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Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery

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Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery ( study-working-fluid-selection-organic-rankine-cycle-orc-engi )

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3410 E.H. Wang et al. / Energy 36 (2011) 3406e3418 materials. Nine pure organic working fluids were selected; the Tes diagrams are plotted together in Fig. 5. Wet working fluids such as water were not included because of their large latent heat vapor- ization properties, which are not appropriate for waste heat-recovery applications. The physical and chemical properties of the selected working fluids and their impacts on the environment are listed in Table 1. Considering the operational status of an ORC system assembled on the vehicle and the design parameters of the single screw expander, the constraining conditions of the model are listed as follows: (1) The working fluids were selected as pure fluids whose boiling points are greater than 270 K. (2) The heat quantity provided by the exhaust gas was sufficient to meet the ORC operation. (3) The condensing temperature ranged from 300 K to 360 K. (4) The evaporating pressure ranged from 0.2 MPa to 2 MPa. (5) The reference temperature was set to 273 K. (6) The high temperature heat source of ORC was set to 600 K and the low-temperature heat source was set to 300 K. (7) The net power out from the ORC was set to 10 kW. (The value of 10 kW is specified for experimental study. In fact, the rated power of ORC should be decided according to the practical configurations of vehicle engine. A relevant analysis can be (8) The pressure ration of the screw expander was limited to 8. (9) The maximum volumetric flow of the working fluid at the outlet of the expander was 20 L/s. (10) The efficiency of the pump was set to 0.8. Fig. 8. Contour maps of the thermal efficiency for A type. referenced in [29].) Fig. 9. System exergy destruction rate comparison for A type.

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