Fort Hood solar cogeneration facility conceptual design study Page: 89 of 183
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
The collected energy is then deposited in high temperature storage. Energy is
then extracted from high temperature storage at a controlled rate and used to
generate steam for the turbine cycle. This rate is controlled to meet the demand
for space heating, hot water and absorption chilling if the load-following con-
figuration is being modeled. The turbine power is also constrained to stay within
its operating band of maximum and minimum rating. During periods when high
temperature storage is depleted, the gas-fired heater supplies the required
energy to the turbine cycle, as illustrated on Figure 3.4.2-4. .
The simulation of the maximum power/idle mode of operation is accomplished in
a similar manner. Turbine control, however, is more complicated. In this mode
it is usually desirable, during periods of solar collection, to run the turbine
at Its maximum rated power. This will tend to fill low temperature pressurized
water storage faster than it can be utilized, When the pressurized water storage
reaches full capacity, it will be necessary to "spill" the turbine exhaust energy
through the cooling tower. When this condition occurs, it is desirable to
reduce the turbine power to minimize spillage and begin to fill high temperature
storage. When high temperature storage also reaches capacity, the turbine again
goes into full rated power since it is more efficient to make electricity and
then spill energy.
The optimization of each configuration was prepared by varying the heliostat
area, high temperature storage, low temperature storage and chilled water
storage, turbine rating and control strategy. After determining the optimal
case for each configuration, the sensitivity of the cost/performance was
determined for these parameters. The sensitivity of the net present value of
the plant to heliostat field size is shown in Figure 3.4.2-5 for both the load-
following and maximum power/idle configuration. These curves illustrate the
benefit of increasing field size up to 14,000 m^. Beyond that point, the
increased spillage encountered during the spring and fall months redices the
cost effectiveness for the system. The final field layout uses 242 heliostats
for 13,700 m^ of mirror area. This same layout was considered close to optimal
for both configurations.
A 600 kWe turbine was selected for use with the load-following case since the
turbine selected should be large enough to meet the maximum exhaust steam
demand but no larger. The use of a small turbine permits the cycle to operate
72
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Fort Hood solar cogeneration facility conceptual design study, report, May 1, 1981; United States. (https://digital.library.unt.edu/ark:/67531/metadc1066964/m1/89/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.