Abstract
Background/objectives: There exist many alternatives to store thermal energy for handling the seasonal offset. Among these alternatives, a borehole heat exchanger is better for storage of the thermal energy. Methods: In this work, the comparison of the performance of two boreholes U-tube models has been presented. The first one is double U buried pipes and the second one is single U buried pipes with a diameter of 25 mm and 32 mm, respectively. The performance is evaluated by the numerical method and analysis is done by using TRNSYS software. This investigates the thermal functioning of ground heat exchangers by constant inlet water temperatures and different borehole depths. Both single-U and double-U have the same depths but different diameters and sensors of both boreholes are integrated into the circle to measure the temperature. Findings and novelty/improvements: The results demonstrate that temperature increases in 105 m depth, this depth of borehole is quite deep. It is also showed that the average thermal conductivity is 1.446 W/m °C; the average thermal diffusivity is 0.730 × 10-6 m2/s although the optimum velocity range is 0.3–0.6 m/s. Furthermore, the results show that a single U buried pipe with a large space should be used. The distance between buried pipes must be 5 m. Special attention should pay to the backfilling methods, backfilling construction, and backfilling materials of buried pipes. Keywords: Borehole, Heat Exchanger, Underground Storage, TRNSYS.
Highlights
Renewable energy technologies continue to spread through the continuous expansion of life and science
Energy piles are based on the mixture of borehole heat exchangers and deep systemic support structures
The results of the test showed that the average thermal conductivity is 1.446 W/m °C
Summary
Renewable energy technologies continue to spread through the continuous expansion of life and science. The distribution of renewable energy resources is wider than the imperfect predictable energy resources and the environment is essentially safe and never-ending. One of those renewable energy resources the borehole heat exchanger [1]. The operation of the system based on underground conditions including a ground-source heat pump (GSHP). Energy piles are based on the mixture of borehole heat exchangers and deep systemic support structures. Energy pile technologies have been recently produced and are increasingly in demand for both forms of the heat exchanger and underground piles of geothermal energy due to their energy efficiency and financial gain [3]. The effectiveness of medium depth borehole thermal energy storage improves with volume but it takes many years to achieve operational capability, and such systems are useful in urban regions due to the low demand for floor space [4]
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