Solar desalination is a suitable and cost-effective system for producing fresh water from salt water. The main goal of this study is improving the thermal performance of a solar desalination with latent thermal storage system and the spraying unit. The heat loss of the solar collector increases due to the fluctuations in the intensity of solar radiation. Using phase change materials is a suitable solution for storing energy during peak hours and releasing it when the solar radiation intensity is reduced or in cloudy times. Moreover, due to the effective area of the spraying mechanism the desalination efficiency enhanced. Thermal performance of the collector was analyzed at three spraying rates of 0.25, 0.5 and 1l/min with and without phase change material in consecutive days from 10:00 to 14:00. The results showed that the presented solar desalination system equipped with paraffin (as PCM) wax had the highest thermal efficiency at the spraying rate of 1l/min and the lowest with a flow rate of 0.25l/min. With integration PCM and spraying mechanism the amount of produced fresh water during 4 hours was 1840 ml/m2 and it significantly reduced the hardness of the produced water. The solar collector simulated by Anysy and the simulated results showed a good correlation between the predicted and experimental data with reasonable accuracy (R2>0.97).
