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For 20 years lifetime period, the value of the LEC for different system sizes is given in Figure 7.10. The LEC decreases as the size of the system increases, from 13.27 c€/kWh for a 2-kWe system down to 7c€/kWh for a 50-kWe system. From the above results, it can be predicted that medium and large size system could produce electricity at cost significantly lower, below 5 c€/kWh. Figure 7.10 - LEC for 20 years lifetime When the minimum price at which the electricity should be sold has been determined through the LEC calculation, the profitability can be studied through the NPV and DPP. Figure 7.11 shows the variation of the NPV and DPP for the reference system of 2 kWe output. The DPP is about 10 years, for an electricity price of 15 c€/kWh, 6 years for 20 c€/kWh, 4.3 years for 25 c€/kWh, 3.3 years for 30 c€/kWh and 2.3 years for 40 c€/kWh. These results prove that the small scale ORC-WHR is already economically viable for countries where the electricity price is above 15 c€/kWh such as Italy, Germany and Denmark (Europe‘s Energy Portal, 2010). In case of countries with low electricity prices such as Greece and Finland, this system will hardly be economically viable. Page | 177PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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