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Assessment of effective borehole thermal resistance from operational data
(International Ground Source Heat Pump Association, 2017)
Ground source heat pump (GSHP) systems use the ground as a source of sustainable thermal energy for heating and cooling of buildings. Efficient design of the ground heat exchangers (GHEs) for these systems is important so ...
Influence of different ground thermal properties in a borehole heat exchanger's performance using the B2G dynamic model
(International Ground Source Heat Pump Association, 2017)
Ground source heat pump (GSHP) systems for heating and cooling represent an efficient alternative to conventional air source heat pump systems, always provided that they present an efficient design and operation. In this ...
Alternate approach to the calculation of thermal response factors for vertical borehole ground heat exchanger arrays using an incomplete bessel function
(International Ground Source Heat Pump Association, 2017)
This article presents yet another methodology for the calculation of dimensionless thermal response factors for vertical borehole ground heat exchanger (GHX) arrays, which is a concept introduced by Eskilson (1987). The ...
Design and analytical analysis of foundation pile ground heat exchanger with spiral coils
(International Ground Source Heat Pump Association, 2017)
Recently, utilization of building foundation piles as the ground heat exchanger (GHE) received more and more attention since it can reduce the initial cost and land area requirement compared with the borehole GHE. This ...
Nanocomposite materials used for ground heat exchanger pipes
(International Ground Source Heat Pump Association, 2017)
This study compares the performance of single U-pipe, double U-pipe, and coaxial ground heat exchangers (GHE) equipped with standard HDPE and thermally enhanced (TE) pipes. Sizing calculations and 10-year hourly simulations ...
Thermal response of helix ground heat exchangers
(International Ground Source Heat Pump Association, 2017)
This paper is devoted to the thermal analysis of shallow ground heat exchangers with pipes arranged in a helix configuration. The pipes where the carrier fluid is circulated typically embrace a cylindrical volume that is ...
Transient thermal resistance of borehole heat exchangers for hourly simulations of geothermal heat pumps systems
(International Ground Source Heat Pump Association, 2017)
The correct design of borehole fields requires the correct evaluation of the transient ground thermal response in time, but also the accurate estimation of the borehole (BHE) thermal resistance, expecially the grout ...
Fast and accurate calculation of the soil temperature distribution around ground heat exchanger based on a response factor model
(International Ground Source Heat Pump Association, 2017)
Ground heat exchanger (GHE) is an important component of ground coupled heat pump system (GCHP). To calculate the soil temperature around GHE accurately and fast, a refined response factor model (RF model) is proposed. It ...
Numerical investigation on the thermo-mechanical behavior of a quadratic cross section pile heat exchanger
(International Ground Source Heat Pump Association, 2017)
Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical ...
High time-resolution analytical models for heat transfer through U-shaped ground heat exchangers
(International Ground Source Heat Pump Association, 2017)
This paper reports a set of high time-resolution analytical models for heat transfer of GHEs, including a full scale line-source model for heat transfer outside U-shaped pipes and a quasi-3D heat transfer model for the ...