Browsing OSU - IGSHPA Papers by Issue Date
Now showing items 1-20 of 126
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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 ... -
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 ... -
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 ... -
Heat extraction distributed thermal response test: A methodological approach and in-situ experiment
(International Ground Source Heat Pump Association, 2017)The Thermal Response Test (TRT) is a worldwide adopted in-situ methodology able to estimate the ground thermal conductivity and borehole thermal resistance. During the test the carrier-fluid exchanges a constant heat flux ... -
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 ... -
Energy performance evaluation of a recycled water heat pump system in cool and dry climate zone
(International Ground Source Heat Pump Association, 2017)This paper presents performance evaluation results for a recycled water heat pump (RWHP) system, which uses the recycled water from a municipal water system as a heat sink and heat source for heat pumps. The temperature ... -
Effect of an off-peak ground pre-cool control strategy on hybrid ground-source heat pump systems
(International Ground Source Heat Pump Association, 2017)Hybrid Ground-Source Heat Pump (HGSHP) systems have been introduced as an alternate system configuration to remedy the current financial hurdles associated to the installation of geo-exchange technology. However, there ... -
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 ... -
Coupled heating optimization of hybrid GCHP system with heat compensation unit
(International Ground Source Heat Pump Association, 2017)The coupled HCUT-GCHP system (integrating the GCHP with the efficient heat compensation unit (HCUT)) can operate in heat compensation mode and coupled heating mode to effectively eliminate the soil thermal imbalance 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 ... -
Analytical solution for optimal mass flow rate in primary circuit of ground-coupled heat pump systems
(International Ground Source Heat Pump Association, 2017)Ground source heat pump (GSHP) systems extract heat or cold from the ground by circulating a heat carrier uid (HCF) in a ground heat exchanger and inject this energy in buildings. This paper shows that there exists an ... -
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 ... -
Vertical GSHP systems in Sweden 1978-2015 - A survey based on the Swedish Well Database
(International Ground Source Heat Pump Association, 2017)The Geological Survey of Sweden (SGU) is the Swedish government agency responsible for groundwater, geological and mineral management in Sweden. SGU provides open access geological data on rock, soil and groundwater ... -
First measurements of a monitoring project on a BTES system
(International Ground Source Heat Pump Association, 2017)Performance of Borehole Thermal Energy Storage (BTES) systems depends on the temperature of the secondary fluid, circulating through the ground-loop heat exchangers. Borehole systems are therefore designed in order to ... -
Investigation on the effects of different time resolutions in the design and simulation of BHE fields
(International Ground Source Heat Pump Association, 2017)The correct design of a field of Borehole Heat Exch angers (BHE) requires the knowledge of ground thermal properties, heat pump performance and building heating and cooling demand. The sequence o f heat pulses from (to) ... -
Direct expansion ground source heat pump using carbon dioxide as refrigerant: Test facility and theoretical model presentation
(International Ground Source Heat Pump Association, 2017)In an attempt to address recent challenges on using natural refrigerants and to develop further knowledge and expertise in the field of direct expansion ground source heat pump (DX-GSHP), an experimental transcritical ...