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exchanger. It can then be concluded that the condenser exhaust subcooling is imposed by the refrigerant charge & heat transfer surface area in the condenser. The condensing temperature is fixed by the pinch, the coolant temperature and the temperature rise. The condensing pressure is imposed by the condenser effectiveness and by the cold stream temperature. Pressure drops are mainly a function of the heat exchanger geometrical characteristics, bends and the flow rate. 5.2 Sensitivity study 5.2.1 Increasing maximum ORC pressure Consider the cooling of a waste heat stream, as shown in figure 47. Given that the waste heat is initially at a temperature T1. Then maximum heat recovery is obtained when it is cooled to the ambient temperature, T3. However, when cooled to an intermediate temperature T2, the amount of heat Q, is recovered with a heat recovery efficiency, Heat Recovery =QAbsorbed/QMaximum. Now in order to obtain the optimised power output, the conversion efficiency is then calculated asCovnersion =Cycle .HeatRecovery . T1 T2 Figure 47 Heat transfer as a function of temperature for single phase heating medium Keeping fixed waste heat inlet conditions, expander efficiency and expander exit dryness at X=0.99. The effect of varying the feed pump pressure on the ORC’s net power output is analysed. As the pressure and temperature of the working fluid in the boiler is increased for the fixed pinch point, the exit temperature of the waste heat source also increases, resulting in 85 T3PDF Image | study of ORC with the expansion process twin screw machines
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