Cover
Vol. 22 No. 1 (2022)

Published: April 30, 2022

Pages: 29-35

Original Article

Theoretical and Experimental Study of Water Storage Tank with Earth Water Heat Exchanger in Hot Climates Regions

Amer Abduladheem Dakhil 1 Salman Hashim Hammadi 1
1 Department of Mechanical Engineering, College of Engineering, University of Basrah, Basrah, Iraq
History
  • Received: September 4, 2021
  • Revised: October 6, 2021
  • Accepted: October 12, 2021
  • Available Online: April 24, 2022
DOI

https://doi.org/10.33971/bjes.22.1.4

Abstract

Concerning commercial and residential buildings, one of the major parts related to water supply systems is the water storage tanks. For gravity- fed buildings, the tanks must be installed on the roof. In Iraqi summer, the temperature of water in storage tanks reaches above 50 °C due to high solar intensity, which makes it inappropriate for domestic usage. One of the proposed solutions to overcome this problem is feeding the hot water into an earth-water heat exchanger (EWHE) which consists of a set of buried pipes installed underground level to reduce its temperature. The storage tank and the earth-water heat exchanger were studied experimentally and theoretically by using ANSYS 20/FLUENT software to estimating the water temperature in the storage tank and the temperature of the water leaving the EWHE. The most important results obtained theoretically and experimentally that when using pipe length, pipe diameter, and mass flow rate of 100 m, 0.016 m, 0.7 LPM respectively, at a depth of 3 m, the water temperature decreases by about 15 °C. Also, the results have shown a good agreement between the experimental and theoretical works. One can conclude that an earth-water heat exchanger is an effective way to decrease the temperature of the storage water to an acceptable level for domestic usages.

Keywords

References

  1. S. H. Hammadi, “Tempering of water storage tank temperature in hot climates regions using earth water heat exchanger”, Thermal Science and Engineering Progress, Vol. 6, pp. 157-163, 2018.
  2. S. Jakhar, M. S. Soni, and N. Gakkhar, “Modelling and simulation of concentrating photovoltaic system with earth water heat exchanger cooling”, Energy Procedia, Vol. 109, pp. 78-85, 2017.
  3. C. T. Joen, L. Liu and M. De Paepe, “Comparison of EarthAir and Earth-water Ground Tube Heat Exchanger for Residential Application”, International Refrigeration and Air Conditioning Conference, No. 2194, pp. 1-10, 2012. https://docs.lib.purdue.edu/iracc/1209/
  4. M. O. Hamdan, “Tapping to geothermal energy through a high-performance earth-to-water heat exchanger design”, IEEE, In 2018 5th International Conference on Renewable Energy: Generation and Applications (ICREGA), pp. 207210, 2018.
  5. N. Naili, M. Hazami, I. Attar, and A. Farhat, “In-field performance analysis of ground source cooling system with horizontal ground heat exchanger in Tunisia”, Energy, Vol. 61, pp. 319-331, 2013.
  6. S. Jakhar, and M. S. Soni, “Experimental and theoretical analysis of glazed tube-and-sheet photovoltaic/thermal system with earth water heat exchanger cooling”, Energy Conversion and Management, Vol. 153, pp 576-588, 2017.
  7. J. B. A. Lima, R. T. A. Prado, V. M. Taborianski, “Optimization of tank and flat-plate collector of solar water heating system for single-family households to assure economic efficiency through the TRNSYS program”, Renewable Energy, Vol. 31, Issue 10, pp. 1581-1595, 2006. https://doi.org/10.1016/j.renene.2005.09.006
  8. Y. M. Han, R. Z. Wang, and Y. J. Dai, “Thermal stratification within the water tank”, Renewable and Sustainable Energy Reviews, Vol. 13, Issue 5, pp. 10141026, 2009. https://doi.org/10.1016/j.rser.2008.03.001
  9. H. K. Versteeg, and W. Malalasekera, An Introduction to Computational Fluid Dynamics, the Finite Volume Method, Second edition, Pearson Education Limited, 2007. ISBN: 978-0-13-127498-3
  10. Y. El Mghouchi, A. El Bouardi, Z. Choulli and T. Ajzoul, “Models for obtaining the daily direct, diffuse and global solar radiations”, Renewable and Sustainable Energy Reviews, Vol. 56, pp. 87-99, 2016.
  11. B. Jamil, A. T. Siddiqui and N. Akhtar, “Estimation of solar radiation and optimum tilt angles for south-facing surfaces in Humid Subtropical Climatic Region of India”, Engineering Science and Technology, an International Journal, Vol. 19, Issue 4, pp. 1826-1835, 2016.
  12. M. A. Saleh, S. Kaseb, and M. F. EL-Refaie, “Glassazimuth modification to reform direct solar heat gain”, Building and Environment, Vol. 39, Issue 6, pp. 653-659, 2004. https://doi.org/10.1016/j.buildenv.2003.08.009