Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Sylvain Quoilin Chapter 5 : Models 5.4 Evaporator model Proposing a simple and accurate model for the evaporator is a complex task. It is indeed composed of two hot air sources and three heat exchangers. Depending on the test, the two­phase zone moves between the exchangers, making it very difficult to propose a global model for all the experiences. Inputs of the model : Ta,su,hx12 : Ta,su,ac : M ̇a : M ̇f : Tf,su,hx1 : pf,ex,hx3 : Tamb : Outputs of the model : Tf ,ex,ev Q ̇ e v  pev 5.4.2 First model First hot air source temperature Second hot air source temperature Air flow rate Refrigerant flow rate Evaporator supply temperature, refrigerant side Evaporator exhaust pressure Ambient temperature Exhaust refrigerant temperature Total heat transfer over the evaporator Pressure drop over the evaporator A first model is proposed for the first series of tests. It assumes that the two­phase zone is located over the two last exchangers HX2 and HX3, the first exchanger HX1 being filled only with liquid and working as a preheater. In the same manner as for the condenser, heat ambient losses are defined on the air side at the exhaust of each exchanger. Two pressure drops are defined on the refrigerant side at the supply and at the exhaust of the evaporator. 89

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