OSU - IGSHPA Papers: Recent submissions
Now showing items 61-80 of 126
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Impact of a demand-side management strategy in operating a hybrid geo-district energy system for a high-rise mixed-use residential building in Toronto, Canada
(International Ground Source Heat Pump Association, 2018)In Ontario, Canada, the building thermal energy market is largely driven by the low cost of natural gas as a heating fuel source, with natural gas rates being approximately five times less per unit energy than electricity. ... -
Development and verification of control system for heat recovery ground source heat pump system
(International Ground Source Heat Pump Association, 2018)An operation method and control system for heat recovery ground source heat pump (HR-GSHP) systems have been developed. By applying the operation method and control system, the heating and cooling output from the respective ... -
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 ... -
Application of matched asymptotic expansion techniques to the analysis of geothermal heat exchangers
(International Ground Source Heat Pump Association, 2018)Most theoretical models for the thermal response of geothermal heat exchangers assume the mean azimuthal borehole wall temperature to be uniform along the boreholes. This simplifying assumption, closely related to the ... -
Field performance of a district central ground source heat pump system in the US
(International Ground Source Heat Pump Association, 2018)This case study discusses the field performance of a district central ground source heat pump (GSHP) system installed at Ball State University (BSU) in Muncie, IN., USA. This district GSHP system replaces the existing ... -
Video inspection of wells in open loop ground source heat pump systems in Norway
(International Ground Source Heat Pump Association, 2018)This paper presents results from video inspections of groundwater wells in Melhus and Elverum, in Norway. The method has identified iron hydroxides, bacterial growth and sand production as causes of clogging in different ... -
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 ... -
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) ... -
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 ... -
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 ... -
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 ... -
Financial assessment of ground source heat pump systems against other selected heating and cooling systems for Australian conditions
(International Ground Source Heat Pump Association, 2018)Ground source heat pump (GSHP) systems can provide cost-effective space heating and cooling for buildings while using less fossil fuel compared to many conventional systems. Despite these benefits, they typically have ... -
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 ... -
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 ... -
Full-scale model to predict borehole fluid temperature with groundwater advection
(International Ground Source Heat Pump Association, 2018)Ground source heat pump (GSHP) system is one of the major techniques that utilize shallow geothermal energy and borehole heat exchangers (BHEs) is the key component in GSHP system. Although most proposed analytical models ... -
G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations
(International Ground Source Heat Pump Association, 2018)A semi-analytical method based on the finite line source (FLS) solution is presented to evaluate thermal response factors for geothermal bore fields with mixed series and parallel connections between boreholes. Each borehole ... -
Upgrade of the B2G dynamic geothermal heat exchanger model: Optimal location of the ground nodes
(International Ground Source Heat Pump Association, 2018)In order to optimize the design and operation of a ground source heat pump system, the modeling of the Borehole Heat Exchanger (BHE) and its coupling to the heat pump operation becomes crucial. This becomes key for those ... -
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 ... -
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 ...