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the heat sources and heat sinks. The performances of different components as well as that of the system are evaluated in view of minimizing the exergy destroyed during the operation of the system at steady state. If the system is considered in equilibrium with the surroundings, and neglecting the kinetic and potential exergies, the exergy associated with any flow at any step of a process taking place in the cycle can be written as: . E i = M i [ h i - h o - To ( s i - s o ) ] ( 6 . 1 2 ) Where Mi, hi and si are the mass flow, the specific enthalpy and specific entropy of the point considered, respectively. ―o‖ refers to the conditions of the cold water supplied to the condenser. The exergy flow graph of the system is depicted in Figure 6.24. In practice, the exergy flows are measured indirectly trough thermodynamic parameters recorded during the operation of the system. The pump consumption is measured with an electricity meter and the shaft power is deduced after the measurement of the torque and shaft rotational speed. Er,su,ev1 E.EE r,su,p W p a,su,ev1 Ea,ex,ev1 Ea,su,ev2 Er,su,ev2 EE r,su,ev3 Ea,su,ev3 Er,ex,cd Figure 6.24 - Exergy flow graph . Wsh r,ex,ev3 Er,ex,ev2 a,ex,ev2 Er,su,exp Er,ex,exp Ew,ex,cd Er,su,cd E w,su,cd Page | 156PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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