Paper Title
Water Heating and Steam Production by the Parabolic Trough Collector PTC in the Ouargla Region

Abstract
The energy that the earth receives from the sun in one day is estimated to suffice the needs of the whole world for twenty years, so many countries are interested in studying it, especially those that receive high levels of solar radiation, including Algeria. In addition to the fact that this energy is from renewable energies, is inexpensive, environmentally friendly, has a lower cost, and is cheap. Where it can be used either by converting radiation directly into electricity through the absorption of optical photons by photoelectric cells, or by converting it into heat for heating through many applications, including Collectors. As the heat produced by the Collector radiation is absorbed on the absorption surface, then it is transferred to the used fluid to obtain high temperatures. There are two methods of focusing radiation: One is point and the other is linear, in the latter the focus is linear by means of a reflector on the surface of an absorbent tube fixed in the focal length. Our study targeted one of the many types of linear collectors, the Parabolic Trough Collector PTC. Where we track the effect of changing the length and width of the collector on the exit temperature of hot water used for industrial and domestic purposes, or the production of hot and pressurized steam to generate electricity. This is based on the modeling of physical phenomena with mathematical equations based on the energy balance and the optical behavior of the various parts of the Collector, in the city of Ouargla during the winter season. Among the results obtained, we notice an increase in the water exit temperature with an increase in the dimensions of the collector, where the water temperature exceeds 135 °C for a collector of 10 m length and 3.5 m width, and the steam is produced during a period of 4 hours and 35 minutes of the day, on March 21. Keywords - Hot Water, Solar Collectors, Solar Radiation, Steam