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The reference plant in Table 15 has a solar field with 19,552 m2 of LS-2 parabolic trough collectors, 12 hours of thermal storage, and a capital cost of $7,349/kWe. The plant generates 4,644 MWh of electricity for an annual capacity factor of 54%. The solar field has an annual efficiency of 43.8% and an annual solar to electric efficiency of 8.1%. The initial energy price is about 20¢/kWh. Table 15. Reference Plant Design, Annual Performance, and Economics Reference Plant Design Solar multiple 2.6 Thermal storage (hrs) 12 Solar field area (m2) Capital cost (k$) Reference Plant Performance 19,552 $7,349 Annual solar field efficiency Annual heat losses from storage 2.9% Dumped energy (storage full) 3.1% Annual net electric output (MWhe) 4,644 Capacity factor @ 1 MWe 53% Annual solar to electric efficiency 8.1% Reference Plant Economics DSCR (minimum/average) Debt share 54% IRR 14% First-year energy price ($/kWh) 5.4 Influence of Ambient Temperature $0.201 43.8% 1.30/1.52 Because the ORC power cycle uses dry cooling, ambient air temperature has a significant impact on the power cycle efficiency. The ORC power cycle was evaluated for different ambient air temperatures. Figure 25 below shows how the design point electric output changes for temperatures other than 25°C. The efficiency improves at lower ambient temperatures and is significantly reduced at high ambient temperatures. 38PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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