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Chapter 6: Case studies As shown in Figure 81, increasing the evaporating temperature leads to higher cycle efficiency and to lower collector efficiency. An optimal overall efficiency is stated around 150°C, which is just below the critical point (154°C for HFC- 245fa). The evaporating temperature also has an impact on the size of the different components. Figure 82 shows that with high evaporating temperature levels, smaller swept volumes are needed for both expanders since the inlet densities are higher. This is an appreciable advantage since the cost of the expanders is reduced. A similar effect is stated for the heat transfer area of the evaporator (Figure 83): for a given pressure drop, a higher vapor density allows reducing the Figure 82: Required swept volumes vs. evaporating temperature. Figure 83: Required heat transfer area vs. evaporation temperature. 13PDF Image | Organic Rankine Cycles for Waste Heat Recovery and Solar Uses
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