A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...

Spillage: The radiation which is reflected from the concentrator subsystem
but which misses the receiver’s absorber surface.
Storage Capacity: The amount of net energy (MWth-hr) which can be de-
livered from a fully charged storage subsystem.
Storage-Coupled: The use of an energy storage system to permit operation
of the end-use system during periods when solar energy from the receiver cannot
satisfy the load.
Stow: A position or act of reaching a position of safe storage for the he-
lios tats.
Sun Position: The azimuth and elevation angles for specifying the direction
to the central ray from the sun.
Sunshape: The relative intensity of solar energy across the solar disk.
Ten Megawatt Electric (10 MWe) Solar Thermal Central Receiver
Pilot Plant (also known as Solar One): A prototype solar thermal central re-
ceiver power system near Barstow, California. The plant has been operating since
1981 with the capability of producing 10 MWe of electricity for use in the South-
ern California Edison utility system.
Thermal Energy Storage Subsystem: A rechargeable unit capable of
storing thermal energy for later use. Examples are storage as sensible heat in ni-
trate salt, sodium, rocks, water, or oil.
Thermocline Storage: The storage of thermal energy in which the hot and
cold media are in the same container (tank) and which uses the thermocline prin-
ciple. Such storage relies on a lower density hot fluid floating atop a higher den-
sity cooler fluid of the same type, or on hot solid material being separated from
cooler solid materials by a thermal gradient as in air-rock, air-ceramic-brick ap-
plications. The thermocline is the zone or layer in which the vertical temperature
profile changes rapidly.
Trace Heating: See Heat Tracing.
Tracking Systems: The motors, gears, and actuators that are instructed by
computer command to maintain a proper heliostat orientation with respect to the
sun and receiver positions.
Turbine-Generator: The component which converts thermal energy into
electrical energy.
Working Fluid (also known as Heat Transport Fluid): The fluid that
performs work for the end-use system-for example, the steam in a steam turbine-
generating system, hot gas in a Brayton cycle gas turbine, or fluid providing ther-
mal energy for a process heat application. The Working Fluid may or may not be
the Receiver Fluid. See Receiver Fluid; Heat Exchanger.
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