Comparing transient and steady-state methods for the thermal conductivity characterization of a borehole heat exchanger field in Bergen, Norway
Sign Up to like & getrecommendations! Published in 2019 at "Environmental Earth Sciences"
DOI: 10.1007/s12665-019-8397-7
Abstract: A comparative study was carried out aiming at characterizing the thermal conductivity of rocks sampled in a borehole heat exchanger field. Twenty-three samples were analysed with four different methods based on both steady-state and transient… read more here.
Keywords: exchanger field; heat exchanger; thermal conductivity; conductivity ... See more keywords
Correlations to determine the mean fluid temperature of double U-tube borehole heat exchangers with a typical geometry
Sign Up to like & getrecommendations! Published in 2017 at "Applied Energy"
DOI: 10.1016/j.apenergy.2017.09.120
Abstract: In the evaluation of thermal response tests and in the dynamic simulation of ground-coupled heat pumps, the mean temperature Tm of the working fluid in a borehole heat exchanger is usually approximated by the arithmetic… read more here.
Keywords: temperature; heat exchangers; geometry; borehole heat ... See more keywords
A new analytical model for short-term borehole heat exchanger based on thermal resistance capacity model
Sign Up to like & getrecommendations! Published in 2017 at "Energy and Buildings"
DOI: 10.1016/j.enbuild.2017.04.064
Abstract: Abstract The present study develops a new accurate and simple analytical method for modeling of heat transfer in borehole heat exchanger for short time periods. The thermal resistance and capacity circuit is used for derivation… read more here.
Keywords: heat exchanger; thermal resistance; model; borehole heat ... See more keywords
Short-term fluid temperature variations in either a coaxial or U-tube borehole heat exchanger
Sign Up to like & getrecommendations! Published in 2017 at "Geothermics"
DOI: 10.1016/j.geothermics.2016.12.001
Abstract: Abstract This paper uses composite cylindrical heat-source (CCS) models and typical thermal response test procedures to investigate two full-scale borehole heat exchangers (BHE); where one is a U-tube BHE, and the other, a pipe-in-pipe (coaxial)… read more here.
Keywords: term; tube; model; borehole heat ... See more keywords
A semi-analytical model for heat transfer in coaxial borehole heat exchangers
Sign Up to like & getrecommendations! Published in 2021 at "Geothermics"
DOI: 10.1016/j.geothermics.2020.101952
Abstract: Abstract Heat transfer model is important for the design of coaxial borehole heat exchanger (CBHE). However, the existing models have some disadvantages, such as costing too much computation time, ignoring the geothermal gradient and concerning… read more here.
Keywords: heat; semi analytical; model; coaxial borehole ... See more keywords
Computational methods for ground thermal response of multiple borehole heat exchangers: A review
Sign Up to like & getrecommendations! Published in 2018 at "Renewable Energy"
DOI: 10.1016/j.renene.2018.04.083
Abstract: Abstract Since ground-coupled heat pump system (GCHPs) has been more and more widely applied, it is vital to build an accurate method for sizing borehole heat exchangers (BHEs), and the methods for determining the heat… read more here.
Keywords: borehole heat; ground; thermal response; computational methods ... See more keywords
Analysis of deep borehole heat exchanger with horizontal branch wells for building heating
Sign Up to like & getrecommendations! Published in 2021 at "International Journal of Low-carbon Technologies"
DOI: 10.1093/ijlct/ctab041
Abstract: The development and application of enhanced geothermal system and hydrothermal system are constrained due to high cost and high risk of induced seismicity or heavily reliance on hot water reservoir. Deep borehole heat exchanger (DBHE)… read more here.
Keywords: deep borehole; heat exchanger; dbhe hbw; branch wells ... See more keywords
A Numerical Study on the Impact of Grouting Material on Borehole Heat Exchangers Performance in Aquifers
Sign Up to like & getrecommendations! Published in 2017 at "Energies"
DOI: 10.3390/en10050703
Abstract: U-pipes for ground source heat pump (GSHP) installations are generally inserted in vertical boreholes back-filled with pumpable grouts. Grout thermal conductivity is a crucial parameter, dominating the borehole thermal resistance and impacting the heat exchanger… read more here.
Keywords: heat; groundwater flow; borehole heat; borehole ... See more keywords
On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers
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DOI: 10.3390/en10091328
Abstract: Thermal response test (TRT) is a common procedure for characterization of ground and borehole thermal properties needed for the design of a shallow geothermal heat pump system. In order to investigate and to develop more… read more here.
Keywords: thermal response; control; borehole heat; heat ... See more keywords
In Situ Experiment and Numerical Model Validation of a Borehole Heat Exchanger in Shallow Hard Crystalline Rock
Sign Up to like & getrecommendations! Published in 2018 at "Energies"
DOI: 10.3390/en11040963
Abstract: Accurate and fast numerical modelling of the borehole heat exchanger (BHE) is required for simulation of long-term thermal energy storage in rocks using boreholes. The goal of this study was to conduct an in situ… read more here.
Keywords: heat exchanger; borehole; situ experiment; model ... See more keywords
Method of Averaging the Effective Thermal Conductivity Based on Thermal Response Tests of Borehole Heat Exchangers
Sign Up to like & getrecommendations! Published in 2020 at "Energies"
DOI: 10.3390/en13143737
Abstract: This work concerns borehole heat exchangers and their testing using apparatus for thermal response tests. In the theoretical part of the article, an equation was derived from the known equation of heat flow, on which… read more here.
Keywords: thermal response; thermal conductivity; borehole heat; heat ... See more keywords