In order to contribute to a global CO 2 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 direction, Ground Source Heat Pump (GSHP) systems are generally recognized as one of the most energy-efficient compared to air source heat pump systems. However, this strongly depends on the temperature evolution of the air and the ground during the year, which also depends on the geographical location of the system. Therefore, an optimal system from the energy point of view apparently would be the one that is able to switch from one source to the other in order to operate the heat pump with the highest efficiency.
In this context, a new Dual Source Heat Pump (DSHP) unit for heating, cooling and production of domestic hot water, was developed and manufactured in the framework of a H2020 European project called GEOT€CH (Geothermal Technology for €conomic Cooling and Heating
In order to optimize the operation of a ground source heat pump (GSHP) system, the development of dynamic models that integrate all the system components is a key factor. Particularly, the modelling of the ground source heat exchanger and its coupling to the heat pump operation becomes important.
Usually, this kind of systems present an on/off operation, which makes it necessary to have an accurate prediction of both the short and long thermal response of the borehole heat exchanger (BHE). In this context, the novel B2G dynamic model was developed and experimentally validated in previous works for a single U-loop BHE.
This work presents the adaptation and experimental validation of the B2G dynamic model to a novel co-axial spiral BHE configuration designed in the framework of a HORIZON 2020 European Project, GEOT€CH (Geothermal Technology for €conomic Cooling and Heating).The results show that the B2G approach applied to this specific configuration produces a model that can accurately predict the behavior of the BHE.
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 systems with on/off operation, where it is important to model the short-term response of the BHE accurately. Furthermore, the modeling of the local variation of the ground temperature near the BHE will be highly influenced by ground thermal properties and the operation of the system. In this context, the novel B2G dynamic model was developed and experimentally validated in previous works for a single U BHE and adapted to a novel coaxial spiral configuration. In order to consider the influence of the soil surrounding the BHE, two ground nodes were initially defined and their position (penetration radii) was calculated for a specific type of soil and operating conditions. This paper presents an upgrade of the B2G model, with a descripton of penetration radii calculation. For this purpose, a comparison between the B2G model and the Infinite Cylindrical Source model was carried out to find the penetration radii that reproduce the ground thermal response with a higher accuracy under the corresponding soil thermal properties and operating conditions.
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