Ex 1 ENERGY AND ECONOMIC ASSESSMENT OF A WIND TURBINE Text

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ENERGY AND ECONOMIC ASSESSMENT OF A WIND TURBINE Power Production from Renewable Energy– A.Y. 2020/21 Prof. Paolo Silva – Ing. Elena Crespi A company wants to evaluate the economic feasibility of the installation of a modern wind turbine Vestas V90GS. The turbine has a horizontal axis and a 3 -bladed rotor ; the nominal power is 1 ’800 kW and the operational wind speed ranges from 3 m/s (cut-in speed) to 25 m/s (cut-off speed). CASE A Consider the attached figure and table , which illustrate the wind speed distribution for the considered geographic location and the power curve values for the Vestas V9 0GS turbine (referring to ISO standard conditions). Consider a venture capital investment and the following plant costs: • Turbine and transportation 1’810’000 € • Plant design, engineering and work supervision 227’000 € • Civil works 403’000 € • Grid connection 277’000 € The annual average availability of the plant is 8600 hours and the O&M annual cost is 35’000€ in the first year, while in following years it has to be updated according to the inflation rate. Assume the following economic data: • plant life 20 years • inflation rate r inf = 0.5% • discount rate rdisc = 4.0% • tax rate rtax = 38% • financial amortization 12 years, constant shares • feed-in tariff Ffeed-in = 12.96 c€/kWh (1000-5000 kW range; DM 06/07/2012) • feed-in tariff duration 20 years The construction time of the plant is 2 years and the investment cost is split in two tranches: 55% during the first year of construction and 45% during the second year. Draw the curve of the power coefficient (Cp) of the turbine and c alculate the expected annual energy production, the capacity factor and the equivalent working time of the plant. Determine the performances of the investment (pay-back period, net…