| abstract |
Systems including devices for collecting radiation, such as from the sun, without tracking, are disclosed. The devices are able to collect radiation incident from different directions. In one version, the devices have a three-dimensional collecting surface that directs light to an inner radiation receiver. The collecting surface may collect radiation coming from directions above a local or visible horizon, such as from the sky, or from substantially any direction. The collecting surface may have a frame supporting faces for concentrating light onto a radiation receiver. A reflecting dish or concave element may be provided below the radiation receiver for reflecting radiation to the radiation receiver. The radiation receiver may generate electricity from the collected radiation, directly through photovoltaic means or indirectly by heating a fluid that is directed to a turbine-generator. The radiation receiver may be used to heat a fluid for another purpose, such as providing hot water or desalination. |