"nonconcentrating" - 1 õppematerjal

Energy - põhjalik referaat energiast

No mechanical equipment is needed for passive solar heating. Active heating systems require a collector to absorb and collect solar radiation. Fans or pumps are used to circulate the heated air or heat absorbing fluid. Active systems often include some type of energy storage system. 29  Picture 8.1. Solar cells Solar collectors can be either nonconcentrating or concentrating. 1) Nonconcentrating collectors ­ have a collector area (i.e. the area that intercepts the solar radiation) that is the same as the absorber area (i.e., the area absorbing the radiation). Flat- plate collectors are the most common and are used when temperatures below about 200o degrees F are sufficient, such as for space heating. 2) Concentrating collectors ­ where the area intercepting the solar radiation is greater, sometimes hundreds of times greater, than the absorber area. 8.3 Solar thermal power plants