In this paper external solar collector and double slope solar still having a phase change materials are connected and experiment was carried out. The output of a solar still connected to external solar collector and the PCM is analyzed with experimental setup. The solar energy falls on the external heat collected is sent to the solar still through the heat exchanger. To continue the evaporation process during night time the Phase changing materials are used to store solar thermal energy collected by the system at daytime as latent heat. The direct solar radiation used to heat the phase changing material, basin saline water and external heat collector. The external parabolic heat pipe having a 5000ml ethylene glycol heat transfer fluid a copper coil is immersed into the ethylene glycol.

The experimental analyzes and output of solar still with external heat collector and paraffin wax discussed. External heat collector receives energy from the sun and its send to the solar still through the combined actions of ethylene glycol oil and copper coil. The evaluation between the output of steel with an external heat collector and phase change material is performed. The result shows that the outcome of a solar still without external heat collector and paraffin wax material is lower than the output of steel with external heat collector and paraffin wax. The output of fresh water is increased by combining the still with external heat collector and phase change material. The daily drinking water outputs for different arrangement are noted. The output and percentage of potable water for solar still is 1252ml also 25.04%. The fresh water output and percentage of fresh water is 2122ml and 42.44% for still with paraffin wax. The fresh water output and percentage of fresh water is 2055ml and 17.86% for still with external heat collector. Fresh water output and percentage of fresh water is 3515ml and 28.57% for still with external heat collector and paraffin wax. The productivity of a solar still with an external heat collector and paraffin wax is higher than the solar still without parabolic trough collector and PCM.

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