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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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Figure 6.18: Variations with pressure of high-pressure steam, PHP, on system energy and exergy efficiencies. It is found that the CHP exergy efficiency increases with the HP steam pressure if the turbine exhaust temperature is relatively high. The multigeneration exergy efficiency also increases with increasing process heat pressure, but the increase in multigeneration exergy efficiency is more significant than CHP. It is also shown that exergy efficiency of the power generation cycle does not change with high pressure as it is the upper cycle and it does not include any heating or cooling in its definition. An increase in high pressure leads to an increase in the turbine inlet enthalpy which finally results in an increase in turbine power output. Fig. 6.19 shows this trend. An increase in high pressure also has an effect on ORC power output as shown in Fig. 6.19. Fig.6.20 shows the effect of varying evaporator temperature in the absorption cycle on the system performance, in terms of exergy efficiencies. The exergy efficiencies of both the gas turbine cycle and the CHP system are not significantly dependent on evaporator temperature. The exergy efficiency of the multigeneration cycle also increases with increasing evaporator temperature, but the increase is small because the exergy associated with the cold is small. Generally, evaporator temperature does not have a significant effect on the system performance. 130

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Energy Systems for Multigeneration Purposes

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