Comparison of axial and radial soil temperature distribution in U-tube and coaxial borehole heat exchangers

Document Type : Research Article

Authors

1 Professor of departement of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

2 Department of mechanical engineering, Iran university of science and technology

Abstract

Dynamic variation of surrounding soil temperature in axial (depth) and radial directions of vertical type geothermal heat pump (heat exchangers are investigated here. This soil temperature distribution for borehole heat exchangers plays an important role in thermal operation, electricity consumption and coefficient of performance of geothermal heat pump. Thus the transient 3-dimensional numerical modeling of U-tube and coaxial borehole heat exchangers are investigated to find the temperature distribution around the buried pipes. The simulation is performed using ANSYS FLUENT 16.0 software based on the finite volume method. The effects of various parameters are studied and modeling results for the cooling application of heat pump are obtained for different mass flow rates of condenser cooling water. Results show that the injection heat transfer rate to the ground in summer, in the coaxial borehole heat exchanger at mass flow rates of 0.8, 1, 1.2 kg/s are 5.34%, 11.9%, 16.5% higher than U-tube borehole heat exchanger respectively. Moreover, after 93 days, the vertical temperature distribution of the soil for U-tube heat exchanger shows a significant variation mainly at depths less than 36.6 meters while the coaxial heat exchanger greatly affects the soil temperature distribution even in higher depths.

