Nexant Parabolic Trough Solar Power Plant Systems Analysis

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Nexant Parabolic Trough Solar Power Plant Systems Analysis ( nexant-parabolic-trough-solar-power-plant-systems-analysis )

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3. Wet Heat Rejection The procedure for estimating the performance of a plant with a wet mechanical draft cooling tower is outlined below. 3.1 Rankine Cycle The Rankine cycle design for a plant with a wet heat rejection system follows very closely the design for a plant with a dry heat rejection system. The principal changes are the deletion of the air cooled condenser, and the addition of a surface condenser, the wet cooling towers, a circulating water pump, and a makeup water source. The GateCycle flow diagram is shown in Figure 7. The design condenser pressure is 1.23 lbf/in2 for both the dry and the wet heat rejection systems; thus, the gross cycle efficiency is 0.375 for both plants. 3.2 Wet Cooling Tower Capacity The capacities of the wet cooling tower were selected by the GateCycle program, based on a dry bulb temperature of 106 °F and a coincident wet bulb temperature of 68 °F. This combination of temperatures is not expected to be exceeded for all but 1 percent of the hours each year. The characteristics of the cooling tower are summarized in Table 4. Table 4 Wet Cooling Tower Design Parameters Parameter Condenser pressure, in. HgA 2.5 Approach to wet bulb temperature, °F 12.3 Circulating water range, °F Cells, each Total fan power, kWe Water consumption, lbm/hr - Blowdown - Evaporation - Drift - Total 21.1 3 881 154,694 531,620 22,513 ---------- 708,827 Task 2 Wet/Dry Heat Rejection Analysis Value - 11 -

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