Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System
International Journal of Sustainable and Green Energy
Volume 8, Issue 3, September 2019, Pages: 56-64
Received: Jul. 8, 2019;
Accepted: Aug. 6, 2019;
Published: Aug. 19, 2019
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Teguh Hady Ariwibowo, Graduate School of Science and Engineering, Saga University, Saga, Japan; Department of Power Plant Technology, Politeknik Elektronika Negeri Surabaya (PENS), Surabaya, Indonesia
Akio Miyara, Department of Mechanical Engineering, Saga University, Saga, Japan; International Institute of Carbon-Neutral Energy Research, Kyushu University, Fukuoka-shi, Japan
Keishi Kariya, Department of Mechanical Engineering, Saga University, Saga, Japan
This article presents an investigation of a low curvature coiled tube with double discrete inclined ribs for an application to ground heat exchanger used in ground heat pump systems. Computational fluid dynamics is employed to analyze the heat transfer and fluid flow with several ribs. The analysis performs detailed study involving flow behavior, pressure drop, heat transfer rate, wall heat flux, absolute vorticity flux for a range of ribs height (0.45 mm, 0.75 mm, and 1 mm) and flowrate (ranging from 6 L/min to 10 L/min) on curvature of coil 2.22 m-1. COP improvement factor, which is a function of heat transfer enhancement and pressure loss increase, is evaluated. The increasing of ribs height can deviate secondary flow, which contributes to heat transfer and pressure drop enhancement. In the case of higher ribs, circumferential heat flux distribution tends to be more fluctuated. The heat flux distribution also becomes smaller with the increasing of axial distance. The COP improvement factor significantly improves with the increase of ribs height. On the other hand, the COP Improvement factor tends to decrease with the increase in flow rate. The application of ribs in a low curvature coil is attractive and has the potential for Slinky-coil ground heat exchangers.
Teguh Hady Ariwibowo,
Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System, International Journal of Sustainable and Green Energy.
Vol. 8, No. 3,
2019, pp. 56-64.
D. Adamovsky, P. Neuberger, R. Adamovsky, “Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps”. Energy and Buildings, 2015, Vol. 92, pp. 107-115.
S, Yoon, S. R. Lee, H. G. Go, “Numerical modeling of slinky-coil horizontal ground heat exchangers. Energy and Buildings”, 2015, Vol. 105, pp. 100-105.
P. M. Congedo, G. Colangelo, G. Starace, “CFD simulations of horizontal ground heat exchangers: a comparison among different configurations”. Applied Thermal Engineering, 2012, vol. 33-34, pp. 24-32.
Y. Wu, G. Gan, A. Verhoef, P. L. Vidale, R. G. Gonzalez, “Experimental measurement and numerical simulation of horizontal-coupled slinky ground source heat exchangers”, Applied Thermal Engineering, 2010, vol. 30, pp. 2574-2583.
H. Fujii, K. Nishi, Y. Komaniwa, N. Chou, “Numerical modeling of slinky-coil horizontal ground heat exchangers”. Geothermics, 2012, vol. 41, pp. 55-62.
Y. Chong, G. Gan, A. Verhoef, R. G. Garcia, “Comparing the thermal performance of horizontal slinky-loop and vertical slinky-loop heat exchangers”. International Journal of Carbon Technology, 2013, vol. 9, pp. 250–255.
M. H. Ali, K. Kariya, A. Miyara, “Performance Analysis of Slinky Horizontal Ground Heat Exchangers for a Ground Source Heat Pump System”. Resources, 2017, vol. 6, pp. 1-18.
Wanda, S.; Miyara, A.; Kariya, K. Analysis of Short Time Period of Operation of Horizontal Ground Heat Exchangers. Resources. 2015, 4, 507-523.
B. K. Hardik, P. K. Baburajan, S. V. Prabhu, “Local heat transfer coefficient in helical coils with single phase flow”. International Journal of Heat and Mass Transfer, 2015, vol. 89, pp. 522-538.
W. R. Dean, “Note on the motion of fluid in a curved pipe”. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 1927, vol. 4, pp. 208-223.
W. R. Dean, “The stream-line motion of fluid in a curved pipe”, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 1928, vol. 5, pp. 673-695.
