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Chapter 4 Thermodynamic analysis 80 70 60 50 40 30 20 10 0 1 MWel - GT ORC - First law efficiency SIM AMB SIM AMB SIM CHP EL PRES CHP SIM REG PRES EL AMB CHP REG AMB EL REG REG PRES PRES EL CHP Figure 4.22 – 1 MWel: first law efficiency of GT GAS ORC versions. First of all, it must be specified that heat recovery is being effected exploiting the residual heat contained in the flue gases exiting the gas/oil heat exchanger also in case of pure electric production. Thus first law efficiency is not equal to electrical one neither in these cases. In general one can observe that pressurised solutions are more efficient than ambient pressure ones and that CHP configurations lead to slightly lower electrical efficiencies but much higher first law efficiencies than electric ones. Apart from this, Figure 4.21, shows that the regenerative cycle provides much better electric performance: a difference of 5 ÷ 6% with the corresponding simple cycle solutions has been found for all of the configurations. This means that the higher performance reached by the ORC in the latter case (due to the hotter thermal oil source) is not sufficient to compensate the regeneration effect in the gas turbine. Obviously an optimisation of the thermodynamic parameters could be performed, but it can be hypothesised that results would not change in qualitative terms, and however referring uniquely to the two described ORC configurations is considered more suitable. In conclusion, the regenerative cycle is preferable compared to the simple one (first law efficiencies are slightly lower, but obviously this can be neglected) and thus its four configurations will be considered hereinafter (naturally for the 5 MWel case, too). 158 First law efficiency [%]PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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