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Analysis of possibilities for 1MW electricity generation from waste heat in the port of Rotterdam Page 61 7 COMPARISON Now we will present the two alternative technologies, ORC and Kalina cycle, according to the evaluation criteria already defined in Chapter 2.3 and other features. ORC (isopentane) First law efficiency Second law efficiency IRR NPV Payback Safety of WF Investment O&M costs Minimum electricity selling price CS mass flow HS mass flow WF mass flow WF cost Turbine inlet pressure HS return temperature Complexity 9,54 % 36%-44% 6,18 % 195 k€ 9,9 years Toxic & corrosive 2,25 M€ 250 k€/year 81,72 €/MWh 133-289 kg/s 4,52 kg/s 26,56 kg/s 80-150 c€/kg 27 bar 80 oC 7,69 % 30%-36% 6,39 % 177 k€ 8,85 year Highly flammable 1,7 M€ 300 k€/year 82,05 €/MWh 256-356 kg/s 5,6 kg/s 16,1 kg/s 28–60 c€/kg 3,75 bar 85 oC Complex Simple Table 7.1 – Evaluation criteria of ORC and Kalina cycle Kalina cycle Regarding the efficiencies of the cycle, ORC seems better because they are higher. This is in contradiction with most of the results of the literature - Kalina cycle is more efficient at a 100oC source temperature. One possible explanation is that the Kalina cycle has more exergy losses because it has more components (2 internal regenerators and 2 nodes). Regarding the required mass flows, we cannot point out which one is better: the WF mass flow is higher for ORC system but the CS mass flow is higher for Kalina cycle. EVALUATION CRITERIAPDF Image | 1MW electricity generation from waste heat port of Rotterdam
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