Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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26 Recuperator effectiveness is defined as: ε = hin − hout [3.1.6] hin −hout,min where hin and hout correspond to the inlet and outlet states of the minimum capacitance working fluid stream. In most organic Rankine cycle recuperators, the stream with the minimum capacitance rate will be the turbine exhaust (h2 and h3). hout,min represents the minimum possible exit enthalpy for the smaller capacitance rate stream. Thus, in most cases, as ε approaches 1, the hot fluid exiting the recuperator (turbine exhaust) approaches the cold fluid inlet temperature. As with the boiler, the energy balance reduces to the following form allowing state 6 to be constrained: & Qrecuperator = m&WF (h2 − h3 ) = m&WF (h6 − h5 ) [3.1.7] Condenser Like the boiler, the condenser is governed by a pinch-point temperature parameter. The pressure at state 4 is the saturation pressure corresponding to the condensing temperature. Figure 3.6 shows the flows associated with the condenser. Figure 3.6: Flow directions in the condenser Total heat rejection and coolant exit conditions are again calculated with an energy balance around the condenser: & Qcondenser = m&WF (h3 − h4 ) = m&coolant (hcoolant,out − hcoolant,in ) [3.1.8] Pump Pump performance is governed by an isentropic efficiency. Figure 3.7 shows the fluid flows associated with the pump.

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