Abstract
The paper presents the ground temperature analysis, heat flows and energy transferred from the soil massif by the vertical ground heat exchangers (VGHE). Three cases – with one, two and three vertical heat exchangers were compared. Their influences on the soil massif temperature in the heat exchangers area were shown. The mass flow and the temperature at the inlet and outlet side of the heat pump were measured in each circuit. Additional, the electricity consumption by the heat pump and energy supply to buffer vessel were measured. Finally, the Coefficient of Performance (COP) as a function of length of VGHE is shown for selected interval time.
Highlights
The geothermal energy is one of the most reliable and stable renewable energy resources in the world
Commercial application of the geothermal energy noticeably increases with various types of ground heat exchangers compatible with ground source heat pumps systems (GSHP)
In engineering practice the vertical ground heat exchangers (VGHE) is usually constructed by inserting high-density polyethylene (HDPE) U-tube in a vertical borehole to serve as the ground loop, which is referred to a single U-tube Ground heat exchanger (GHE)
Summary
The geothermal energy is one of the most reliable and stable renewable energy resources in the world. Ground heat exchanger (GHE) is one of the most important component for the effective utilization of geothermal energy [1]. Compared the low-potential energy sources for heat pump, from performance and economical parameters of the air, horizontal and vertical GHE the maximum output can be achieved by VGHE technology [2]. Vertical ground heat exchangers have a great energy-saving potential, but ground heat storage has not been fully developed yet [11]. This undesirable side effect is mainly due to difficulties in the design and analysis of GHE, which involves complex heat transfer calculations. Further research on the thermal process of VGHE is crucial
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