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Output from an appropriately sized ORC would be about 1.25 MW with a total installed cost of $3.45 million. Assuming this system would run, at most, 3,000 hours per year which would save $562,500 (assuming $0.15/kWh) per year for a six year payback. Figure 4. CHP Plant ORC Bottoming Cycle Payback As seen in the graph above, by varying the cost of electricity and the operating hours per year, the payback of a 1.25 MW ORC system for use as a bottoming cycle on the Rutgers Cogeneration Facility varies largely. Ideally, if this system were run constantly throughout the year the average payback period would decrease by more than one half. In its current set-up, the heat generated at Rutgers CHP plant is already depended upon in the heating and cooling months. This reduces the availability of the waste heat and, in turn, significantly, spikes the length of the payback period. Conclusions The organic Rankine cycle system is a useful technology for waste heat recovery. There are multiple systems commercially available worldwide. At this time it appears that ORC systems are best suited for low grade waste heat recovery. There is no debate on the usefulness and benefits of organic Rankine cycles; however there is still delay on wide-spread implementation in the US. These systems have taken off, rather quickly, in Europe due to high electricity rates resulting in short payback periods. Currently, due to the relatively low cost of electricity in the US, there tends to be a requirement for year round operation of the ORC in order for it to be economically feasible. 1-20 ©2011 ACEEE Summer Study on Energy Efficiency in IndustryPDF Image | Economic Implementation of the Organic Rankine Cycle in Industry
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