Keywords

Main Subjects

References

[1] L. Pu, D. Qi, K. Li, H. Tan, Y. Li, Simulation study on the thermal performance of vertical U-tube heat exchangers for ground source heat pump system, Applied Thermal Engineering, 79 (2015) 202-213.
[2] S.A. Alkaff, S. Sim, M.E. Efzan, A review of underground building towards thermal energy efficiency and sustainable development, Renewable and Sustainable Energy Reviews, 60 (2016) 692-713.
[3] M.B. Jebli, S.B. Youssef, Output, renewable and non-renewable energy consumption and international trade: Evidence from a panel of 69 countries, Renewable Energy, 83 (2015) 799-808.
[4] P. Bayer, G. Attard, P. Blum, K. Menberg, The geothermal potential of cities, Renewable and Sustainable Energy Reviews, 106 (2019) 17-30.
[5] K. Wang, B. Yuan, G. Ji, X. Wu, A comprehensive review of geothermal energy extraction and utilization in oilfields, Journal of Petroleum Science and Engineering, 168 (2018) 465-477.
[6] P. Olasolo, M. Juárez, M. Morales, I. Liarte, Enhanced geothermal systems (EGS): A review, Renewable and Sustainable Energy Reviews, 56 (2016) 133-144.
[7] Y. Noorollahi, R. Saeidi, M. Mohammadi, A. Amiri, M. Hosseinzadeh, The effects of ground heat exchanger parameters changes on geothermal heat pump performance–A review, Applied Thermal Engineering, 129 (2018) 1645-1658.
[8] G. Florides, E. Theofanous, I. Iosif-Stylianou, S. Tassou, P. Christodoulides, Z. Zomeni, E. Tsiolakis, S. Kalogirou, V. Messaritis, P. Pouloupatis, Modeling and assessment of the efficiency of horizontal and vertical ground heat exchangers, Energy, 58 (2013) 655-663.
[9] M.A. Rosen, S. Koohi-Fayegh, Geothermal energy: Sustainable heating and cooling using the ground, John Wiley & Sons, 2017.
[10] G. Florides, S. Kalogirou, Ground heat exchangers—A review of systems, models and applications, Renewable energy, 32(15) (2007) 2461-2478.
[11] L. Aresti, P. Christodoulides, G. Florides, A review of the design aspects of ground heat exchangers, Renewable and Sustainable Energy Reviews, 92 (2018) 757-773.
[12] Y.-L. Nian, W.-L. Cheng, X.-Y. Yang, K. Xie, Simulation of a novel deep ground source heat pump system using abandoned oil wells with coaxial BHE, International Journal of Heat and Mass Transfer, 137 (2019) 400-412.
[13] H. Javadi, S.S.M. Ajarostaghi, M.A. Rosen, M. Pourfallah, Performance of ground heat exchangers: A comprehensive review of recent advances, Energy,  (2019).
[14] Q. Zhao, B. Chen, M. Tian, F. Liu, Investigation on the thermal behavior of energy piles and borehole heat exchangers: A case study, Energy, 162 (2018) 787-797.
[15] W. Zhang, H. Yang, L. Lu, Z. Fang, Investigation on influential factors of engineering design of geothermal heat exchangers, Applied Thermal Engineering, 84 (2015) 310-319.
[16] E. Zanchini, A. Jahanbin, Effects of the temperature distribution on the thermal resistance of double u-tube borehole heat exchangers, Geothermics, 71 (2018) 46-54.
[17] X.-Y. Li, T.-Y. Li, D.-Q. Qu, J.-W. Yu, A new solution for thermal interference of vertical U-tube ground heat exchanger for cold area in China, Geothermics, 65 (2017) 72-80.
[18] X. Zhai, X. Cheng, R. Wang, Heating and cooling performance of a minitype ground source heat pump system, Applied Thermal Engineering, 111 (2017) 1366-1370.
[19] A.A. Serageldin, Y. Sakata, T. Katsura, K. Nagano, Thermo-hydraulic performance of the U-tube borehole heat exchanger with a novel oval cross-section: Numerical approach, Energy conversion and management, 177 (2018) 406-415.
[20] S. Gharibi, E. Mortezazadeh, S.J.H.A. Bodi, A. Vatani, Feasibility study of geothermal heat extraction from abandoned oil wells using a U-tube heat exchanger, Energy, 153 (2018) 554-567.
[21] S.-J. Cao, X.-R. Kong, Y. Deng, W. Zhang, L. Yang, Z.-P. Ye, Investigation on thermal performance of steel heat exchanger for ground source heat pump systems using full-scale experiments and numerical simulations, Applied Thermal Engineering, 115 (2017) 91-98.
[22] F. Tang, H. Nowamooz, Factors influencing the performance of shallow Borehole Heat Exchanger, Energy conversion and management, 181 (2019) 571-583.
[23] H. Javadi, S.S.M. Ajarostaghi, M. Pourfallah, M. Zaboli, Performance analysis of helical ground heat exchangers with different configurations, Applied Thermal Engineering, 154 (2019) 24-36.
[24] L. Zhu, S. Chen, Y. Yang, Y. Sun, Transient heat transfer performance of a vertical double U-tube borehole heat exchanger under different operation conditions, Renewable Energy, 131 (2019) 494-505.
[25] E. Zanchini, A. Jahanbin, Correlations to determine the mean fluid temperature of double U-tube borehole heat exchangers with a typical geometry, Applied energy, 206 (2017) 1406-1415.
[26] H. Mokhtari, H. Hadiannasab, M. Mostafavi, A. Ahmadibeni, B. Shahriari, Determination of optimum geothermal Rankine cycle parameters utilizing coaxial heat exchanger, Energy, 102 (2016) 260-275.
[27] X. Hu, J. Banks, L. Wu, W.V. Liu, Numerical modeling of a coaxial borehole heat exchanger to exploit geothermal energy from abandoned petroleum wells in Hinton, Alberta, Renewable Energy, 148 (2020) 1110-1123.
[28] H. Holmberg, J. Acuña, E. Næss, O.K. Sønju, Thermal evaluation of coaxial deep borehole heat exchangers, Renewable Energy, 97 (2016) 65-76.
[29] H. Tang, B. Xu, A.R. Hasan, Z. Sun, J. Killough, Modeling wellbore heat exchangers: Fully numerical to fully analytical solutions, Renewable energy, 133 (2019) 1124-1135.
[30] M. Daneshipour, R. Rafee, Nanofluids as the circuit fluids of the geothermal borehole heat exchangers, International Communications in Heat and Mass Transfer, 81 (2017) 34-41.
[31] S. Iry, R. Rafee, Transient numerical simulation of the coaxial borehole heat exchanger with the different diameters ratio, Geothermics, 77 (2019) 158-165.
[32] D. Quaggiotto, A. Zarrella, G. Emmi, M. De Carli, L. Pockelé, J. Vercruysse, M. Psyk, D. Righini, A. Galgaro, D. Mendrinos, Simulation-based comparison between the thermal behavior of coaxial and double U-tube borehole heat exchangers, Energies, 12(12) (2019) 2321.
[33] A. Zarrella, M. Scarpa, M.D. Carli, Short time-step performances of coaxial and double U-tube borehole heat exchangers: Modeling and measurements, HVAC&R Research, 17(6) (2011) 959-976.
[34] C.J. Wood, H. Liu, S.B. Riffat, Comparative performance of ‘U-tube’and ‘coaxial’loop designs for use with a ground source heat pump, Applied Thermal Engineering, 37 (2012) 190-195.
[35] D. Mottaghy, L. Dijkshoorn, Implementing an effective finite difference formulation for borehole heat exchangers into a heat and mass transport code, Renewable energy, 45 (2012) 59-71.
[36] X. Song, Y. Shi, G. Li, Z. Shen, X. Hu, Z. Lyu, R. Zheng, G. Wang, Numerical analysis of the heat production performance of a closed loop geothermal system, Renewable Energy, 120 (2018) 365-378.
[37] X. Song, G. Wang, Y. Shi, R. Li, Z. Xu, R. Zheng, Y. Wang, J. Li, Numerical analysis of heat extraction performance of a deep coaxial borehole heat exchanger geothermal system, Energy, 164 (2018) 1298-1310.
[38] A.D. Chiasson, Geothermal heat pump and heat engine systems: Theory and practice, John Wiley & Sons, 2016.
[39] DIN, Polyethylene (PE)-Pipes PE 63, PE 80, PE 100, PE-HD–Dimensions,  (1999).
[40] E.D. Kerme, A.S. Fung, Heat transfer simulation, analysis and performance study of single U-tube borehole heat exchanger, Renewable Energy, 145 (2020) 1430-1448.
[41] I.I. Stylianou, S. Tassou, P. Christodoulides, L. Aresti, G. Florides, Modeling of vertical ground heat exchangers in the presence of groundwater flow and underground temperature gradient, Energy and Buildings, 192 (2019) 15-30.
[42] L. Lamarche, S. Kajl, B. Beauchamp, A review of methods to evaluate borehole thermal resistances in geothermal heat-pump systems, Geothermics, 39(2) (2010) 187-200.
[43] K. Bär, W. Rühaak, B. Welsch, D. Schulte, S. Homuth, I. Sass, Seasonal high temperature heat storage with medium deep borehole heat exchangers, Energy Procedia, 76 (2015) 351-360.
Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 7
October 2021
Pages 4361-4378

Files

Share

How to cite

Statistics