Solar collectors
a solar collector and collector technology, applied in the field of solar collectors, can solve the problems of high startup and maintenance costs, affecting the maximum temperature,
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example 1
[0068]As an illustrative example, an increase of about 1% in solar to electric efficiency (for example, from 20% to 21%) results in an increase of (21-20) / 20=5% in the electricity produced by a plant for generating power with the aid of energy provided by solar collectors. Assuming that the total solar to electric efficiency of a trough (or solar collector)-based power plant is 20%, improvements in efficiency that reduce intercept losses and employ molten salts, as described above, may result in a final efficiency of 0.2*(1 / 0.9)*(0.4 / 0.35)=0.254, or about 25%. Electricity production may be increased by 25% relative to a standard trough plant. This effectively reduces the cost of generating power by the plant by about a quarter.
example 2
[0069]An array of solar collectors may include five solar collectors adjacent one another, as illustrated in
[0070]FIG. 2. The solar collectors include reflectors, an absorber tube running down array of reflectors, and receivers at focal points of the reflectors. Solar energy incident on the reflectors is reflected to the receivers. The receivers are spherical receivers, as illustrated in FIG. 5. A thermal energy transfer material including sodium nitrate and potassium nitrate (in a 3-to-2 ratio) is successively heated with the aid of the reflectors from an initial temperature of about 200° C. to a final temperature of about 600° C. The thermal energy storage material is then used to generate steam, which is subsequently used to generate power in a turbine.
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