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77 exhaust enthalpy, which can potentially increase the ORC system efficiency. Meanwhile, a high backpressure corresponds to a long and heavy heat exchanger, which can significantly affect the power-to-weight ratio of the vehicle. Figure 3-19 compares the two fluids considered in terms of the change in exhaust gas backpressure and extracted thermal energy from the exhaust gases or varying heat exchanger surface area. The extracted heat from increasing the heat exchanger length is increasingly diminished at the expense of the backpressure as the ΔT between the exhaust gases and the thermal oil approaches zero. This behaviour is observed for both fluids. However, the ORC that employs R1233zde can extract more energy before reaching its plateau. This outcome can be explained by Figure 3-21 and Figure 3-22. The temperature profile of the thermal oil for the R1233zde configuration follows the exhaust gases more closely (a large ΔT between the inlet and the outlet and a small mass flow rate). Thermodynamically, the ORC cycle that employs R1233zde is more efficient, meaning that it generates more power for the same heat input. Consequently, for the same ORC power output, R1233zde would require a smaller heat exchanger. Alternatively, for the same heat exchanger length, its temperature profile allows the extraction of more heat. Figure 3-19: Effect of thermal oil heat exchanger length on exhaust pressure drop and absorbed heat for both tested fluids.PDF Image | Automotive Radial Turbine Expander Design WHR
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