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Nominally, both plants show a 5 percent reduction in gross output and gross efficiency if the ambient temperature increases from the design point of 70 F to a hot day temperature of 108 F. This is not a completely representative set of annual performance analyses, and the auxiliary energy demands of the pumps and fans are not included here. However, the trends in the above figures indicate a performance penalty for a parabolic trough plant compared to a tower plant is not as significant as shown in the above reference. 31 Appendix A. 32 WorleyParsons. (2008). FPLE - Beacon Solar Energy Project: Dry Cooling Evaluation. WorleyParsons Report No. FPLS-0-LI-450-0001. WorleyParsons Job No. 52002501. pp. 15-17, Tables 6, 7 and 8. 33 Morris, P., Maulbetsch, J.S., DiFilippo, M.N. (2005). Spray Enhancement of ACC Performance at Crockett Cogeneration Plant. CEC/EPRI Advanced Cooling Strategies/Technologies Conference. Sacramento, CA. 34 "Engineering and Economic Assessment of Advanced Air-Cooling Technologies for Steam-Rankine Power Systems," by Bharathan, et al. The study compares a conventional air-cooled plant to a Heller cycle. The total capital cost of the Heller cycle components was $10.5 million compared to the ACC cost of $7.1 million. They claim the Heller cycle allows some performance improvement due to lower condenser pressures (less back pressure on the turbine), especially on hot days when the cooling water circulation rate can be increased. Table 5.4 (pg. 49) shows an overall economic advantage for Heller due to an improvement in the heat rate. But on pg. 50, they refer to the reduced condenser pressure in the Heller cycle and conclude, "However, the overall economics of this advantage are uncertain because of the lack of domestic capital and operating costs and performance information for this type of steam condensing system." 35 Angelino, G., Invernizzi, C. Binary conversion cycles for concentrating solar power technology, Solar EnergyIn Press, Corrected Proof, , Available online 20 February 2008. Retrieved from: (http://www.sciencedirect.com/science/article/B6V50-4RW9H0T- 1/1/378ad00ada48ff5adcae3196f76d937a) and Heller P., Pfander M., Denk T., Tellez F., Valverde A., Fernandez J., Ring A. Test and evaluation of a solar powered gas turbine system (2006) Solar Energy, 80 (10), pp. 1225-1230. Retrieved from Science Direct Database Page 24 of 24PDF Image | Concentrating Solar Power Commercial Application
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