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2.5.3.3 Regenerative Rankine cycle with feedliquid heaters Evaporator (a) 5 Turbine 7 4 6 Condenser 2 6 Turbine 5 4 6 17 P 3 23 P1 Evaporator Open feedliquid heater (b) 6 78 547 9 1 4P32P Pump Pump 9, 5 2 1 3 Mixing chamber Closed feedliquid 2 heater Condenser Entropy 8 Entropy Figure 2.15 – Regenerative Rankine cycles with: (a) Open feedliquid heater and (b) Closed feedliquid heater A constant preoccupation in fossil, biomass or solar fired Rankine based power plants is the efficiency; it should be as high as possible. The increase in efficiency is associated with the mean temperature in the evaporator. A way to increase this temperature is to incorporate into the cycle specific types of heat exchangers known as feedliquid heaters. There are two types of feedliquid heaters (Çengel and Boles, 2002). An open feedliquid heater (Figure 2.15a) is a mixing chamber where the feedliquid (2) and the extracted fluid (6) from the turbine mix. In a closed feedliquid heater (Figure 2.15b), heat from the extracted fluid (7) is transferred to the feedliquid (2) without any mixing taking place. Feedliquid heaters not only improve the thermal efficiency of the power plant, but also contribute to the de-aeration of the system and to the control of the working fluid mass flow rate. Mago et al. (2007; 2008), showed that open feedliquid heaters not only improve the energy efficiency of the organic Rankine cycle system, but also improve the exergy Page | 49 Temperature TemperaturePDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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