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Today’s Solar Power Generating Technologies
Published in Anco S. Blazev, Solar Technologies for the 21st Century, 2021
The receiver, placed at the top of a tower, is located at a point where reflected energy from the heliostats can be intercepted most efficiently. The receiver absorbs the energy being reflected from the heliostat field and transfers it into a heat transfer fluid. Taking a closer look at the receivers, we see that there are two basic types of receivers, external and cavity receivers.External receivers normally consist of panels of many small (20-56 mm) vertical tubes welded side-by-side to approximate a cylinder. The bottoms and tops of the vertical tubes are connected to headers that supply heat transfer fluid to the bottom of each tube and collect the heated fluid from the top of the tubes. The tubes are usually made of Incoloy 800 and are coated on the exterior with high-absorption black paint.External receivers typically have a height-to-diameter ratio of 1:1 to 2:1. The area of the receiver is kept to a minimum to reduce heat loss. The lower limit is determined by the maximum operating temperature of the tubes and hence the heat removal capability of the heat transfer fluid.Cavity receivers are an attempt to reduce heat loss from the receiver by placing the flux absorbing surface inside an insulated cavity, thereby reducing the convective heat losses from the absorber. The flux from the heliostat field is reflected through an aperture onto absorbing surfaces forming the walls of the cavity. Typical designs have an aperture area of about one-third to one-half of the internal absorbing surface area.
Economic analysis of solar thermal system for melting of ice at high altitude regions using Scheffler solar concentrator
Published in International Journal of Sustainable Engineering, 2021
Himanshu Agrawal, Avadhesh Yadav
There are two different types of receivers used. All the two receivers are as follows: In case of direct heating copper crucible receiver cum ice-chamberIn case of natural flow and force flow rectangular receiver and ice-chamber