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Analysis of Geo-Energy System with Focus on Borehole Thermal Energy Storage

Henrik, Holmberg (2009)
Department of Energy Sciences
Abstract
Ground source heat pump (GSHP) systems have become more popular lately both for
residential space heating and for commercial applications. GSHP systems can use
water, ground or the bedrock as a thermal source. The energy extracted is regarded as
a renewable energy-source and it consists of both stored solar energy and a share of
geothermal energy. A borehole thermal storage (BTES) consists of boreholes drilled
in a specific pattern with a few meters in-between. A BTES can be used for both
heating during winter and cooling during summer. The stable temperature of the
bedrock provides good performance as long as the balance between extracted and
injected heat is kept. With increasing size of GSHP-systems it is desirable to simulate
... (More)
Ground source heat pump (GSHP) systems have become more popular lately both for
residential space heating and for commercial applications. GSHP systems can use
water, ground or the bedrock as a thermal source. The energy extracted is regarded as
a renewable energy-source and it consists of both stored solar energy and a share of
geothermal energy. A borehole thermal storage (BTES) consists of boreholes drilled
in a specific pattern with a few meters in-between. A BTES can be used for both
heating during winter and cooling during summer. The stable temperature of the
bedrock provides good performance as long as the balance between extracted and
injected heat is kept. With increasing size of GSHP-systems it is desirable to simulate
the systems and to perform optimization and life cycle analysis to justify investments.
There are several existing software that can simulate a BTES but they are either
working with too large time steps or they are too complicated for industrial usage.
Within this thesis a short time-step model of a BTES is constructed based on existing
research. The model is validated using existing simulation software and then
demonstrated within a simplified GSHP-system. (Less)
Please use this url to cite or link to this publication:
author
Henrik, Holmberg
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
ground source heat pump GSHP borehole thermal storage BTES
language
English
id
1479061
date added to LUP
2009-09-22 11:58:13
date last changed
2009-09-22 11:58:13
@misc{1479061,
  abstract     = {Ground source heat pump (GSHP) systems have become more popular lately both for
residential space heating and for commercial applications. GSHP systems can use
water, ground or the bedrock as a thermal source. The energy extracted is regarded as
a renewable energy-source and it consists of both stored solar energy and a share of
geothermal energy. A borehole thermal storage (BTES) consists of boreholes drilled
in a specific pattern with a few meters in-between. A BTES can be used for both
heating during winter and cooling during summer. The stable temperature of the
bedrock provides good performance as long as the balance between extracted and
injected heat is kept. With increasing size of GSHP-systems it is desirable to simulate
the systems and to perform optimization and life cycle analysis to justify investments.
There are several existing software that can simulate a BTES but they are either
working with too large time steps or they are too complicated for industrial usage.
Within this thesis a short time-step model of a BTES is constructed based on existing
research. The model is validated using existing simulation software and then
demonstrated within a simplified GSHP-system.},
  author       = {Henrik, Holmberg},
  keyword      = {ground source heat pump
GSHP
borehole thermal storage
BTES},
  language     = {eng},
  note         = {Student Paper},
  title        = {Analysis of Geo-Energy System with Focus on Borehole Thermal Energy Storage},
  year         = {2009},
}