Environmental Engineering Reference
In-Depth Information
2
Boiler
3
Turbine
Pump
Condenser
1
4
FIGURE 7.12
Rankine steam cycle power generation. (From Cengel, Y.A., and Boles, M.A. 1994.
Thermodynamics
:
An Engineering Approach
. McGraw Hill, New York. With permission.)
TABLE 7.12
Primary CSP Technologies
Parabolic
Trough
Technology
PowerTower
StirlingDish
Description
Linear trough
solar
concentration to
steam turbine
power cycle
Heliostat
mirror array
with central
tower
receiver
Point focus, fluid
expansion,
electricity
generation in
Stirling engine
Sun to electric
efficiency
14%
16%
20%
Concentration
factor
100 suns
1000 suns
3000 suns
Heat transfer fluid
temperature
400°C oil
600°C molten
salt
725°C oil
Space requirement
5 acres/MW
8 acres/MW
4 acres/MW
Advantage
Most developed
CSP (SEGS)
TES easily
incorporated
Modular, low
investment cost
Disadvantage
Cooling water
required for
turbine cycle
cooling
Large area
requirement
Difficult to
incorporate TES
of steam through the turbine, (4) constant pressure condensation of the steam
back into water.
The three proven CSP technologies for collection, concentration, and
generation of solar power are the parabolic trough, the solar power tower,
and the Stirling dish engine. Each has a different geometry and associated
concentration of solar energy on the absorber. Parabolic troughs and power
towers are the most advanced systems for large scale power production and
incorporation of TES. Table 7.12 compares properties of these CSP concepts.
