Browsing OSU - IGSHPA Papers by Title
Now showing items 74-93 of 126
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Machine-learning-based models for predicting the performance of ground-source heat pumps using experimental data from a residential smart home in California
(International Ground Source Heat Pump Association, 2022)Ground-source heat pumps (GSHP) reject (extract) heat to a lower (higher) temperature sink (source) as compared with air-source heat pumps which allows them to operate more efficiently. With the rapid development in the ... -
Measurement of internal and effective borehole resistances during thermal response tests
(International Ground Source Heat Pump Association, 2017)In a conventional thermal response test (TRT), the main parameter evaluated is the bulk subsurface thermal conductivity surrounding the borehole. It is also possible to evaluate the borehole thermal resistance. Several ... -
Minimum well separation for small groundwater heat pump (GWHP) systems in Korea: Preliminary analysis based on regional aquifer properties
(International Ground Source Heat Pump Association, 2017)Shallow geothermal energy has been estimated to have an excellent applicability in Korea, and its applications for space heating and cooling have steadily increased in recent years. Such application as ground source heat ... -
Model for ground temperature estimations and its impact on horizontal ground heat exchanger design
(International Ground Source Heat Pump Association, 2017)The ground-source heat pump systems are highly efficient and energy saving. Its main disadvantage is a significantly higher installation cost compared to conventional systems. The length of the ground heat exchanger (GHX) ... -
Model predictive control applied to residential self-assisted ground source heat pumps
(International Ground Source Heat Pump Association, 2018)The seasonal performance and feasibility of a "self-assisted" ground source heat pump system are examined. The system uses an electric heating element to inject heat into the ground and reduce peak energy demand by eliminating ... -
Modeling and performance evaluation of fractured thermal energy storage (FTES)
(International Ground Source Heat Pump Association, 2022)Fractured thermal energy storage (FTES) is an open-loop type system that uses hydraulically propagated horizontal fracture planes for storage and extraction of heat in low-permeability hard rock formations. Groundwater ... -
Modelling and experimental validation of a novel co-axial spiral borehole heat exchanger
(International Ground Source Heat Pump Association, 2017)In order to optimize the operation of a ground source heat pump (GSHP) system, the development of dynamic models that integrate all the system components is a key factor. Particularly, the modelling of the ground source ... -
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. ...