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Automotive Radial Turbine Expander Design WHR

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Automotive Radial Turbine Expander Design WHR ( automotive-radial-turbine-expander-design-whr )

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63 3.3.2 Evaporator Modelling The evaporator is the heat exchanger where the heat transfers from the thermal oil (exhaust gas in the second model) to the organic fluid. The organic fluid leaves the pump, enters the evaporator as compressed liquid and then leaves as superheated vapour after exchanging heat with the thermal oil. The total energy that balances through the evaporator is expressed in equation(β€Ž3-1). π‘„πΈπ‘£π‘Žπ‘ = π‘šπ‘œπ‘–π‘™ π‘•π‘œπ‘–π‘™ ,𝑖𝑛 βˆ’ π‘•π‘œπ‘–π‘™ ,π‘œπ‘’π‘‘ = π‘šπ‘€π‘“ (𝑕𝑀𝑓 ,π‘œπ‘’π‘‘ βˆ’ 𝑕𝑀𝑓 ,𝑖𝑛 ) 3.3.3 Condenser Modelling (β€Ž3-1) The condenser is the heat exchanger where the heat transfers from the working fluid in a gaseous state to the cooling medium, which is air in this study. Therefore, the aim of the condenser is to reject the still heat in the working fluid to the cold sink with an isobaric process. The thermodynamic analysis of the condenser is similar to that of the evaporator. The energy balance through the condenser is expressed in equation(β€Ž3-2). 𝑄 =π‘š. 𝑕 βˆ’π‘• =π‘š. 𝑕 βˆ’π‘• π‘π‘œπ‘›π‘‘ 𝑀𝑓 𝑀𝑓,𝑖𝑛 𝑀𝑓,π‘œπ‘’π‘‘ 𝑒π‘₯𝑕 𝑒π‘₯𝑕,π‘œπ‘’π‘‘ 𝑒π‘₯𝑕,𝑖𝑛 (β€Ž3-2) Saturated liquid is assumed at the exit of the condenser with a sub- cooling of 2Β° to ensure a liquid phase at the pump inlet. Hence, the quality π‘₯ at the condenser exit is known. The condenser exit quality is likewise already known. Therefore, the thermodynamic properties can be calculated at the condenser exit using equation(β€Ž3-3). π‘₯ ,𝑇 =πΈπ‘œπ‘† 𝜌 ,𝑃 ,𝑓𝑙𝑒𝑖𝑑 (β€Ž3-3) π‘π‘œπ‘›π‘‘ ,π‘œπ‘’π‘‘ π‘π‘œπ‘›π‘‘ ,π‘œπ‘’π‘‘ π‘π‘œπ‘›π‘‘ ,π‘œπ‘’π‘‘ π‘π‘œπ‘›π‘‘ ,π‘œπ‘’π‘‘ 3.3.4 Pump Modelling The pump is assumed to be electrically powered with the absence of leakages and for adiabatic operation. Its efficiencyπœ‚π‘π‘’π‘šπ‘ , as shown in

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