Page 10 - Design of Solar Thermal Power Plants
P. 10

1.1 GENERAL PRINCIPLES OF SOLAR THERMAL POWER PLANT DESIGN  3

           TABLE 1.1 Comparison of Solar Thermal Power Generation and Solar Photovoltaic
                      Power Generation
           Items to Be                               Photovoltaic Power
           Compared          Solar Thermal Power     Generation
           Power Generation  sunlight energy- thermal  Photoelectric effect of materials,
           Mechanism         energy-power, with working  sunlight energy-power,without
                             process                 working process
           Definition of      Annual mean efficiency,  Peak value efficiency,
           Efficiency         Generation energy/annual  generation power/input
                             solar irradiation, kWh/kWh  power, kW/kW
           Capacity          No scale limits; dish system  No scale limits; can be either
                             is suitable for distributed  separately applied, or applied
                             power generation; tower-  in large-scale project
                             type and parabolic trough
                             systems are suitable for
                             large-scale projects
           Solar Spectrum    300e3000 nm             300e600 nm
           Power Quality     Small load fluctuation, high  Large fluctuation without
                             quality                 power storage impacts on
                                                     power grid, poor quality
           Cost              high                    lower


              it is not possible to simply apply conventional materials systems.
              These technical considerations pose challenges to the conventional
              techniques being applied right now. The development of large-
              scale, highly efficient CSP cycle technologies requires new and
              further research on highly efficient concentrator fields, unsteady
              high-temperature heat transfer and thermal storage mechanisms,
              materials design, reliability of the CSP-generation system and its
              recurring effects on the overall system, etc.
           3. Differences between CSP generation and solar photovoltaic power
              generation. The two solar energy power generation modes are
              compared in Table 1.1.


               1.1 GENERAL PRINCIPLES OF SOLAR THERMAL
                             POWER PLANT DESIGN

              Design of the CSP plant shall follow the general principles of (1)
           tallying to national conditions, advances in technology, economic feasi-
           bility, and operating in a safe and reliable manner; (2) striving for eco-
           nomic and social benefits, saving energy, engineering investment, and
           raw materials, and shortening the construction period; and (3) being in
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