Energetic, Exergetic and Entropy Evaluation in the Solar Distillation

This work shows the evaluation of energy, exergy and entropy for the process of solar distillation of river water. The solar still is of the slope with fins and is tested for 3 initial volumes: 2, 4 and 6 L, for which data of temperature and solar radiation are recorded. Subsequently, the Dunkle's thermal model is applied and the energy, exergy and entropy balance are established to determine the efficiencies. The results show that the maximum energy efficiency in the solar still for 2, 4 and 6 L is 45%, 36% and 30% respectively, in exergy efficiency its maximum values are 4.7%, 3.8% and 2.9% for 2, 4 and 6 L of river water and finally the analysis of the entropy change, reached the maximum value of 1 kJ/Kg K in the 3 experimental tests.