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49 The radial turbines are investigated for higher powers. The investigated applications produce power outputs in the range of 1β60 kW. For the whole range of power outputs, the values of specific speed ππ fall in the range 0.4β 1. Overall, the combination of Figure β2-11 and Figure β2-12can be applied as an expanderβs selection guide at the early stage of a project. Based on the application (required power output), the appropriate expansion machine can be nominated and its efficiency can be roughly known. Then, other constraints, such as size and weight, can be evaluated. For instance, PDEs are generally larger in size and heavier in weight than their turbine counterparts, which make them unfavourable in passenger vehicles. 2.3.4 Cost Estimation of Expansion Machines Expansion machines are typically the most costly component [200]β [204]becausethey need to be precision-engineered [205]. Open literature is lacking a direct cost comparison between the various types of expanders. Cost estimation, along with the plots in Figure β2-11 and Figure β2-12, can help designers decide which expander to select at the early stage of a project. GutieΜrrez-Arriaga et al. [206] presented a correlation, as expressed in equation(β2-4), to estimate the cost of ORC expanders in terms of their power outputs. The correlation is based on an exponential scaling law and was updated in 2014. However, using this correlation, the prices vary considerably as the power output changes, which cause each type of expansion machine to have a wide range of prices. Therefore, for each type, the power output is averaged and the price is estimated as depicted in Figure β2-13. πΆπ΄π = 2237 π0.41 π‘π’ππ π β2-4)PDF Image | Automotive Radial Turbine Expander Design WHR
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