cooling and heating energy from groundwater to an airconditioning
system of a building at Shinshu University. By adopting the
enhanced ATES, a nested well system composed of withdrawal and injection
wells is under construction in which an upper unconfined aquifer is used to
withdraw, inject and store cooling water, and an underlying confined aquifer is
used for heating water. A variety of field tests including all-core boring,
electrical logging, thermal logging, pumping tests and thermal and salt-water
tracer tests has been performed to identify hydrogeologic and thermal properties
of the aquifer. Numerical simulations were then conducted by using SWATER
(Subsurface Water and Thermal Energy Resources), which is a program for
simulating three-dimensional water flow and heat transport in aquifer systems.
The numerical results showed that the enhanced ATES is superior to the
conventional ATES in terms of recovered thermal energy.
Keywords: enhanced aquifer thermal energy storage, nested well system, field
tests, control of groundwater flow and heat transport, numerical simulation.
1 Introduction
Underground space provides a large isolated storage volume of water for thermal
energy. Underground Thermal Energy Storage (UTES) technologies use the
capacity of this volume to store thermal energy for seasonal application. Among
UTES, Aquifer Thermal Energy Storage (ATES) and Borehole Thermal Energy
Storage (BTES) are widely used techniques. An ATES system uses groundwater
as the medium of heat transfer between an external source and the aquifer while
Keywords
enhanced aquifer thermal energy storage, nested well system, field
tests, control of groundwater flow and heat transport, numerical simulation.
Related Book
Other papers in this volume
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