Exergy variations of the gradient layer in a shallow solar pond

Year 2015, Volume: 36 Issue: 3, 2412 - 2417, 13.05.2015

Rasool Jahromy

Abstract

Abstract. A salinity gradient solar pond can act as a solar thermal energy storage source for all seasons of the year and in all weather conditions. Solar pond layers exergy can be considered as the potential for getting the maximum amount of work done. Exergy in a gradient layer was studied based on the experimental data of the years 1997 and 1998 for 229 days in a solar pond in Ferdowsi university of Mashhad. The research revealed that variations of specific exergy (exergy per unit mass) for gradient layer, is affected by temperature variations of lower and upper convective layers. The specific exergy reached its maximum in mid-August, but the exergy per pond unit area in the early period of that month reached the maximum amount, because in addition to the temperature variations of the lower and upper convective layers, the time variations of the gradient layer thickness also affect exergy variations per unit area.

Keywords

Exergy, Gradient layer, Heat and mass transfer, solar pond

References

• Weinberger, H. ( 1964), “ The physics Of the solar pond”, solar Energy, 8 (2), pp. 45-56
• Meyer, K.A. (1983), “Numerical model for describing the layer behavior in salt-gradient solar pond”, Journal of Solar Energy Engineering, 105(4), pp. 341-34
• Jaefarzadeh, M.R. (2000), “On the performance of a salt gradient solar pond”, Applied Thermal Engineering 20(3), pp. 243–252
• Karakilcik, M. and Dincer, I. (2008), “Exergetic performance analysis of a solar pond” International Journal of Thermal Sciences 47(1), 93–102
• Dehghan, A.A., Movahedi, A. and Mazidi, M. (2013) “Experimental investigation of energy and exergy performance of square and circular solar ponds”, Solar Energy 97, pp. 273–284
• Bozkurt, I. and Karakilcik, M. (2015), “Exergy analysis of a solar pond integrated with solar collector ”, Solar Energy 112, pp. 282-289
• Hull, J.R. and Nielsen C.E., (1988) “Steady state analysis of the rising solar pond”, Solar Energy Technology, in: Murphy, Mancimi (Eds.), Proceedings of ASME, pp. 1508–1512