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• Modelling based on turbine characteristics expressed as a function of the pressure number. • Modelling based on turbine characteristics expressed in terms of isentropic efficiency as a function of the ratio of blade velocity to flow velocity. The first method uses the mechanical and isentropic efficiency of the turbine at the design point together with the properties of the working fluid to estimate the power output of the turbine. The last three methods require the performance characteristics of the turbine to be obtained through experimental set-up. The last three methods are very useful in determining the off-design performance of the turbine as well as in estimating the turbine efficiency at partial load condition. In this research, the first method has been adopted. Although it is not the most appropriate considering the fact that the system will not operate only at full load condition, however, it has been adopted because of some constraints encountered during the course of this research work which mainly arise as a result of the unwillingness on the part of ORC turbine manufacturers to give out information on the performance characteristics of their ORC turbines for reasons of confidentiality. In order to overcome this constraint, some turbine efficiency data published in the literature were used (Turboden, 2011, Drbal et al., 1996, Aneke et al., 2011b). Based on the above constraints, the turbine has been modelled using isentropic and mechanical efficiency data of an R245fa ORC turbine developed by United Technologies Corporation which was used to build the 113PDF Image | OPTIMISING THERMAL ENERGY RECOVERY
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