Introduction The sun is the source of all life on earth. Thanks to the sun, there is light, warmth and food on the earth. Many kinds of energy on earth originate from and through solar radiation. Since the sun doesn't have the same strength at all places and all times, the earth is warmed up unequally. This causes wind which can be converted into electricity by means of wind turbines. By evaporation we get precipitation …showed first 75 words of 1979 total…

…showed last 75 words of 1979 total…centigrade. The main difference between flat- and vacuum tube collectors is the warmth damming and the colloq costs (vacuum tube collectors are more expensive). Recommended is also the heating up of swimming pools through solarthermie. A accumulator is not necessary because the water in the swimming pool takes care this function. It is being pumped directly out of the pool and is brought into the collector circle where it is heated up and flows back.