Abstract
Geothermal energy is a renewable energy resource. Nowadays it can be considered as a promising alternative to various fossil fuels. Ground source heat pumps are efficient installations enabling the intensive use of underground energy for heating and cooling of modern residential and commercial buildings. However, climatic conditions often limit the use of this type of installation to a certain extent. This paper presents a description of an existing system comprising a liquid-toliquid heat pump and a geothermal field consisting of 4 boreholes. The system is used to investigate the intensity of ground temperature potential decrease in winter and its recovery in summer in the Moscow city environment with a detailed study of the properties of individual soil layers, as well as to study the mutual influence of boreholes on each other, represented by the conditional radius of thermal influence of individual boreholes. Graphs of soil temperature changes at different depths are presented.
Highlights
Today, a large proportion of the world's energy consumption is for the heating and cooling of buildings
The authors describe an existing thermal setup to study the reduction of ground thermal potential in winter and the thermal interaction between boreholes located at different distances from each other
The extraction of subsurface heat energy during long-term operation is accompanied by the effect of "cooldown" of the subsurface volume from which the heat is extracted. This effect means a gradual reduction in the temperature of the subsurface near the borehole walls, which entails a reduction in the heat extracted [6]. This effect is estimated by a conditional radius of thermal influence of the borehole, which increases over time
Summary
A large proportion of the world's energy consumption is for the heating and cooling of buildings. The study demonstrated that with each successive year of operation at the end of the heating period the ground heat energy consumption results in a decrease in the soil temperature around the heat exchanger, and this decrease in temperature couldn’t be fully compensated for during the summer period This effect of reducing the ground thermal potential in the Russian climate is found practically throughout the whole of Russia. The authors describe an existing thermal setup to study the reduction of ground thermal potential in winter and the thermal interaction between boreholes located at different distances from each other
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