Browsing OSU - IGSHPA Papers by Title
Now showing items 93-112 of 126
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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 ... -
Randomly fractal approach to calculate the thermal conductivity of moist soil
(International Ground Source Heat Pump Association, 2018)Ground coupled heat pump (GCHP) is an energy saving technology that uses the shallow geothermal energy for the building heating and refrigeration systems. An optimized design of ground heat exchangers (GHEs) is the key to ... -
Seasonal performance assessment of a dual source heat pump system for heating, cooling and domestic hot water production
(International Ground Source Heat Pump Association, 2018)In order to contribute to a global CO2 emissions reduction in 2020, the increase in the use of highly efficient heat pumps for heating, cooling and domestic hot water production in buildings is very recommendable. In this ... -
Second-order multipole formulas for thermal resistance of single U-tube borehole heat exchangers
(International Ground Source Heat Pump Association, 2017)The borehole thermal resistance is both an important design parameter and a key performance characteristic of a borehole heat exchanger. Another quantity that is particularly important for deep borehole heat exchangers is ... -
Simulated temperature evolution of large BTES - case study from Finland
(International Ground Source Heat Pump Association, 2018)The largest borehole thermal energy storage system in Finland (also one of the largest systems in Europe) is located in Sipoo, Southern Finland. The system produces heating and cooling energy for a large logistics centre ... -
Soil thermal conductivity from early TRT logs using an active hybrid optic fibre system
(International Ground Source Heat Pump Association, 2018)At the Molinella test site in Italy, a monitoring well has been equipped with a hybrid active optical fibre cable down to the depth of 100 m sealed with geothermal grouting. The cored borehole provided a full stratigraphic ... -
Stationary and non-stationary deconvolution to recover long-term transfer functions
(International Ground Source Heat Pump Association, 2022)To design a ground heat exchanger, simulations are frequently used. One way to perform simulations is to use the well-known g-functions to obtain the ground temperature. These functions are usually obtained by analytical ... -
Storage of solar thermal energy in borehole thermal energy storage systems
(International Ground Source Heat Pump Association, 2017)This study focuses on the evaluation of solar thermal energy storage in a medium-scale soil-borehole thermal energy storage (SBTES) system installed in San Diego, CA. The SBTES system consists of an array of thirteen 15 ... -
Technical and economic evaluation of a ground source heat pump with thermal and battery energy storage systems for residential dwellings in Quebec
(International Ground Source Heat Pump Association, 2022)Ground source heat pump (GSHP) systems have been identified as promising solutions to help buildings achieve future carbon neutral targets. However, two main barriers decelerate the wide adoption of this technology in every ... -
Temperature profile measurements - easy, cheap and informative
(International Ground Source Heat Pump Association, 2018)Regular thermal response tests (TRT) are routinely performed to get data for sizing larger installations with borehole heat exchangers. The effective borehole thermal conductivity and the effective borehole thermal resistance ... -
Thermal analysis models of deep borehole heat exchangers
(International Ground Source Heat Pump Association, 2018)With the advantages of much less land demand and higher temperature available, the deep borehole heat exchanger (DBHE) gets down to a depth of 1000-3000 m below the ground surface, and provides a new variance of ground-coupled ... -
Thermal influence of neighbouring GSHP installations: Relevance of heat load temporal resolution
(International Ground Source Heat Pump Association, 2018)In densely populated areas where many ground source heat pump (GSHP) systems are present, it becomes important to consider the thermal influence of neighbouring GSHP installations while designing these systems. This question ... -
Thermal performance evaluation of horizontal spiral coil-type ground heat exchangers
(International Ground Source Heat Pump Association, 2018)Geothermal energy has been widely used over the world instead of fossil fuel for environmental merits. A ground-source heat pump (GSHP) system utilizes a constant ground temperature to absorb heat during winter and to emit ...