NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.

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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications. ( nester-ryan-timothy-organic-rankine-cycles-comparative-study )

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As can be seen from Figure 3.4 the cost of electricity produced by the ORC and the cost of the electricity consumed by the ORC are linear functions of the price of electricity. Both of these values increase linearly with an increase in the price of electricity. The simple payback period appears to be an exponential decay with the increase in the price of electricity. Since the cost of the ORC does not depend on the price of electricity and the power produced is essentially free power because it was previously wasted to the atmosphere the payback decreases with the increasing price of electricity. If the price of electricity increases to about $0.16/kWh the ORC will pay back in one year. This previous analysis neglects the changing costs of electricity while the ORC is implemented and is meant to serve as a guide of when the ORC should be purchased and installed if the price of electricity were a main factor affecting the implementation of the ORC. The second economic analysis performed on the facility and the ORC application was assuming that the facility was taking out a loan to pay for the ORC, then the loan payments and interest was calculated for each year. The results are shown below in Table 3.2b and the assumptions in table 3.2a. Table 3.2a: Loan Assumptions Loan Principal Interest Loan Term (yr) CRF (1/yr) Payments ($/yr) Tax Bracket $ 280,000.00 0.08 Energy Savings (kWh/yr) Price at t=0 ($/kWh) Savings t=0 ($/yr) Escalating at (1/yr) Personal Discount Rate 1878240 $ 0.0549 $ 103,115.38 0.05 0.10 $ 20 0.101852209 28,518.62 0.305 68

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