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Abstract
Underground energy sources are becoming increasingly popular and now geothermal heat pumps are frequently used to heat/cool different types of buildings, including for solar passive houses. This article aims at giving a contribution in the development of the thermal modelling of borehole heat storage systems, investigating the possibility of a GSHP (ground source heat pump) implementation with vertical boreholes in a solar passive house. A case study analysing a residential solar passive house is presented as a suitable modelling tool for the estimation of the thermal behaviour of GSHP systems by combining the outcome from different modelling programs. The software DesignBuilder, Earth Energy Designer and a sizing method for borehole’s length are used for producing the numerical results. The results highlight that the length of the borehole, a major index in estimating the system’s cost, is directly influenced by fundamental variables like thermal conductivity of grout or soil. Additionally, correlations between these parameters and the coefficient of performance of GSHP were made. Furthermore, the length of borehole is very important as it is responsible for almost half of the total installation cost and triggered a difference in electricity consumption of the GSHP up to 14%.
Highlights
Considering the instability of the price of fossil fuels and the need for a strong reduction in CO2 emissions, in the context of increased global awareness and in the context of the European Union taking strong action by 2020 to mitigate the effects of climate change, renewable energies will expand their use and applications
After assessing the needed length of the borehole heat exchanger for heating/cooling the Efden house and for its location and after the introduction of the detailed HVAC system with the help of DesignBuilder, the goal was to make a comparison by analysing different types of soil, different HDPE pipes, different filling materials, different length and number of boreholes in order to see their influence on electricity consumption of the GSHP for heating
These results are obtained by doing various simulations of the house in DesignBuilder
Summary
Considering the instability of the price of fossil fuels and the need for a strong reduction in CO2 emissions, in the context of increased global awareness and in the context of the European Union taking strong action by 2020 to mitigate the effects of climate change, renewable energies (alongside geothermal resources) will expand their use and applications. There are many countries, some even in Europe, where these types of equipment are often not considered in the design of a building due to lack of studies, information, available examples and insufficient cost analyses. Energy use in buildings represents a major share of the overall energy used in developed countries. Ground source heat pumps are efficient systems to supply heating and cooling energy to buildings, but their design is critical for their performance. Their performance depends on the cooling and heating demand and on the environmental conditions (geometric and physical properties of its components and the thermohydrogeological properties of the surrounding soil) [1, 2]
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