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Figure 6.72: Effects of turbine inlet pressure on both objective functions. An increase in ORC turbine inlet pressure reduces the heating load of the system while an increase in this pressure has a positive effect on cooling load of the system. An energy balance for a control volume around the ORC evaporator shows that when the energy input from biomass is constant, a reduction in turbine inlet enthalpy increases the ORC mass flow rate. Since inlet and outlet enthalpies of the generator in the absorption cycle are constant, an increase in the ORC mass flow rate leads to an increase in energy input to the absorption system, which increases the cooling load of the system. For the heating load, an increase in ORC turbine inlet pressure, while fixing other design parameters, decreases the turbine inlet enthalpy and, since the turbine outlet enthalpy is a function of the turbine inlet enthalpy and turbine isentropic efficiency, this a corresponding decrease in turbine outlet enthalpy (h28), which is the inlet energy for the heating process unit. Although the ORC mass flow rate increases as already discussed, the reduction in enthalpy of the heating process dominates. In addition, an increase in ORC turbine inlet pressure results in increase in the ORC mass flow rate entering the turbine which results in an increase in turbine output work. Therefore, the combination of these effects leads to an increase in the system exergy efficiency. Fig. 6.72 also shows that an increase in turbine inlet pressure results in an increase in total cost rate of the system which is due to an increase in turbine purchase cost as the inlet pressure increases. As a result, an increase in ORC turbine inlet pressure has a negative and 183PDF Image | Energy Systems for Multigeneration Purposes
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