A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
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caused by the tilt of the heliostat, proportional to the cosine of the angle of incli-<br />
nation of the normal of the heliostat surface to the sun’s rays.<br />
Cost/Per<strong>for</strong>mance Ratio: A measure used in comparing system design<br />
alternatives wherein both cost and system per<strong>for</strong>mance are taken into account.<br />
CRTF: The Central Receiver Test Facility at <strong>Sandia</strong> <strong>National</strong> Laboratories in<br />
Albuquerque, New Mexico.<br />
Design Point: The time of day and day in a year <strong>for</strong> which the system or<br />
component per<strong>for</strong>mance is specified.<br />
Direct Normal Insolation: The solar energy incident on a surface that<br />
comes from within the solid angle subtended by the solar disk; that sunshine<br />
which can cast a sharply defined shadow.<br />
Discount Rate: The annual rate used in present worth analyses that takes<br />
into account inflation and the potential earning power of money while moving the<br />
present worth <strong>for</strong>ward or backward to a single point in time <strong>for</strong> comparison of<br />
value.<br />
Diurnal: Recurring every day.<br />
DOE: The United States Department of Energy.<br />
Downcomer: The pipe carrying the hot heat transport fluid down the re-<br />
ceiver tower.<br />
Emissivity: The ratio of the radiant energy given off by a surface to that<br />
given off by a blackbody at the same temperature.<br />
End Use: The final use of the thermal output of a solar central receiver<br />
plant, e.g., in a turbine to generate electricity or in an industrial process.<br />
External Receiver: A solar energy receiver in which the solar radiation is<br />
absorbed on the external surfaces. External receiver configurations include bill-<br />
board (flat plate) and cylindrical.<br />
Fixed Charge Rate: The amount of revenue per dollar of capital expense<br />
that must be collected annually to pay <strong>for</strong> the fixed charges associated with plant<br />
ownership, e.g., return on equity, interest payment on debt, depreciation, income<br />
taxes, property taxes, insurance and repayment of initial investment. It may also<br />
include operations and maintenance expenses expressed as a fraction of the capi-<br />
tal cost.<br />
222<br />
Flux (Radiant): The time rate of flow of radiant energy.<br />
Flux Density: The radiant flux incident per unit area.