International Journal of Energy Engineering          
International Journal of Energy Engineering(IJEE)
Frequency: Quarterly
Editor-in-Chief: Prof. Sri Bandyopadhyay(Australia)
Efficient Type of Steam Condenser for Water Desalination of Solar Thermal Energy in Remote Arid Areas and Islands
Full Paper(PDF, 122KB)
Comparison of material usage and cost of two types of cross-flow steam condensers is reported in this study which can be used for water desalination in conjunction with a parabolic trough solar energy concentrator plant. Traditional shell and tube condensers (where steam flows inside the tubes) and surface condensers (where steam flows in the shell and cooling water flows in the tubes) are considered in this study. It has been found that the energy production from the PTC of dimensions 4.5 m × 4.8 m with an aperture area of 21.6 m2 was 19.4 kW. It has been calculated that the distilled water production capacity of the solar energy harnessing system per day is 55.6 l, assuming solar irradiance to be 0.9 kW m-2 and the efficiency of solar energy harnessing system as 50% if the sun is available for four hours. The cooling water input temperature was assumed to be 30 °C. The minimum length required for a SS 304 tube of Ø 9.5 mm was 7.16 m for the traditional condenser and 1.30 m for the surface condenser. The efficiency of the traditional condenser reduced due to the formation of a condensed water layer on the surface of the tube, as it acts as a thermal barrier. However, in the surface condenser, efficiency was enhanced due to easy condensation while increasing the system pressure. Further, efficiency is enhanced due to density separation of wet vapour by changing the flow direction near the wet sump. Fabrication cost and maintenance cost are also found to be less in the surface condenser. As such, it can be concluded that use of surface condenser is the most cost effective method, which uses a smaller amount of material making the condenser smaller and lighter.
Keywords:Heat exchanger; Parabolic trough concentrator; Steam condenser; Steam condensing methods; Surface condensation; Water desalination
Author: P. D. C. Kumara1, S. K. K. Suraweera1, H. H. E. Jayaweera1, A.M. Muzathik2, T. R. Ariyaratne1
1.Centre for Instrument Development, Department of Physics, University of Colombo, Colombo 03, Sri Lanka
2.Department of Mechanical Engineering, Faculty of Engineering, South Eastern University of Sri Lanka, Oluvil, Sri Lanka
  1. R. Deng, L. Xie, H. Lin, J. Liu and W. Han, “Integration of thermal energy and seawater desalination”, Energy, Vol. 35(11), pp. 4368–4374, Nov. 2010.
  2. X. Lixin, L. Pingli and W. Shichang, “A review of Seawater desalination and comparison of desalting Processes”, Chemical Industry and Engineering Progress, pp. 1081–1084, Oct. 2003.
  3. G. congjie and C. Guohua, “Seawater desalination technology and engineering hand book”, China Chemical Industry, 2004, p. 413.
  4. D. Hoffman, “The application of solar energy for large-scale seawater desalination”, Desalination, 89, pp. 115–184, 1992.
  5. S. Cesare, Survey of energy resources 2001 — solar energy, World Energy Council, London, UK, 2001.
  6. M. Naim, A. Mervat and A. El-Kawi, “Non-conventional solar stills. Part 1:Non-conventional solar stills with charcoal particles as absorber medium”, Desalination, 153, pp. 55–64, 2003.
  7. M. Z. Ibrahim, R. Zailan, M. Ismail and A. M. Muzathik, “Pre-feasibility study of hybrid hydrogen based energy systems for coastal residential applications”, Energy Research Journal, Vol. 1(1), pp. 12-21, 2010.
  8. A. M. Muzathik, W. M. N. W. Nik, K. Samo and M. Z. Ibrahim, “Hourly Global Solar Radiation Estimates on a Horizontal Plane”, Journal of Physical Science, Vol. 21 (2), 51-66, 2010.
  9. K. C. Kong, M. B. Mamat, M. Z. Ibrahim and A. M. Muzathik, “New approach on mathematical modelling of photovoltaic solar panel”, Applied Mathematical Sciences, Vol. 6 (8), pp. 381-401, 2012.
  10. A. M. Muzathik, M. Z. Ibrahim, K. B. Samo and B. W. W. Nik, “Assessment and Characterization of Renewable Energy Resources A Case Study in Terengganu-Malaysia”, Journal of Sustainability Science and Management, Vol. 7(2), pp. 220-229, 2012.
  11. B. V. D. Bruggen and V. D. C. Carlo, “Distillation vs. membrane filtration: overview of process evolutions in seawater desalination”, Desalination, 143, pp. 207–218, 2002.
  12. F. B. H. M. Qibl, “Solar thermal desalination technologies”, Desalination, pp. 633-644, 2008.
  13. S. Kalogiro, “Use of parabolic trough solar energy collectors”, Applied Energy, 60, pp. 65-88, 1998.
  14. L. Xu, S. Wang, S. Wang and Y. Wang, “Studies on heat-transfer film coefficients inside a horizontal tube in falling film evaporators”, Desalination, 166, pp. 215-222, 2004.
  15. F. Incropera, D. Dewitt, T. L. Bergman and A. Lavine, Fundamentals of Heat and Mass Transfer, 6th ed., John Wiley & Sons, United States of America, 2007.
  17. T. Eastop and A. McConkey, Applied Thermodynamics for Engineering Technologists, 5th ed., India: Pearson Education in South Asia, 1993.
  19. A. Yunus, Heat Transfer: A Practical Approach, 2nd ed., India: Tata McGraw-Hill Publishing Company Limited, 2003.