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and 7. Figure 7 shows that by using a recuperator the working fluid temperature entering the condenser was reduced to 172°F (78°C) instead of the 433°F (223°C) observed in the basic ORC case. The schematic diagram of the cycle (Software from Aspen Technology, Inc.) is shown in Figure 8 and the corresponding state points have been listed in Table 3. Figure 5. Organic Rankine cycle with recuperation Figure 6 shows that by choosing a supercritical pressure of 610 psia (4.2 MPa) for the boiler, the heating curve of the working fluid matches the cooling curve of the solar heat transfer fluid very closely, thus reducing the irreversibilities that occur in the boiler. The cooling curve of the working fluid, as shown in Figure 7, shows that the condensation occurs at a constant temperature (except for the pressure drop effect in the piping). The pinch point of 13°F (7.2°C) occurs at the start of condensation. Note that a conservative condensing pressure of 20 psia (0.138 MPa) was chosen for this analysis. It is possible to condense this working fluid at pressures as low as 15 psia (0.103 MPa); however, an above-atmospheric condensing pressure is very desirable for this cycle. It is also necessary to optimize the condensing pressure with respect to the cycle efficiency. This type of optimization or sensitivity will be discussed later in this report. It is possible to increase the effective area of the recuperator to enhance the performance of the cycle; however, proper precautions should be taken into account for the pressure drop and the heat transfer coefficient inside the recuperator when the area is increased. Our preliminary analysis showed that doubling the size of the recuperator resulted in a 10% increase in the overall cycle efficiency. This option will be further analyzed in the optimization section reported later in this report. 11PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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