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Modular Trough Power Plant Cycle and Systems Analysis

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Modular Trough Power Plant Cycle and Systems Analysis ( modular-trough-power-plant-cycle-and-systems-analysis )

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SF-IN SF-OUT HXM LIQ-3 AIR-OUT ACC B2 COMPR VAP-1 TURB1 ACC-IN AIR-IN1 ACC-OUT AIR-IN PUMP LIQ-1 Figure 4. Schematic drawing of the basic ORC (software from Aspen Technology, Inc.) 3.2.2. ORC with a Recuperator using Pure Hydrocarbons In the analysis of ORC with a recuperator using pure hydrocarbons (Figure 5), the resource entered the heat exchanger at 580°F (304°C), and its exit temperature was 344°F (173.3°C). The working fluid, Pentane, was pumped from a pressure of 20 psia (0.138 MPa) at 114°F (45.6°C) (saturated liquid conditions) to a pressure of 625 psia (4.31 MPa), where it was heated to a temperature of 325°F (162.8°C) inside a recuperator by the stream exiting the turbine. The pressure drop inside the recuperator was assumed to be 15 psia (103.4 kPa) and inside the heater/boiler was 10 psia (68.9 kPa). The working fluid was then passed through the main heat exchanger, where it was heated and boiled by the oil from solar field to a temperature of 563°F (295°C). The vapor exiting the boiler at 600 psia (4.14 MPa) was then passed through a turbine and was allowed to expand to 24 psia (0.165 MPa). The stream exiting the turbine was passed through a recuperator to heat the feed working fluid. The stream exiting the recuperator was sent through an air-cooled condenser where the working fluid was completely condensed. The efficiency of this cycle, including the fan power for the air cooler and the pump power, is 20.1%, which is a significant improvement over the basic ORC case of the previous section. A total pressure drop of 4 psia (27.6 kPa) was assumed for the hot side of the recuperator and the air- cooled condenser. The heating and cooling curves for this cycle have been presented in Figures 6 10

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