Aquifer thermal energy storage reference manual: seasonal thermal energy storage program Page: 79 of 99
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Generic and Parameter Studies. Using models developed for the numerical
simulation of confined aquifer STES installations, LBL personnel shall seek to
identify key dimensionless parameter groups that characterize the hydrothermal
processes and recovery efficiency of typical STES facilities. The basic objec-
tive is the development of a general approximate graphical or semi-analytic
technique that will predict energy recovery factors for a given aquifer and
The CCC code is presently being employed to examine parameters involving:
1) vertical heat loss to confining layers, 2) radial heat loss due to smearing
and tilting of the thermal front, and 3) the characteristic tilting time of
the thermal front due to buoyancy flow. These parameter groups are expressed
in terms of thermal and hydraulic properties of the STES system. Calculations
tentatively indicate the uniqueness of these dimensionless groups for tem-
peratures ranging from 350 to 900C. In addition to the above work, the
linear flow model developed by Lund University, Sweden, is being employed in
an investigation of recovery efficiency. An optimal aspect ratio (thermal
front radius/aquifer thickness) has been identified. Beyond a certain point,
increasing injection volume does not substantially improve the recovery factor.
(In addition to C. F. Tsang, Tom Buscheck and Christine Doughty of the
Earth Sciences Division of LBL are involved in this work (415-486-6071).)
Evaluation of Auburn University's Field Test Facility Design. Using the
numerical simulation abilities of the CCC code, investigators will evaluate
and suggest improvements to the experimental design of Auburn University's
Field Test Facility (FTF). Numerical simulations suggesting the recovery
efficiency and implied impacts of both the 550 and 900C full cycles shall
be provided for the facility and operational designs that are finally adopted.
This work is divided into two phases. The first phase involves the evalu-
ation of the proposed design and the second phase tests the predictive ability
of the CCC code. Evaluation of the proposed design was completed in June of
1980. Construction of the Mobile, Alabama facility will soon be initiated.
DATE ISSUED: SUPERSEDES PNL-3471 SECTION 3.7
August 1980 ISSUE DATED: New PAGE 4
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Prater, L.S. Aquifer thermal energy storage reference manual: seasonal thermal energy storage program, report, January 1, 1980; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1053829/m1/79/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.