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Chapter 3 Working hypotheses and preliminary analysis Turboden indicates that turbine efficiency can achieve up to 85%, therefore 83% has been chosen. Evaporator effectiveness is not expressly indicated, as both inlet and outlet temperatures are fixed and thus the effectiveness itself is obtained accordingly: however, this parameter results equal to about 90% with the given values (that leads to the mentioned pinch difference temperature of 20°C). Recovery heat exchanger is applied in all cases in which exhaust hot gases, having any origin, are available. Duratherm 630 has been chosen as thermal oil: its working temperature range (-9.4 ÷ 329.4°C) makes it suitable for the application. Concerning benzene mass flow rate, for the high temperature CHP case this parameter was chosen in order to generate about 100 kWel, 1 MWel and 5 MWel in the three different cases, and in particular: • 100 kWel: 1 kg/s • 1 MWel: 10 kg/s • 5 MWel: 50 kg/s On the other hand, given the thermodynamic parameters of the cycle, in low- temperature configurations, this mass flow rate depends on the available thermal power and consequently varies from case to case. Concluding, it can be verified that with all these assumptions, simulations of such plants provide analogous results to those declared by the manufacturer and obtained in the cited literature works. Actual results will however be shown in the next chapter, in order to present them together with the performance of the other plants, thus allowing a clearer comparison. 3.5.5 Biomass devices In this last section, design data of the biomass devices are finally presented. They are: gasifier (minor technical data are now shown, in addition to the main ones already discussed in Section 3.3.2), dryer, combustion devices (combustor for gas turbines and furnace for ORCs) and filters. Their features are summarised in Table 3.11. It is important to point out that, differently from what happens with syngas in gasifiers, ThermoflexTM calculates the quantity of dust produced during the combustion of solid biomass and therefore filters have a concrete effect on flue gases cleaning. Nevertheless 126PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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