Indian Journal of Science and Technology
DOI: 10.17485/ijst/2020/v13i05/148618
Year: 2020, Volume: 13, Issue: 5, Pages: 539 – 551
Original Article
Ala Eldin Mohamed Tairab*, Wei Liu, Ateeq Ur Rehman, Inam Ullah and Kamdem Claude
College of Mechanical and Electrical Engineering, Hohai University, Changzhou Campus, China
*Author for correspondence:
Ala Eldin Mohamed Tairab
Hohai University, Changzhou Campus, China
E-mail ID: terab2017@outlook.com
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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