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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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Geotechnical considerations in the design of borehole heat exchangers
Canadian Geotechnical Journal, 2021The use of ground source heat pumps to transfer heat to and from the ground via borehole heat exchangers (BHEs) is among the most energy efficient techniques for space heating and cooling. Broader applications in urban environments require more careful evaluation of hydro-mechanical behavior of soil to ensure their reliable long-term performance and ...
Zymnis, Despina Maria +1 more
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Transient heat transfer in a coaxial borehole heat exchanger
Geothermics, 2014Ground-source heat pumps often use vertical boreholes to exchange heat with the ground. A transient heat transfer model has been developed for a thermal response test on a pipe-in-pipe coaxial borehole heat exchanger. The analytical model calculates the vertical temperature profiles in the fluid flowing through the pipes, which are coupled to the ...
Richard A. Beier +3 more
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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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An analysis of heat flow through a borehole heat exchanger validated model
Applied Energy, 2012Abstract Earth heat exchangers are essential parts of the ground-source heat pumps and the accurate prediction of their performance is of fundamental importance. This paper presents the development and validation of a numerical model for the simulation of energy flows and temperature changes in and around a borehole heat exchanger when a fluid ...
Florides, Georgios A. +2 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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