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CHAPTER 2: Organic Rankine Cycle – Literature Review 2.7.4. Rotary vane expander Rotary vane expander is originally air motor designed to use compressed air to drive rotors (Qiu et al. 2011). An air motor converts the energy of compressed air into mechanical energy. With significant modification of air motors (to prevent leakage in the case of organic fluids) they can operate in reverse to act as an expander. Figure 2-19 shows a schematic and exploded geometry of a typical rotary vane expander. The expansion process is obtained, when the chamber spaces between the cylinder wall and the sliding vanes slotted into the rotor increase as the rotor turns clockwise within the eccentric cylinder housing (Qiu et al. 2011). The organic fluid enters the vane expander form chamber “A” and commences the rotation. The trapped vapour is expanded as volume of the chamber increases until the leading vane of the chamber passes the outlet port (Qiu et al. 2011). Figure 2-19 Working principle of rotary vane expander (Qiu et al. 2011) Musthafah et al. (2010) conducted thermodynamic analysis of the expansion profiles of rotary vane expander used in the ORC with three working fluids as R245fa, ammonia and CO2 (supercritical). The reported results for expansion profiles showed a similarity at different hot side temperatures. They used this feature to introduce a variable mechanism for expansion 43 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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