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CHAPTER 2: Organic Rankine Cycle – Literature Review 2.7.3. Reciprocating piston expander Reciprocating piston expanders are complex devices that require accurate inlet and exhaust valve timing with excessive frictional losses due to the large number of moving parts. However, they have been widely used in the majority of ICEs WHR with ORC since a wet expansion can be tolerated with this kind of expander. Figure 2-18 details the working principle of the reciprocating piston expander. Figure 2-18 Working principle of reciprocating piston expander (Bloch et al. 2006) Glavatskaya et al. (2012) proposed a steady-state semi-empirical model of the reciprocating piston expander considering the ambient and mechanical losses and internal leakage. The model was validated with manufacturer’s data with a maximum deviation of 4.7%. The reported results showed that the maximum expander isentropic efficiency and volumetric efficiency are 70% and 60% respectively. Clemente et al. (2013) carried out the preliminary design of piston expander with the ORC using R245fa and n-pentane as the working fluids. It was shown that the maximum expander efficiency does not exceed 65% due to the low shaft speed. 42 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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