S. Agrawal, G. Jayaraman, V. K. Srivastava, K. D. P. Nigam, “Power law fluids in a circular curved tube. Part I. Laminar flow”. Polymer-Plastics Technology and Engineering, 1993, vol. 32, pp. 595-614.
L. R. Austin, J. D. Seader, “Entry region for steady viscous flow in coiled circular pipes”. American Institute of Chemical Engineers Journal, 1974, vol. 20, pp. 820-822.
H. Saffari, R. Moosavi, M. N. Nouri, C. X. Lin, “Prediction of hydrodynamic entrance length for single and two-phase flow in helical coils”. Chemical Engineering and Processing: Process Intensification, 2014, vol. 86, pp 9-21.
S. C. R. Dennis, M. Ng, “Dual solutions for steady laminar flow through a curved tube”. The Quarterly Journal of Mechanics and Applied Mathematics, 2010, vol. 30, pp. 305-324.
S. Agrawal, K. D. P. Nigam, “Modelling of a coiled tubular chemical reactor”. Chemical Engineering Journal, 2001, vol. 84, pp. 437-444.
D. G. Prabhanjan, T. J. Rennie, G. S. V. Raghavan, “Natural convection heat transfer from helical coiled tubes”. International Journal of Thermal Sciences, 2004, vol. 43, pp. 359-365.
M. R. Salimpour, “Heat transfer coefficients of shell and coiled tube heat exchangers”, Experimental Thermal and Fluid Science. 2009, vol. 33, pp. 203-207.
N. Jamshidi, M. Farhadi, D. D. Ganji, K. Sedighi, “Experimental analysis of heat transfer enhancement in shell and helical tube heat exchangers”. Applied Thermal Engineering, 2013, vol. 51, pp. 644-652.
L. Wang, B. Sunden, “An experimental investigation of heat transfer and fluid flow in a rectangular duct with broken V-shaped ribs”, Experimental Heat Transfer. 2004, vol. 17, pp. 243-259.
J. A Meng, X. G. Liang, Z. X. Li, “Field synergy optimization and enhanced heat transfer by multi-longitudinal vortexes flow in tube”. International Journal of Heat and Mass Transfer, 2005, vol. 48, pp. 3331-3337.
X. W. Li, H. Yan, J. A. Meng, Z. X. Li, “Visualization of longitudinal vortex flow in an enhanced heat transfer tube”. Experimental Thermal and Fluid Science, 2007, vol. 31, pp. 601-608.
X. Y. Tang, D. S. Zhu, “Flow structure and heat transfer in a narrow rectangular channel with different discrete rib arrays”. Chemical Engineering and Processing: Process Intensification, 2013, vol. 69, pp. 1-14.
P. S. Kathait, A. K. Patil, “Thermo-hydraulic performance of a heat exchanger tube with discrete corrugations”, Applied Thermal Engineering, 2014, vol. 66, pp. 162-170.
N. Zheng, W. Liu, Z. Liu, P. Liu, F. A. Shan, “A numerical study on heat transfer enhancement and the flow structure in a heat exchanger tube with discrete double inclined ribs”. Applied Thermal Engineering, 2015, vol. 90, pp. 232-241.
ANSYS® Academic Research, Release 17.2, Help System, Fluent Theory Guide, ANSYS, Inc.
Jalaluddin, A. Miyara, “Thermal performance and pressure drop of spiral-tube ground heat exchangers for ground-source heat pump”. Applied Thermal Engineering, 2015, vol 9, pp. 630-637.
R. C. Xin, M. A. Ebadian, “The effects of Prandtl numbers on local and average convective heat transfer characteristics in helical pipes”, Journal of Heat Transfer, 1997, vol. 119, pp. 467-473.
Z. M. Lin, L. D. Sun, L. B. Wang, “The relationship between absolute vorticity flux along the main flow and convection heat transfer in a tube inserting a twisted tape”, Heat Mass Transfer, 2009, vol. 45, pp. 1351-1363.
L. Tang, S. Yuan, M. Malin, S. Parameswaran, “Secondary vortex-based analysis of flow characteristics and pressure drop in helically coiled pipe”, Advances in Mechanical Engineering, 2017, vol 9 (4), pp. 1-11.