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Performance Analysis of Borehole U-tube Heat Exchanger Based on TRNSYS Software
  • P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2020, Volume: 13, Issue: 5, Pages: 539 – 551

Original Article

Performance Analysis of Borehole U-tube Heat Exchanger Based on TRNSYS Software


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.


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