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Appendix A Further analysis stemming from the study conducted in the reference 1 of this Appendix, also referenced in footnote 13 of the main report evaluated the impact of hybrid cooling. 13Kelly, B. (2006). Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 2 Comparison of Wet and Dry Rankine Cycle Heat Rejection. National Renewable Energy Laboratory, NREL/SR-550-40163 1. Introduction The plant design parameters used for this analysis are as follows: • 274 MWe gross plant output • Two Rankine cycles, each with a nominal gross rating of 137 MWe • Two collector fields, each with an aperture area of 1,030,000 m2 • Two thermal storage systems, each with a nominal capacity of 1,096 MWht. The storage capacity is sufficient to operate the Rankine cycle at full load for 3 hours, and the energy from storage is dispatched such that the Rankine cycle is operated at full load for the fewest number of hours each day (i.e., no load shifting) • The 30-year solar radiation and weather file for Barstow, California is assumed to be applicable for A Southwest desert site • The design point for the wet heat rejection system is assumed to be as follows: 2.5 in. HgA condenser pressure; 104 °F dry bulb temperature; and 64 °F wet bulb temperature. • The design point for the dry heat rejection system is assumed to be as follows: 2.7 in. HgA turbine exhaust pressure; 2.5 in. HgA condenser pressure; and 70 °F dry bulb temperature. The 0.2 in. HgA difference between the turbine exhaust pressure and the condenser pressure is the pressure loss in the steam duct between the exhaust flange and the condenser inlet. The 70 °F dry bulb temperature is the result of the 2006 optimization study on wet and dry heat rejection systems (reference 1). Three heat rejection systems were evaluated: 1) A wet system, including mechanical draft cooling towers, a surface condenser, vacuum pumps, circulating water pumps, underground circulating water pipes, a water treatment system for cooling tower makeup, and an evaporation pond for the cooling tower blowdown. A schematic diagram of the system is shown in Figure 1. 2) A dry system, including an air cooled condenser and vacuum pumps. A schematic diagram is illustrated in Figure 2. iiPDF Image | Concentrating Solar Power Commercial Application
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