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Appendix A The cooling tower consists of 15 bays, each with a 300 bhp fan. The condensing section is fabricated from oval carbon steel tubes, with aluminum fins. The total heat transfer area, including the tubes and the fins, is approximately 5,250,000 ft2. A series of adjustments to the GateCycle operating logic were made under the following conditions: 1) For the dry heat rejection system, there are approximately 230 hours each year in which the combination of thermal input from the collector field and the ambient temperature would normally result in turbine exhaust pressures above the maximum allowable value of 8 in. HgA. For these hours, the thermal input to the steam generator is successively reduced in increments of 0.5 percent until the exhaust pressure decreases to 8 in. HgA. The annual thermal energy which cannot be converted to electric energy during these hours is recorded. 2) For the dry heat rejection system, condenser pressures below 1 in. HgA are possible on cold days, or on warm days with a small solar thermal input. To reduce the auxiliary electric demand during these hours, cooling towers fans are stopped in groups of 6 until the condenser pressure rises to at least 1 in. HgA. 3) For the wet heat rejection system, condenser pressures below 1 in. HgA are possible on cold days, or on warm days with a small solar thermal input. To reduce the auxiliary electric demand during these hours, cooling towers fans are stopped in succession until the condenser pressure rises to at least 1 in. HgA. 2.4 Hybrid Heat Rejection The required duty of the wet cooling tower in a hybrid system to achieve the desired condenser pressure of 2.5, 4, 6, or 8 in. HgA throughout the year is a function of the ambient temperature distribution and the parallel performance of the wet cooling tower and the air cooled condenser during the summer. The required duties are determined by means of an annual simulation of the plant performance, discussed below in Section 3.3. 3. Annual Performance Calculations The performance of the Rankine cycle is a function of the thermal input to the steam generator, and the ambient temperature. To estimate the annual performance of the plant, the following calculations were performed: 1) A weather file was compiled for a Southwest desert site, listing for each hour of the year, the dry bulb temperature, relative humidity, and direct normal solar radiation. viPDF Image | Concentrating Solar Power Commercial Application
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