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2.4 Control strategy Adp V ηpp Pump efficiency Table 27: Dynamic ORC model parameters Chapter 6: Case studies Parameter V sf Mwall M ̇ nom M ̇ nom , sf Unom,l Unom,tp U nom , v Unom,sf Strategy Description Internal volume, secondary fluid Mass Nominal mass flow rate Nominal secondary fluid mass flow rate Nominal liquid heat transfer coefficient Nominal two- phase heat transfer coefficient Nominal vapor heat transfer coefficient Secondary fluid heat transfer coefficient Numerical methods Equivalent pressure drop diameter Tank Volume Pump Value 3.3 l 13 kg 0.37 kg/s 0.15 kg/s 1072 W/m2K 3323 W/m2K 1359 W/m2K 3855 W/m2K Max der, average _Tcell 3.07 cm2 15 l Parameter V sf Mwal M ̇ nom M ̇ nom , sf Unom,l Unom,tp Unom,v Unom,sf Strategy Adp type V s Description Internal volume, secondary fluid Mass Nominal mass flow rate Nominal secondary fluid mass flow rate Nominal liquid heat transfer coefficient Nominal two- phase heat transfer coefficient Nominal vapor heat transfer coefficient Secondary fluid heat transfer coefficient Numerical methods Equivalent pressure drop diameter Expander Selected polynomial Swept volume Value 9.56 l 30 kg 0.37 kg/s 2 kg/s 425 W/m2K 1453 W/m2K 477 W/m2K 5199 W/m2K Max der, average_ Tcell 5.6 cm2 Open- drive 1.1e-4 m3 0.7 The goal of this work is to define a control strategy for a small-scale ORC working with a heat source that varies in terms of temperature and mass flow. The first step is to optimize the working conditions of the cycle for a given static heat source. This is done according to the recommendations of section 5.2 : the subcooling and the superheating are reduced to a minimum, and the 22PDF Image | Organic Rankine Cycles for Waste Heat Recovery and Solar Uses
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