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Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles

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Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles ( low-grade-heat-conversion-into-power-using-small-scale-organ )

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making RO the most suitable candidate for renewable energy powered desalination system. A solar driven ORC-RO system couples a solar thermal engine and a RO desalination sub- system (Figure 3.12). The solar thermal engine transforms the solar radiation into mechanical power. The useful power on the shaft by mechanical coupling drives the high pressure pump (HPP) of the RO unit. Figure 3.12 - Schematic of a Rankine driven reverse osmosis desalination system (ETC: solar thermal collectors; EV: evaporator; EX: expander; HPP: high pressure pump; P1, P2, P3: pumps, HT: hydraulic turbine; CD: condenser; RO: membrane modules; BR: brine; PE: permeate; SW: seawater; BW: brackish water) (Source: Tchanche et al., 2010) Early research on solar thermal driven pumping systems involving the Rankine power cycle started in the second half of the 19th century with the works of Augustin Mouchot and Abel Pifre (Delgado Torres, 2009). From that time till the end of the 20th century, the main application targeted was the small scale water pumping systems for irrigation of farms. Many systems operating on this scheme were built in many countries around the world as reported by Delgado-Torres (2009) and Wong & Sumathy (1999). These systems used steam or organic compounds such as R-11, R-114 and R-113 as working fluids. Solar driven irrigation systems are of special significance in countries where the economy relies on agricultural activities undertaken by poor farmers in remote areas far from electricity grid, and in a context of water scarcity and increasing oil prices. Since the 1980s, solar PV- water pumping systems favored by the decreasing cost of PV, modularity and less moving parts are being preferred to solar thermal pumping systems. At the moment the global warming is being considered as a major threat to our life, solar thermal engines are suggested for powering RO-desalination units. Earliest plant is reported to have been constructed in Cadarache, France (Maurel, 1979). The high pressure pump was powered by a 2.5 kW solar heat engine with R-114 as working fluid, and a fresh water production of 2.5 m3/ h from brackish water. Steam RC-ORC systems have been studied by Voros et al. (1998) and Bouzayani et al. (2007). These aforementioned theoretical studies were carried out considering steam temperature of about 450 °C at the turbine inlet. The implementation of organic fluids with appropriate critical temperature such as Toluene, siloxanes, ammonia, pentanes, etc in medium temperature ORC-RO systems is possible. Delgado Torres and Garcia-Rodriguez (2007), Garcia-Rodriguez and Delgado Torres (2007) and Bruno et al. (2008) carried out the technical and economic Page | 69

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