A device that is used to collect heat by absorbing sunlight is known as a solar thermal collector. Electromagnetic radiation from infrared to ultraviolet wavelengths forms the energy of solar radiation. A solar collector mostly refers to hot solar panels, solar towers and solar air heaters. Simple solar arrays are used in residential and commercial buildings for heating space. Quantity of solar energy averages about 1,000 watts per square meter depending on weather conditions, location and orientation.
Solar collectors are of two types: concentrating and non-concentrating. The former has a bigger interceptor than absorber and the latter’s area is same as the absorber and thus the whole panel absorbs light. Evacuated tube and flat plate solar collector arrays are used to collect heat for heating space, domestic water heating or cooling with absorption chiller. This set up works best in deserts with clear sky and little cloud.