Sun is a free source of energy that we use it to generate electricity with photovoltaics but that's not all the story about it. Solar thermal energy is another form of energy in solar beams emitted by the sun to the earth as a reason for the vaporization of seawater. Also, solar thermal energy causes the flows of air - winds and flows in oceans all around the globe. It changes the seasons of the year.  Additionally, solar thermal energy is a source of heat in passive or direct forms like preheating or warming water or air by solar collectors to run a power plant, provide domestic hot water or using solar radiation coming through windows directly into space. Now it is possible to use this clean and free energy in our homes and for portable use by application of new packaged collector technologies. So our team designed a solar thermal system in details on the roof of the building. This is a simple design of a solar thermal system.

As the world is going through growing in all aspects to better live by developing new technologies and a new standard of living, the people in a country will increase their use of energy to use that technology and that technology makes it easy to solve our problems until we get in trouble by facing with global warming and climate change or random events caused by nature.  Then, by the way, the source of energy we use is important.  We know that Renewables are the best solution as a reliable and free source of energy; photovoltaic systems produce electricity.  We designed a photovoltaic system and video shows the simulation and layout of that system in the project. Study of shading impact during a day (from 7 am to 4 pm) is the main target of this simulation.