Abstract
Having in sight the need for a strong reduction in CO2 emissions and the fluctuation of the price of fossil fuels, the ground source resources alongside with the ground source heat pumps are becoming more and more widespread for meeting the heating/cooling demand of several types of buildings. This article targets to develop the thermal modelling of borehole heat storage systems. Trying to emphasize some certain advantages of a GSHP (ground source heat pump) with vertical boreholes, a case study analysing a residential solar passive house is presented. The numerical results are produced using different modelling software like DesignBuilder, EED (Earth Energy Designer) and a sizing method for the length of the boreholes (ASHRAE method). The idea of sizing the length of boreholes (main design parameter and good index in estimating the system’s cost) using two different methods shows the reliability of this modelling tool. The study shows that borehole’s length of a GSHP system can trigger a difference in electricity consumption up to 22%. Moreover, this sensitivity analysis aims to prove that the design of the whole system can be done beforehand just using modeling tools, without performing tests in-situ.
Highlights
In the context of Paris agreement where the international community agreed that the average global temperature must not rise more than 2°C above the pre-industrial temperature in order to mitigate the effect of global warming and climate change, some strong climate actions need to be implemented and renewable energies must enlarge their use and applications.Energy use in buildings represents a major share of the overall energy used in developed countries
The results of the long-term borehole heat exchanger (BHE) simulations have been processed and compared in order to understand which is the relative importance of each parameter on the performances of the system (COP and consumption of electricity by the compressor of the ground source heat pumps (GSHPs)) and on the total length of the borehole
The length of the Borehole Heat Exchanger plays a crucial role in the design process, because it is responsible for almost half of the total installation cost of the GSHP [13], [14]
Summary
In the context of Paris agreement where the international community agreed that the average global temperature must not rise more than 2°C above the pre-industrial temperature in order to mitigate the effect of global warming and climate change, some strong climate actions need to be implemented and renewable energies (alongside geothermal resources) must enlarge their use and applications.Energy use in buildings represents a major share of the overall energy used in developed countries. Being part of geothermal renewable energy, ground source heat pumps (GSHPs) 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 thermo-hydrogeological properties of the surrounding soil) [1], [2]. This type of equipment (ground source heat pump on vertical borehole heat exchangers) is not used at a large scale in the whole world. 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. [3]
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