CYLINDRICAL PARABOLIC CONCENTRATOR : A cylindrical parabolic trough is a conventional optimal imaging device used as a solar concentrator. It consists of a cylindrical parabolic reflector and a receiver as its focal plane(fig).The receiver is backend at the outside surface and is covered by concentrator and rotated about one axis to track the sun's diurnal motion. The heat transfer fluid flows through the absorber tube, gets heated and thus carries heat. Such concentrators have been in use for many years. The aperture diameter, rim angle and absorber size and shape may be used to define the concentrator .The absorber tube may be used better performance .Depending on the temperature different heat transfer liquids may be used.
There are many types of technologies to do this, for example parabolic trough, compact linear Fresnel reflectors, Stirling solar dish and solar power tower. Floatovoltaics are simply photovoltaics that float on the surface of water, for example in canals, lakes, water reservoirs and ponds. This allows for the photovoltaics to collect energy while not taking valuable land, reducing water evaporation and working more efficiently because the photovoltaics are being cooled down by the
The first picture taken by an X-ray rocket-borne telescope was taken in 1963 and it was of the sun. This telescope was built two centuries after the reflector telescope. In the early 1970s the first ever orbiting X-ray telescope was created. The way X-ray telescopes work is that they collect the X-rays that are emitted by the stars, sun and super nova’s in space. This is done through the use of curved lenses and an electronic eye.
Role of solar shading Active solar design Active solar design uses the mechanical and electrical equipment to convert solar energy to heat and electric power. This design can generate much more heat than a passive one. For this design we need a solar collector to absorb solar energy.  Active solar collectors They are usually solar panels which consists of PV cells, (the device which convert light from the sun into electricity.) Active solar design must utilize the substance to act as a conductor .Hence, heat and electricity can be stored and transferred.
Steam engines are still used on daily bases today and many modern electricity generators are build up on the simple structure of a steam engine, for example coal and nuclear power plants still use the same principle. This also shows how it had a lasting effect on our modern day society and also on the way we still work with a steam engine
1 OVERVIEW OF SOLAR COLLECTOR : Solar energy collectors are special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar system is the solar collector. This is a device which absorbs the incoming solar radiation, converts it into heat, and transfers this heat to a fluid (usually air, water, or oil) flowing through the collector. The solar energy thus collected is carried from the circulating fluid either directly to the hot water or space conditioning equipment or to a thermal energy storage tank from which can be drawn for use at night and/or cloudy days. There are basically two types of solar collectors: nonconcentrating or stationary and concentrating.
Omotoyosi et al. (2017) described that due to energy and electricity crisis, solar cookers have achieved the attention. Some of solar cookers either exposed the cooking section either direct to the sun or indirectly exposing to sunshine. To overcome the solar cooker’s problems, parabolic reflectors has been used to heat the expected material in a frustum like receiver. The cooker having insulating energy storage separated from dish and cavity system.
The company has projects set up in France, Japan, and England and other parts of the world are also piloting projects including a project in India and California in the U.S. Space Based Solar: Scientists are resurrecting a technology that was first tested over forty years ago in which space-based satellites capture sunlight and convert it into microwave energy that is then beamed back to earth. This type of technology promises to capture significant more amount of sunlight (nearly ninety percent) since satellites can be positioned to optimize light capture round the clock. India, China and Japan are investing heavily in these technologies right
About 70% of sunlight gets reflected back into the space and we have only 30% of sunlight to meet up our energy demands. Solar energy has become quite practical to use and many applications have created for it. First of these is solar heaters. Whether it is industrial grade water heating or simple heating to cook food, solar energy can be utilized quite easily. With the development of solar panels and photovoltaic cells, it can also be used to create and store energy as needed.