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Figure 3.6: Screw expander modified from (ElectraTherm Inc, 2011) 3.3.3 Scroll Expanders Scroll expanders are another type of positive displacement machine with a unique geometry. First patented by Leon Creux in 1905, commercially viable machines did not come out until proper tolerances could be achieved with machine tools. Scroll machines depend on tight tolerances to reduce leakages which can hinder performance. The geometry of the scroll is usually an involute of a circle. This produces a shape which resembles a spiral. An example of an involute of a circle in practice is a tether ball attached to a pole. When you wrap the string around the pole the ball gets closer to the pole while tracing out a spiral as it turns to wind around the pole. In practice two of these spiral shaped disks (scrolls) with spirals at height x are put together. One of these scrolls is fixed in place, while the other is free to move. The moving scroll orbits the fixed scroll while always keeping contact with each other to produce pockets of fluid which can either be compressed or expanded. The scroll machine is commonly used as a compressor for 24PDF Image | Exergoeconomic Analysis and Optimization of ORC
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