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Figure 6.7: Variations with compressor pressure ratio of energy and exergy efficiencies This observation is due to the fact that the flue gases from the gas turbine are used to produce the cold in the multigeneration plant. The exergy efficiency of the multigeneration cycle is slightly higher than that of the cogeneration cycle because the exergy associated with the cooling load is small.Fig. 6.8 shows the variation with compressor pressure ratio of both exergy efficiency and exergy destruction rate for the system. 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 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 (see Fig. 6.9). Fig. 6.10 shows the variation with compressor pressure ratio of both heating and cooling load for the system. It is observed that both heating and cooling load of the system decreases as compressor pressure ratio increases. It is due to the fact that an increase in pressure ratio results in a decrease in both gas turbine outlet temperature and gas turbine mass flow rate which is the inlet energy for the bottoming cycles which are Rankine and absorption chiller systems. The more the input energy the higher the heating and cooling load can be achieved. 123PDF Image | Energy Systems for Multigeneration Purposes
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