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very low considering that these systems need to compete with other sources of low temperature power generation. One large improvement can be made in the expander, considering isentropic efficiency is never close to the 70-80% achieved in the literature. Observations from disassembled scroll compressors show that many machine finishes on the scrolls could be improved greatly. One example is that the ends (top of the scroll height) of the involutes are very rough. When these mesh with the other scroll disk, there is a large amount of leakage (axial leakage especially) and friction produced which explains the overall drop in isentropic efficiency. Also some fluid is purposely bleed from the scroll assembly to keep the meshed scrolls from rubbing against the bearing seat that they sit on. This is a loss that should be avoided when manufacturing an expander for larger scale purpose. Even with oil lubrication available to reduce friction there is still considerable loss due to poor machining finishes. Improvements can be made with better finishing of mating surfaces, low friction coatings and better bearings. 6.4 Exergoeconomic Analysis The exergoeconomic cost balance equations were used in the analysis above to arrive at a cost rate of electricity for optimized exergy efficiency. The equation for exergy efficiency depends on the electrical power output and the amount of heat input. The maximized value of exergy efficiency does not necessarily represent the maximum power output for the system at that particular pressure ratio. When looking at Figure 6.45 it is apparent that the maximum power output occurs with a superheat of around 15 ̊C. This also corresponds to the lowest cost rate for electricity. Therefore applying the optimization techniques can be useful to find the lowest cost rate of electricity for the system. 94PDF Image | Exergoeconomic Analysis and Optimization of ORC
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