International Journal of Sustainable and Green Energy
Volume 6, Issue 5, September 2017, Pages: 64-75
Received: Jul. 29, 2017;
Accepted: Aug. 7, 2017;
Published: Aug. 23, 2017
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Md. Hasan Ali, Graduate School of Science and Engineering, Saga University, Saga, Japan; Department of Energy Science and Engineering, Khulna University of Engineering & Technology, Khulna, Bangladesh
Akio Miyara, Department of Mechanical Engineering, Saga University, Saga, Japan; International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka-shi, Japan
Keishi Kariya, Department of Mechanical Engineering, Saga University, Saga, Japan
In this paper, a two-dimensional axisymmetric numerical simulation model was developed for optimization of double (coaxial) tube vertical ground heat exchangers (GHEs) in cooling mode. Details of the heat transfer rates and pressure drops for each model are presented and analyzed. The results of the numerical study of optimization of double tube vertical GHEs have been done by considering heat transfer rates and pressure drops. The effect of different inlet and outlet tube diameters, and mass flow rates were numerically investigated. Effect of the different materials on heat transfer and longtime operation also discussed. The double tube vertical GHEs are more effective in laminar flow condition considering balance between heat transfer and pressure drop. The results indicate that since in laminar flow condition, pressure drop is not significantly high, it is possible to reduce the inlet and outlet diameter of double tube GHEs if double tube GHEs operate in laminar flow condition. The heat transfer rate decreased only 17% but diameter of the inlet tube can be reduced from 130 mm to 40 mm with fixed outlet diameter 20 mm. Heat transfer rate can also be enhanced by reducing the outlet tube diameter for a fixed inlet tube diameter. Long time operation suggested the possibility of installation of multiple double tube GHE at 2.0 m apart.
Md. Hasan Ali,
Numerical Optimization of Double Tube GHE for Ground Source Heat Pump, International Journal of Sustainable and Green Energy.
Vol. 6, No. 5,
2017, pp. 64-75.
J. E. Bose, M. D Smith, and J. D. Spitler, “Advances in ground source heat pump systems-An international overview,” Proceedings of the Seventh International Energy Agency Heat Pump Conference, 2002, Beijing, China, pp. 313-324.
I. Sarbu, and C. Sebarchievici, “General review of ground source heat pump systems for heating and cooling of buildings,” Energy and Buildings, 2014, vol. 70, pp. 441-454.
H. Esen, M. Inalli, “Thermal response of ground for different depths on vertical ground source heat pump system in Elazig, Turkey,” Journal of the Energy Institute, 2009, vol. 82 (2), pp. 95-101.
S. P. Kavanaugh, and K. Rafferty, “Ground-source heat pumps, design of geothermal systems for commercial and institutional buildings,” 1997, Atlanta: ASHRAE.
D. Banks, “An introduction to thermo geology: ground source heating and cooling,” 2008, Wiley-Blackwell.
H. Yang, P. Cui, and Z. Fang, “Vertical-borehole ground-coupled heat pumps: a review of models and systems,” Applied Energy, 2010, vol. 87 (1), pp. 16-27.
M. Khan, “Modeling, simulation and optimization of ground source heat pump systems,” M. S. Thesis, Oklahoma State University, 2004, USA.
V. Khalajzadeh, G. Heidarinejad, and J. Srebric, “Parameters optimization of a vertical ground heat exchanger based on response surface methodology” Energy and Buildings., 2011, vol. 43 (6), pp. 1288–1294.
S. Sanaye, and B. Niroomand, “Thermal-economic modeling and optimization of vertical ground-coupled heat pump,” Energy Conversion and Management, 2009, vol. 50 (4), pp. 1136-1147.
S. Huang, Z. Ma, and F. Wang, “A multi-objective design optimization strategy for vertical ground heat exchangers,” Energy and Buildings, 2015, vol. 87, pp. 233-242.
J. E. Bose, J. D. Parker, and F. C. McQuiston, “Design/Data manual for closed-loop ground coupled heat pump systems,” Atlanta, ASHRAE, 1985.
C. Zhang, S. Hu, Y. Liu, and Q. Wang, “Optimal design of borehole heat exchangers based on hourly load simulation,” Energy, 2016, vol. 116, pp. 1180-1190.
W. Zhang, H. Yang, L. Lu, and Z. Fang, “The heat transfer analysis and optimal design on borehole ground heat exchangers,” Energy Procedia, 2014, vol. 61, pp. 385 – 388.
X. Y. Li, T. Y. Li, D. Q. Qu, and J. W. Yu, “A new solution for thermal interference of vertical U-tube ground heat exchanger for cold area in China,” Geothermics, 2017, vol. 65, pp. 72-80.
G. Florides, E. Theofanous, I. Iosif-Stylianou, S. Tassou, P. Christodoulides, Z. Zomeni, E. Tsiolakis, S. Kalogirou, V. Messaritis, P. Pouloupatis, and G. Panayiotou, “Modeling and assessment of the efficiency of horizontal and vertical ground heat exchangers,” Energy, 2013, vol. 58, pp. 655–663.
Jalaluddin, and A. Miyara, “Thermal performance and pressure drop of spiral-tube ground heat exchangers for ground-source heat pump,” Applied Thermal Engineering, 2015, vol. 90, pp. 630-637.
Jalaluddin, A. Miyara, K. Tsubaki, S. Inoue, and K. Yoshida, “Experimental study of several types of ground heat exchanger using a steel pile foundation,” 2011, Renewable Energy, vol. 36, pp. 764-771.
Jalaluddin, and A. Miyara, Thermal performance investigation of several types of vertical ground heat exchangers with different operation mode, Applied Thermal Engineering, 2012, vol. 33-34, pp. 167-174.
JSME Data Book: Heat Transfer, fifth ed. The Japan Society of Mechanical Engineers, 2009, (in Japanese).
A. Bejan, and A. D. Kraus, “Heat transfer handbook,” John Wiley & Sons, Inc., New Jersey, 2003.
ANSYS® Academic Research, Release 17.2.
ANSYS® Academic Research, Release 17.2, Help System, Fluent Theory Guide, ANSYS, Inc.
ANSYS® Academic Research, Release 17.2, Help System, Fluent User’s Guide, ANSYS, Inc.
H. N. Pollack, S. J. Hurter, and J. R. Johnson, “Heat flow from the earth's interior: analysis of the global data set,” Rev. Geophys, 1993, vol. 31, pp. 267-280.