Performance a double slope of the solar still Integrated With or without parabolic trough collector is investigated experimentally. To improve the output of a double slope solar still, a number of initiatives have been undertaken, using wax as a phase change material (PCM) with a parabolic trough collector. A parabolic trough collector (PTC) transfers incident solar energy to the solar still through a water tube connected to a heat exchanger embedded in used microcrystalline wax. Experiments were carried out after orienting the basin to the south and holding the water depth in the basin at 20 mm. According to the results obtained, the solar stills with parabolic trough collector have higher temperatures and productivity than solar stills without parabolic trough collector, as well as the ability to store latent heat energy in solar still, allowing fresh water to condense even after sunset. In addition, the parabolic trough collector with phase change material in the double slope solar improves productivity by 37.3 % and 42 %, respectively.

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This study is concerned with modeling and simulating clean sun energy and using it to heat water for the family using a program that depends on a set of basic parts, including (the storage tank, Flat plate collector). Where this study included temperatures ranging from 20 - 50 degrees Celsius and was found through the results, We note that the maximum temperature can reach 56 degrees Celsius between the sixth and seventh months and that the amount of heat losses reaches approximately 72KW in the seventh month and the amount of energy reaches 12KW / h.

Through this study, thermal conductivity of polymer hybrid composites filled with natural particles will be studied experimentally. In this study, A modified hot wire method is used to measure the thermal conductivity of the composites consisting of polyester matrix filled with neutral particles of date and olive up to 15% by weight ratio. With the increase in the density of natural materials, date kernel powder and olive powder additives to polyester to form the compounds filled with it, there is an irregular increase in the thermal conductivity. With increasing the temperature, thermal conductivity decreases to give good insulated composite material.