OSU - IGSHPA Papers: Recent submissions
Now showing items 41-60 of 126
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Double source heat pump: A case study
(International Ground Source Heat Pump Association, 2018)The design of a Ground Source Heat Pump (GSHP) system is critical because design choices affect the system's energy performance and operating conditions. If the thermal load profile on the ground side is unbalanced the ... -
Comparison of two simplified approaches for ground temperature estimations in Australia
(International Ground Source Heat Pump Association, 2018)Developing an accurate and practical method for ground temperature estimations are critical for the ground source heat pump system design and energy calculation procedures. In Australia, Baggs' method is a common procedure ... -
Foundation wall heat exchanger model and validation study
(International Ground Source Heat Pump Association, 2018)Making use of foundation substructural elements as ground heat exchangers is an attractive option for larger non-residential buildings. An alternative to Energy Piles is to use wall substructures - so called diaphragm or ... -
Design and simulation tool for ground source heat pump systems considering groundwater advection
(International Ground Source Heat Pump Association, 2018)Calculation of the underground temperature resulting from heat injection/extraction into/from ground heat exchangers (GHEXs) with hourly variation is one of the most noteworthy challenges to address when simulating and ... -
Experimental setup to measure the heat-exchange processes by controlling thermal and hydraulic conditions
(International Ground Source Heat Pump Association, 2018)The design of a Borehole Heat Exchanger (BHE) is based on the evaluation of the thermal exchange capacity of the whole system constituted by the probes and the surrounding ground. The energy performance of a BHE mainly ... -
Extending the Ashrae Tp8 method for vertical borefield design to uniform BHE temperature boundary conditions
(International Ground Source Heat Pump Association, 2018)The Ashrae method is a fast algorithm for calculating the overall length of closed-loop borehole heat exchangers, considering the ground thermal response and the building thermal load profile. The method includes a corrective ... -
Impacts of injection temperature on the relevant heat transport processes in groundwater heat pump (GWHP) systems
(International Ground Source Heat Pump Association, 2018)In many hydrogeological applications, the influence of temperature on fluid density and viscosity have often been neglected. However, high contrasts in temperature which occurs in the field applications such as groundwater ... -
Virtual borehole for thermal response test unit calibration: Test facility and concept development
(International Ground Source Heat Pump Association, 2018)Precise calculation of the borehole length requires good estimation of the ground thermal conductivity. In practice, the ground thermal conductivity is measured in-situ at a specific location using what is referred to as ... -
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 ... -
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 ... -
Are shallow boreholes a suitable option for inter-seasonal ground heat storage for the small housing sector?
(International Ground Source Heat Pump Association, 2018)In recent years, various researchers have studied the performance of Solar Assisted Ground Source Heat Pump (SAGSHP) systems using borehole heat exchangers. However, the research conducted has been limited to conventional ... -
Development of a thermal conductivity map of Stockholm
(International Ground Source Heat Pump Association, 2018)New methods have been suggested to spatially extend in situ thermal response test (TRT) assessments based on geostatistical analysis. These methods can be used to determine a stochastic distribution of the subsurface thermal ... -
Design of a laboratory borehole storage model
(International Ground Source Heat Pump Association, 2018)This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS is intended to generate reference Thermal Response Functions (TRFs) as well as ... -
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 ... -
High temperature borehole thermal energy storage - A case study
(International Ground Source Heat Pump Association, 2018)Combining High-Temperature Borehole Thermal Energy Storages (HT-BTES) with existing Combined Heat and Power (CHP) systems running on waste fuels seems to be a promising approach to increase the energy efficiency of district ... -
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 ... -
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 ... -
Vertical hydraulic conductivity of borehole heat exchanger systems before and after freeze-thaw cycle stress
(International Ground Source Heat Pump Association, 2018)Quality assurance is a very important aspect in the planning, implementation and operation of borehole heat exchangers (BHE). Within the research project Quality Assurance for Borehole Heat Exchangers (QEWS) the hydraulic ... -
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 ... -
Geothermal storage integration into supermarket's CO2 refrigeration system
(International Ground Source Heat Pump Association, 2018)This paper investigates the integration of geothermal storage into the state-of-the-art CO2 trans-critical booster systems. The objective is to evaluate the impact on energy efficiency of this integration. Three scenarios ...