Energy Systems for Multigeneration Purposes

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

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energy inputted to the OTEC evaporator. Therefore, using the energy balance equation for a control volume around the evaporator, the mass flow rate of the OTEC working fluid increases which finally results in an increase in the turbine work. Figure 6.84: Effects of varying seawater warm surface mass flow rate on the net power output and total cost rate of the system It is also observed form this figure that an increase in warm surface mass flow rate results in an increase in the total cost of the system. This is due to an increase in the purchase cost of the turbine and warm surface working pump as the turbine and pump work increases and as a results the total cost of the system which is the summation of all purchase cost increases. Since the main cycle of this integrated multigeneration system is OTEC system and it is dependent on the warm surface temperature, the effect of solar radiation intensity is significant. Fig. 6.85 shows the effect of solar radiation intensity on the exergy efficiency of the system. It is observed that an increase in solar radiation intensity increases the exergy efficiency of the integrated multigeneration system. This is due to the fact that an increase in solar intensity leads to an increase in the temperature of the warm surface. The higher the warm surface temperature, the higher the energy input to the OTEC evaporator which leads to an increase in the turbine work, which finally results in an increase in the system exergy efficiency. Fig. 6.85 also investigates the effect of condenser temperature on the exergy efficiency. It shows that an increase in condenser temperature reduces the exergy efficiency of the system. 195

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Energy Systems for Multigeneration Purposes

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