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Chapter 5 Economic analysis Unit m2 k€ €/kWel €/kWel 1 MWel 5 MWel 3547 2660 2232 2151 532 446 430 470 500 100 kWel 173.4 130 1019 148 941 151 883 1300 1019 1480 941 1510 883 1430 948 1500 1000 Apart from the gas turbine and the heat exchanger, all the other devices (such as, combustor, high temperature filters, etc) should then be additionally considered: in this work these contributions have been quantified as 50% of the sum of the two previous cost items: final results are therefore those reported in Table 5.1. Investment costs of the combined solutions of an internal combustion engine or a gas turbine coupled with a gasifier and bottoming ORC (ICE GAS ORC and GT GAS ORC) are naturally given by the sum of the already mentioned ICE GAS or GT GAS REG PRES costs and the one of the ORC unit. Differently from what has been done up to now, in this case the evaluation must take into account the actual power output of the plants, since the additional power produced by the ORC varies according to the thermal power contained in the hot exhaust gases feeding the thermodynamic cycle and can obviously not be catalogued in advance as 100 kWel, 1 MWel or 5 MWel. In particular, actual ORC power values are listed below. Two values are provided for each solution, concerning respectively the CHP and the electric case. • ICE GAS ORC: 259 ÷ 351 kWel • GT GAS REG PRES (1 MWel): 142 ÷ 192 kWel • GT GAS REG PRES (5 MWel): 587 ÷ 794 kWel According to [5.3] and [5.4], the following installation costs regarding the ORC unit and the thermal oil circuit can be adopted for these sizes: • ICE GAS ORC: 2300 €/kWel Heat exchanger area [3.5] 1359 Heat exchanger cost Heat exchanger specific cost (to power output) 3 × [5.1] 3 × [5.2] [3.5] 3 × [5.1] 3 × [5.2] Average specific cost Chosen specific cost €/kWel Table 5.2 – Cost of ceramic/high temperature heat exchangers. 174PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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