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0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Energy efficiency Exergy efficiency Figure 6.5: Energy and exergy efficiency for the subsystems of the multigeneration system. 6.2.2.1 Effect of varying compressor pressure ratio on system performance Compressor pressure ratio (rAC) significantly affects system performance like energy and exergy efficiencies. Fig.6.6 shows the variation with compressor pressure ratio of exergy efficiencies, for the system and its sections like power generation. It is observed that fuel consumption decreases as the compressor pressure ratio increases, mainly due to the increase of the air temperature entering the combustion chamber and the corresponding reduction in fuel consumption. The exergy efficiency of the multigeneration cycle is observed to increase with gas turbine isentropic efficiency, due to the corresponding increase in product yield. In addition, it can be seen that there is a sharp increase in exergy efficiency first. The reason is that, at lower pressure ratios, increasing the pressure ratio increases the outlet temperature of the compressor and decreases the fuel mass flow rate injected to the combustion chamber, increasing the efficiency. However, at a certain air compressor pressure ratio, increasing rAC increases the compressor work more than it decreases the fuel mass flow rate. This effect leads to a decrease in the output power. Consequently, the network output first increases significantly and then decreases as compressor pressure ratio increases. 121 EfficiencyPDF Image | Energy Systems for Multigeneration Purposes
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