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Pressure drop of working fluid in pre-heater & evaporator assumed to be between 0.2 and 0.6 bar Pressure drop of working fluid in condenser was assumed to be between 0.1 and 0.4 bar The cooling water temperature rise in the condenser was assumed to be 10°C The pinch point temperature difference for all the heat exchangers was assumed to be 5°C Changes in the kinetic and potential energy of the internal and external fluid streams are negligible Heat losses in the heat exchangers are neglected. Hence, the rate of heat transfer to the working fluid is equal to that extracted from the heat source Pressure drops and component efficiencies provided by the manufacturer are treated as typical and were kept constant for all optimization cases. Preheater: the working fluid leaves the preheater as saturated liquid (x = 0) Evaporator: the working fluid leaves the evaporator as saturated vapour (x=1) when considering superheated case. Condenser: working fluid exits the condenser as saturated liquid (x = 0) 3.5 Global model Identification of the parameters The model contains 3 types of parameters: Known parameters: These parameters are given by the manufacturer or available in literature (This is the case for the expander efficiency). Calculable parameters: These parameters can be evaluated (This is the case for the heat transferred in the boiler). Calculation dependent parameters: The known parameters values are fixed and the calculable parameters are found. The calculation dependent parameters are then predicted from these values. (This is the case for the expander inlet dryness). 47PDF Image | study of ORC with the expansion process twin screw machines
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