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Research Article

Experimental investigation of an Organic Rankine cycle system using an oil-free scroll expander for low grade heat recovery

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Pages 812-821 | Received 21 Sep 2020, Accepted 17 Dec 2020, Published online: 04 Mar 2021

Figures & data

Figure 1. (a) Schematic diagram of the ORC system. (b) The photo of the ORC prototype

Figure 1. (a) Schematic diagram of the ORC system. (b) The photo of the ORC prototype

Table 1. Specifications of main components and test equipment

Figure 2. Variation of mass flow rate with circulation pump frequency

Figure 2. Variation of mass flow rate with circulation pump frequency

Figure 3. Variation of temperature and superheat degree at the expander inlet with circulation pump frequency

Figure 3. Variation of temperature and superheat degree at the expander inlet with circulation pump frequency

Figure 4. Variation of the pressures at the expander inlet and outlet with mass flow rate

Figure 4. Variation of the pressures at the expander inlet and outlet with mass flow rate

Figure 5. Variation of the expander rotation speed with mass flow rate

Figure 5. Variation of the expander rotation speed with mass flow rate

Figure 6. Variation of the power output and net power output with the mass flow rate

Figure 6. Variation of the power output and net power output with the mass flow rate

Figure 7. Voltage and current output from the generator under different loads

Figure 7. Voltage and current output from the generator under different loads

Figure 8. Variations of pressure ratio and the volumetric ratio with mass flow rate when it is superheated

Figure 8. Variations of pressure ratio and the volumetric ratio with mass flow rate when it is superheated

Figure 9. Overall efficiency of the expander-generator unit under superheated conditions

Figure 9. Overall efficiency of the expander-generator unit under superheated conditions

Figure 10. Thermal efficiency of the ORC under different pressure ratios with different loads

Figure 10. Thermal efficiency of the ORC under different pressure ratios with different loads

Figure 11. Variation of power output and net power output

Figure 11. Variation of power output and net power output

Figure 12. Effect of pressure ratio on the overall efficiency of expander-generator unit

Figure 12. Effect of pressure ratio on the overall efficiency of expander-generator unit

Figure 13. Effect of the pressure ratio on the thermal efficiency

Figure 13. Effect of the pressure ratio on the thermal efficiency

Figure 14. Effect of condensation temperature on the net power output and thermal efficiency

Figure 14. Effect of condensation temperature on the net power output and thermal efficiency

Figure 15. Effect of condensation temperature on the overall efficiency of the expander-generator unit and pressure ratio

Figure 15. Effect of condensation temperature on the overall efficiency of the expander-generator unit and pressure ratio