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High potential regions for using clean and wide solar energy are suitable choices to apply solar distillation systems. Iran has large area with exposed solar radiation and also vast salty water sources at south and north, hence has an appropriate situation to use solar stills and solar distillation equipment. Researchers have focused on development and improvement of working solar distillation champers in recent years to get benefit from this modern technology in water crisis conditions. In this research, effect of storage of further heat and also using PCM were surveyed when flow turbulators were applied in the spiral heat exchanger and the salty water flow rates were changing simultaneously and it is the novelty of this research.. These experiments were carried out in mild and wet region in north of Iran, Babol city. These tests also were done during a year. The experiment results determined that during cold months (December to April) using PCM has no effect on efficiency of system. But in warm months (May to November) the effect of PCM is more than effect of stored heated water. The results show that using heat storage and also applying PCM increase the distilled water gain of system up to 7% and 14% respectively. Furthermore using turbulators can improve system’s water gain by increasing the heat transfer up to 14%. Maximum distilled water gain was equaled to 2250 milliliter/day.

Keywords: PCM, Solar distillation, PCM, Heat Transfer, Flow turbulators, Heat storage

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