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.