PARAMETRIC ANALYSIS OF A SOLAR STILL WITH INVERTED V-SHAPED GLASS CONDENSER

Abstract

A parametric analysis of a solar still with an inverted V-shaped glass condenser is presented. Results are based on a new mathematical model obtained from a lumped-parameter analysis of the still, with an approach that makes each glass plate of the condensing system sensitive to orientation and depicts its thermal differences. Numerical computations are made to evaluate productivity and temperature differences between the condensing plates as a function of condenser orientation, extinction coefficient and thickness. From this study it was found a significant influence of incident solar radiation on the thermal performance of each condensing plate. Large extinction coefficients and thick glass plates increase absorption losses that result in an appreciable temperature difference. An extinction coefficient of 40 m-1 produces a temperature difference of 2.5°C between both condensers. A glass thickness of 10 mm may increase this temperature difference up to 3.5°C. With respect to the production, due to the still orientation, a difference of 8.7% was found for the condensing plates facing an east-west direction. The proposed model is able to reproduce the temperature and distillate production differences that arise between both condensers in good agreement with experimental data. The overall performance of the still, studied with this new approach, was also in accordance with the widely used traditional models for solar distillation. In addition, the condensing plates parameters of the still can be used to force a differential heating such that for the whole day the temperature of one condensing plate is always higher.

Keywords

Dates

  • Submission Date2012-10-29
  • Revision Date2014-05-21
  • Acceptance Date2014-05-25
  • Online Date2014-06-21

DOI Reference

10.2298/TSCI121029067R

References

  1. Cooper, P.I., Read, W.R.W., Design philosophy and operating experience for Australian solar stills, Solar Energy, 16 (1974), pp. 1-8
  2. Garg, H.P., Mann, H.S., Effect of climatic, operational and design parameters on the year round performance of single-sloped and double-sloped solar still under Indian arid zone conditions, Solar Energy, 18 (1976), pp. 159-163
  3. Toure, S., Meukam, P., A numerical model and experimental investigation for a solar still in climatic conditions in Abidjan (Cote D´Ivoire), Renewable Energy, 11 (1997), pp. 319-330
  4. Nafey, A.S., Abdelkader, M., Abdelmotalip, A., Mabrouk, A.A., Parameters affecting solar still productivity, Energy Conversion and Management, 41(2000), pp. 1797-1809
  5. Phadatare, M.K., Verma, S.K., Influence of water depth on internal heat and mass transfer in a plastic solar still, Desalination, 217 (2007), pp. 267-275
  6. Cooper, P.I., Digital simulation of transient solar still processes, Solar Energy, 12 (1969), pp. 313-331
  7. Badran, O.O., Experimental study of the enhancement parameters on a single slope solar still productivity, Desalination, 209 (2007), pp. 136-143
  8. Tarawneh, M.S., Effect of water depth on the performance evaluation of solar still, Jordan Journal of Mechanical and Industrial Engineering, 1 (2007), pp. 23-29
  9. El-Sebaii, A.A., Effect of wind speed on some designs of solar stills, Energy Conversion and Management, 41 (2000), pp. 523-538
  10. Khalifa, A.J., Hamood, A.M., On the verification of the effect of water depth on the performance of basin type solar stills, Solar Energy, 83 (2009), pp. 1312-1321
  11. El-Sebaii, A.A., Effect of wind speed on active and passive solar stills, Energy Conversion and Management, 45 (2004), pp. 1187-1204
  12. Cooper, P.I., The absorption of radiation in solar stills, Solar Energy, 12 (1969), pp. 333-346
  13. Singh, A.K., Tiwari, G.N., Sharma, P.B., Khan, E., Optimization of orientation for higher yield of solar still for a given location, Energy Conversion and Management, 36 (1995), pp. 175-181
  14. Fernández, J.L., Chargoy, N., Multi-stage, indirectly heated solar still, Solar Energy, 44 (1990), pp. 215-223
  15. Duffie, J., Beckman, W., Solar Engineering of Thermal Processes, John Wiley and Sons Inc., New York, USA, 1991
  16. Watmuff, J.H., Charters, W.W.S., Proctor, D., Solar and wind induced external coefficients solar collectors, Revue Internationale Heliotechnique, 2 (1977), p. 56
  17. Sharma, V.B., Mullick, S.C., Estimation of heat-transfer coefficients, the upward heat flow, and evaporation in a solar still, ASME Journal of Solar Energy Engineering, 113 (1991), pp. 36-41
  18. Bejan, A., Convection Heat Transfer, John Wiley and Sons Inc., New York, USA, 1995
  19. Dunkle, R.V., Solar water distillation: the roof type still and a multiple effect diffusion still, International Developments in Heat Transfer, Int. Heat Transfer Conference, Part 5, University of Colorado, 1961, pp. 895-902
  20. Rubio-Cerda, E., Porta-Gándara, M.A., Fernández-Zayas, J.L., Thermal performance of the condensing covers in a triangular solar still, Renewable Energy, 27(2002), pp. 301-308
  21. Poulikakos, D., Bejan, A., The fluid dynamics of an attic space, Journal of Fluid Mechanics, 131 (1983), pp. 251-269
  22. Baum, V.A., Bairamov, R., Heat and mass transfer processes in solar stills of hotbox type, Solar Energy, 8 (1964), pp. 78-82