Page 47 - Design of Solar Thermal Power Plants

TABLE 1.6 Feature Comparison of Softwares for Calculating Annual Mean Optical
Performance of Heliostat Concentration Fields
Model RCELL WINDELSOL ASPOC
Arrangement Radial staggered/ Radial staggered Radial staggered
pattern northesouth staggered/
Radial cornfield/
northesouth cornfield
Performance Annual calculation time Annual 4-Degree
calculation points: 200 calculation time polynomial fit for
Minimum solar points: 29 5-day energy data
altitude: 0 Minimum solar 4-Degree
altitude: polynomial fit for
15 degrees a daily 9 h energy
value
Definition of Northesouth square of 12 12 Units 8 10 Units with
unit and 11 11 or 21 21 units with specified specified space
quantity Dimensions of the unit space Energy
are related to the height Radial size of calculation for the
of the tower each unit is heliostat at the
Performance calculation related to the center of each
for the center of each unit height of the unit
No quantity restriction tower
for unit Performance
calculation for
each unit
Annual University of Houston’s Improved Gauss energy
energy energy flux model Houston energy flow distribution
Truncation factor is not flow model model
related to time Use annual mean Use the hour
Shadow and shade losses truncation factor truncation factor
in annual mean values Calculate annual Calculate the
(not related to the height mean shadow hourly shadow
of the tower) and shade losses and shade losses
(not related to related to the
the height of the height of the
tower) tower
Density Differentradialspaceand To be provided Radial space and
circumferentialspacefor with space circumferential
correspondingunits parameter from space are
Circumferential spaces of the external determined by
various units are source three individual
equivalent to each other variables
during optimization and
are determined through
minimum unit energy
cost optimization
Radial space is
determined according to
terrain and shading
design
Memo Calculate shadow and Consider Consider shadow
shade losses of 48 shadow and and shade losses
neighboring heliostats shade losses of of neighboring
12 neighboring heliostats within
heliostats a radius of 50 m