Browsing OSU - IGSHPA Papers by Title
Now showing items 81-100 of 126
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Modelling of alternative borehole configurations for geo-exchange
(International Ground Source Heat Pump Association, 2017)During the operation of a ground source heat pump (GSHP), the ground acts as a heat sink and heat source in cooling and heating modes, respectively. When the heating and cooling loads are extremely unbalanced, ground ... -
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 ... -
Near-instant g-function construction with artificial neural networks
(International Ground Source Heat Pump Association, 2018)A g-function is a useful tool that simplifies the calculations of heat exchanges in a ground-coupled heat pump system. In this work, we show how an artificial neural network can be trained to construct a g-function with ... -
New methods to spatially extend thermal response test assessments
(International Ground Source Heat Pump Association, 2017)Thermal response tests (TRTs), used to evaluate the subsurface thermal conductivity when designing ground source heat pump systems, are spatially limited to the vicinity of the borehole where a test is carried out. The ... -
Newton-Raphson method applied to the time-superposed ILS for parameter estimation in Thermal Response Tests
(International Ground Source Heat Pump Association, 2018)Thermal Response Testing is now a well-known and widely-used method allowing the determination of the local thermal or geometrical properties of a Borehole Heat Exchanger (BHE), those properties being critical in the design ... -
Novel tool and guidelines for ground source heat pumps in densely populated areas: a Swedish project
(International Ground Source Heat Pump Association, 2022)With one system installed for every twenty inhabitants, Sweden is by far the country with the highest penetration of Ground Source Heat Pumps (GSHPs). Unsurprisingly, it has initiated a project to support designers and ... -
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 ... -
Numerical simulation of pile geothermal heat exchanger with spiral tube considering its thermo-mechanical behavior
(International Ground Source Heat Pump Association, 2017)Pile geothermal heat exchanger (PGHE), which utilizes the building foundation piles as part of the geothermal heat exchangers (GHEs) for a ground-coupled heat pump (GCHP) system, has been attracting the interests of ... -
Numerical simulation of slinky-coil ground heat exchangers installed in railway tunnels
(International Ground Source Heat Pump Association, 2018)The use of horizontal ground heat exchangers (HGHEs) greatly reduces the initial cost of GSHP systems in comparison with vertical GHEs. Though the HGHEs are commonly used in North American countries, the installation number ... -
On the role of vertical ground heat flux for analytical simulation of borehole heat exchangers
(International Ground Source Heat Pump Association, 2018)Analytical modelling techniques are frequently used for prediction of the impacts of borehole heat exchangers (BHEs) on the thermal conditions in the subsurface. They are appealing because they are easy to use, compact and ... -
Open library of g-functions for 34,321 configurations
(International Ground Source Heat Pump Association, 2022)Thermal response functions, known as g-functions, are commonly used in ground heat exchanger design tools and whole building energy simulation programs to simulate the ground heat exchanger performance. Calculation of ... -
Optimal control and operation of a GSHP system for heating and cooling in an office building
(International Ground Source Heat Pump Association, 2017)Ground source heat pump (GSHP) systems are widely considered as being among the most efficient heating and cooling renewable technologies currently available. Nevertheless, both an optimal design of components and an optimal ... -
Parameters optimization of ground source heat pump system combined energy consumption and economic analysis using Taguchi method
(International Ground Source Heat Pump Association, 2018)In order to obtain a high performance and low cost of ground source heat pump (GSHP) system, a methodology based on Taguchi method and analysis of variance (ANOVA) is used to optimize design parameters of GSHP systems. ... -
Performance analysis of a single underground thermal storage borehole using phase change material
(International Ground Source Heat Pump Association, 2018)Ground source heat pumps (GSHP) are used to provide both heating and cooling to a given system. These heat pumps transfer heat efficiently between the system and the ground. Despite this high efficiency, there has been a ... -
Potential mapping of ground source heat pump systems considering groundwater pumping
(International Ground Source Heat Pump Association, 2022)The pumping of groundwater near GHEs improves the performance of GSHP systems due to the advection of the induced roundwater flow when the hydraulic conductivity of the formation is favorable. To quantify the effect, we ... -
Preliminary research for eight possible groundwater energy utilisation sites in Southern Finland
(International Ground Source Heat Pump Association, 2018)Groundwater energy utilisation has not been widely regognised as a significant renewable energy source for industry in Finland. This investigation provides example of cost-effective study to map groundwater energy utilisation ... -
Properties of different ethyl alcohol based secondary fluids used for GSHP in Europe and USA
(International Ground Source Heat Pump Association, 2017)The extensive use of ground source heat pumps (GSHP) for heating and cooling purposes has made Sweden the European leader in geothermal energy utilization, in terms of the installed capacity, as well as extracted thermal ... -
Providing low carbon cooling through pile foundations; the effect of thermal cycling on clay strength
(International Ground Source Heat Pump Association, 2017)Pile foundations provide a low-intrusive mechanism for installing heat exchangers into the ground, especially if the piles are being installed to support the building. The ground temperature is relatively constant at depths ... -
Pulsated Thermal Response Test experiments and modelling for ground thermal property estimation
(International Ground Source Heat Pump Association, 2018)The Thermal Response Test (TRT) is a well known experimental technique for estimating both the ground thermal conductivity and the effective borehole heat exchangers (BHE) resistance in ground coupled heat pump (GCHP) ... -
pygfunction 2.2 : New features and improvements in accuracy and computational efficiency
(International Ground Source Heat Pump Association, 2022)Recent improvements to pygfunction, an open-source tool for the calculation of ??-functions, are presented. The latest version 2.2 enables the calculation of ??-functions for fields containing inclined boreholes. Various ...