study of ORC with the expansion process twin screw machines

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study of ORC with the expansion process twin screw machines ( study-orc-with-expansion-process-twin-screw-machines )

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Figure 46 Power absorbed and rejected in the simulated ORC case 5.1 Understanding the behaviour of an operating ORC Below is the summarisation of how specific parameters of the cycle can be adjusted by varying certain conditions as addressed by Quoilin [68].  Total heat transfer across the evaporator is determined by the evaporator configuration and by the temperature and flow rate of the waste heat source.  Refrigerant mass flow rate can be adjusted by modifying the swept volume of the pump or varying the rotational speed.  Expander supply pressure is imposed by the expander rotating speed for a given pump flow rate. Reducing the expander rotating speed leads to a higher evaporating pressure.  Condenser supply temperature is imposed by the expander efficiency, the ambient losses of the expander and coolant conditions.  Adding more fluid to the circuit increases the amount of liquid, and increases the level of liquid in the heat exchangers. If the evaporating conditions are fixed, the liquid level in the evaporator remains more or less the same because the fluid needs a fixed heat exchanger area in order to become evaporated or superheated. Increasing the refrigerant charge will increase the liquid level in the condenser and increase the subcooling zone in the heat 84

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