Browsing OSU - IGSHPA Papers by Title
Now showing items 101-120 of 126
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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 ... -
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 ... -
Thermal Response Test experiments and modelling applied to shallow geothermal piles of different geometry
(International Ground Source Heat Pump Association, 2018)Geothermal piles are structural elements that encountered interest in ground source heat pump (GCHP) applications thanks to the great potential in cost reduction compared to the traditional solutions based on borehole heat ... -
Three dimensional numerical simulation of double-U pile heat exchangers
(International Ground Source Heat Pump Association, 2017)The Ground Source Heat Pump system with pile heat exchangers has been used in engineering in recent years. In this paper, a three-dimensional numerical model of double-U pile heat exchangers is established which was verified ... -
Transient heat transfer in ground heat exchangers under groundwater flow
(International Ground Source Heat Pump Association, 2022)An analytical solution for the transient heat transfer under groundwater flow for ground heat exchangers (GHEs) is presented. The method is an extension of the transient multipole expansion that describes the transient ... -
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 ... -
Uncertainty assessment of the hydraulics properties surrounding a standing column well with a thermal response test
(International Ground Source Heat Pump Association, 2022)The standing column well (SCW) is known for being a highly efficient ground heat exchanger as it relies on both conduction and advection heat transfer processes. Therefore, the interpretation of a thermal response test ... -
Underground thermal energy storage in subarctic climates: A feasibility study conducted in Kuujjuaq (QC, Canada)
(International Ground Source Heat Pump Association, 2018)Underground thermal energy storage can provide space and water heating and has been used in temperate climates so far. A step forward is to evaluate the efficiency and viability in arctic to subarctic environments, where ... -
Understanding transient heat transfer in large-scale ground heat exchanger (GHE) matrices: Insights from high-resolution analytical solutions
(International Ground Source Heat Pump Association, 2018)This paper reports on a set of high-resolution analytical solutions, which combines a composite-medium line-source solution, the conventional finite and infinite line-source solutions, and a quasi-3D model for fluid inside ...