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Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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6.2.2.2 Effect of varying gas turbine inlet temperature (GTIT) on system performance The gas turbine inlet temperature (GTIT) is a significant design parameter in a gas turbine cycle. Raising this parameter can increase gas turbine output power. But an energy balance of the combustion chamber indicates that the fuel mass flow input rate also decreases as the GTIT rises (see Fig. 6.12). The decreased fuel input is also reflective of the increase in turbine exhaust temperature, following equations. (5.29) and (5.30). Fig. 6.13 shows the variations with turbine inlet temperature of the exergy efficiencies for the power generation, CHP and multigeneration cycles. The exergy efficiencies are observed to increase with increasing in turbine inlet temperature, because of the corresponding increase in net work output and relatively smaller increase in heat addition to the cycle. The same trend is observed for the exergy destruction rate which is shown in Fig. 6.14. Figure 6.12: Variations with gas turbine inlet temperature of total combustion chamber mass flow rate and flue gas mass flow rate. Fig. 6.15 shows the variation with GTIT of both heating and cooling load of the system. It is observed that an increase in GTIT results in an increase in both heating and cooling load of the system. This is due to the fact that an increase in GTIT leads to an increase in gas turbine outlet temperature while other parameters are fixed due to equation (5.29). 126

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