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e ACCEPTED MANUSCRIPT Qe = m(h1 ‒ h7) output from the turbine is given by: Wt = m(h1 ‒ h2is)ηt1 + m(h2 ‒ h3is)ηt2 The delivered net power output from the system is determined using following equation: Wnet = Wtηmechηgen ‒ Wp ηgen and ηmech are the generator and mechanical efficiencies respectively. The thermal efficiency of ORC system is determined by: Wnet ηth= Q (1)The power (2) (3)where the (4) The ORC system second law efficiency is the ratio of the actual ORC thermal efficiency to the ideal system efficiency i.e. Carnot cycle efficiency which is obtained using the following equation: ηth Wnet = T (5) ηsec eff = η Carnot Qe(1‒ L) TH The details of input parameters in terms of heat and sink sources’ temperatures (i.e. hot side temperature and cold side temperature) for the ORC’s system modelling and turbines design is outlined in Table 2 with different ranges of mass flow rate (0.1-0.5 kg/s). The design input parameters of the ORC’s system modelling and turbine design are detailed in Table 2. The design parameter values are stated in terms of heat source temperature and heat sink temperature (cold side temperature) with three organic working fluids for various ranges of mass flow rates within 0.1-0.5 kg/s. Where the working fluid mass flow rate is used as an input parameter to calculate the desired power output, thus the ORC system and the turbine design can be sized to achieve this specification. Table 2 Input parameters used in the ORC modelling. Parameters Values/Ranges Unit Temperature of heat source Temperature of heat sink Recuperator effectiveness Pump efficiency Mechanical efficiency Generator efficiency Mass flow rate of working fluids Working fluids 365 K 293 K 80% - 75% - 96% - 96% - 0.1-0.5 kg/s R141b, R245fa and isopentane - 7PDF Image | turbine configuration for low-power organic Rankine cycle
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