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CHAPTER 2: Organic Rankine Cycle ā Literature Review Figure 2-17 Working principle of the screw expander (Zhejiang Turbine Import & Export Trade Co. 2011) Leibowitz et al. (2006) carried out development and experimental study of a cost effective ORC system with twin screw expander and R124 as working fluid with power ranging from 20kWE to 25kWE. They performed the modelling of two screw expanders as symmetric and āNā types and considered the effect of wet expansion on their performance. The results of demonstration unit estimated a total cost in the range of $1,500 to $2,000/kWE, depending on size. Wang et al. (2011) tested a single screw expander to verify its performance under various operating conditions such as different intake flow, different humidity, constant torque, and constant rotational speed, though, they used air as the working fluid. The reported results showed a total power of 5kW with the inlet pressure of 600kPa, rotational speed of 2850rpm and the maximum total efficiency of 32.5%. They suggested that single screw expanders has good part load characteristics but with poor expander efficiencies in the range of 20% to 30% which was mainly due to the lubrication problems. Ziviani et al. (2014) carried out a detailed geometry-based modelling of screw expander for waste heat recovery with the ORC. They developed a rotation-dependent function that describes the geometry of the screw rotors and the engaging surfaces, heat losses, oil-flooded mixing and leakage paths and also validated it with the published studies. 41 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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