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ORC-System Model Description (2/2) ORC model is developed under AMESim® environment; Working fluid. The Helmholtz EoS is adopted to describe the real gas effects of R245fa. Heat Exchangers. o An iterative sub‐heat exchanger modeling approach is ORC system reference data used; o 2D discretization model: a counter flow straight pipe Ambient conditions Solar collector hot reservoir Temperature: 20 °C Pressure: 1 bar Irradiation: 800 -1000 kW/m2 Hot fluid: water divided into nx longitudinal lumped volumes of length Δx; o Proper heat exchange correlation during single phase Cold reservoir Expander Workingfluid Evaporator PHE Maximum temperature: 90 °C Flow rate: 0.05 – 0.5 kg/s Temperature: 20 °C Flow rate: 0.2 kg/s Automotive scroll compressor Swept volume: 85.7 cm3/rev Isentropic efficiency: 0.65 Built-in compression ratio: 3 HFC-245fa and two‐phase (i.e. evaporation and condensation). Expander. Scroll‐expander model based on Lemort et al. separating effect assumptions. o Inlet and exhaust pressure drops. o Use of volumetric, isentropic and mechanical Nominal flow rate: 0.05 kg/s Heat exchange area: 7.2 m2 efficiencies to characterize the performance of the scroll Number of plates: 100 Plate thickness: 0.4 mm Plate material: AISI 316 Heat exchange area: 5 m2 Number of plates: 70 Plate thickness: 0.4 mm Plate material: AISI 316 Nominal rotational speed: 1000 rpm Efficiency: 0.9 expander. o Internal pressure drop due to small path between fixed and orbiting scroll; o Thermal conduction with internal wall of scroll; o Heat exchange with environment; o Leakage flow to take into account all internal leakages; o Adoption of the equation of mass balance to check Condenser PHE Electric Generator whether each component works correctly. Lemort, V., Quoilin, S., Cuevas, C., Lebrun, J., 2009, “Testing and modeling a scroll expander integrated into an Organic Rankine Cycle”, Applied Thermal Engineering, 2009(29), 3094 – 3102.PDF Image | Application of Micro CHP ORC Heat Recovery
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