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FREEZING PROBLEMS IN BOREHOLE HEAT EXCHANGERS
2007There are approximately 300,000 borehole systems in Sweden with an annual growth rate of 30,000 systems. Such borehole systems are mainly used for heating of single family houses but in recent years several hundred larger systems, for both heating and cooling, have been constructed.
Bo Nordell, Anna-Karin Ahlström
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Borehole thermal resistance of U-tube borehole heat exchanger
Géotechnique Letters, 2016Thermal resistance of U-tube borehole heat exchangers (UBHE) is one of the factors that controls their design. Several equations are available in the literature to estimate the thermal resistance of UBHE. However, these equations produce different results and no definitive recommendation is available regarding their validity.
H. M. Abuel-Naga, R. R. Al-Chalabi
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2016
Predicting the thermal behavior inside and in the vicinity of BHEs is important to establish the required borehole length and to determine the resulting fluid temperature.
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Predicting the thermal behavior inside and in the vicinity of BHEs is important to establish the required borehole length and to determine the resulting fluid temperature.
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Experiences with the Borehole Heat Exchanger
2018Renewable energy sources have one thing in common; they all existed before man appeared on this planet. Wind, wave, hydro, solar, geothermal and tidal powers are all forces of nature and are mostly intermittent energy sources, geothermal is the only consistent phenomenon.
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Novel Instrument for Temperature Measurements in Borehole Heat Exchangers
IEEE Transactions on Instrumentation and Measurement, 2019The thermal response test (TRT) is the standard method for characterizing the thermal properties of the ground and those of a borehole heat exchanger (BHE). During the TRT, the inlet and outlet temperatures of the BHE are monitored. However, this test typically considers the ground as a homogeneous, isotropic, and infinite media, and therefore, it only
Nordin Aranzabal +4 more
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Thermal interaction between tunnel ground heat exchangers and borehole heat exchangers
Geomechanics for Energy and the Environment, 2017Renewable geothermal energy is an energy source that can be used for heating and cooling purposes. One common method of harvesting this energy is using engineering structures in contact with the ground, such as structural piles, diaphragm walls or tunnels (with geothermal loops integrated into the tunnel lining/invert (tunnel ground heat exchangers ...
Asal Bidarmaghz +4 more
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Borehole resistance and vertical temperature profiles in coaxial borehole heat exchangers
Applied Energy, 2013Ground source heat pump systems are often coupled to the ground by circulating a fluid through vertical Borehole Heat Exchangers (BHEs). The design of a system requires estimates of the ground thermal conductivity and the borehole thermal resistance, which are usually determined by an in situ thermal response test on a completed borehole.
Richard A. Beier +3 more
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Multi-Borehole Heat Exchanger Arrays
2016The focus of this chapter is the design and dimensioning of vertical bore ground heat exchangers (GHXs) coupled to heat pump applications. GHXs consist of multiple BHEs connected together. For example, residential buildings may require 3–5 vertical BHEs, while larger buildings such as schools may require tens to hundreds.
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Multipole method to calculate borehole thermal resistances in a borehole heat exchanger
HVAC&R Research, 2011Ground-source heat pump systems use borehole heat exchangers to transfer heat to and from the ground. An important feature is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. The counter-flow heat exchange between the pipes is also important, particularly for the axial temperature ...
Johan Claesson, Göran Hellström
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