Power Tower

Power Towers use a number of heliostats (large sun tracking flat plane mirrors) to focus sunlight onto a central receiver situated on a tower, hence the name. In these systems, a working fluid (generally a high temperature synthetic oil or molten salt) is pumped through the receiver where it is heated to around 550oC. The heated fluid can then be used to generate steam for electricity generation.

Figure 6 Schematic of a power tower Image adapted from Energy Efficiency Renewable Energy Network.
Figure 7 Solar Two, power tower Image courtesy of NREL's Photographic Information Exchange.

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