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Figure 1. Illustration of Supercritical Carbon Dioxide (SCO2) cycle on Mollier diagram. The SCO2 cycle starts at a low side pressure above 7.5 MPa and a low side temperature of 35 °C, slightly above the critical point. After compression the SCO2 is brought to the high-side pressure of 20 MPa and a temperature of 36 °C, approximately 1 °C higher than the pre-compressed state. An internal heat exchanger then heats the pressurized SCO2 by exchange with low- pressure, post-expansion SCO2. After exiting the internal heat exchanger the SCO2 is heated in a second heat exchanger where addition is done via waste heat, raising the temperature to its ultimate value of approximately 200 °C. The heated and pressurized SCO2 is then expanded near isentropically to produce rotational energy. The rotational energy is converted to electricity by coupling the expander’s output shaft to a permanent magnet alternator. The fluid exits at a low- side pressure of 12.4 MPa and a temperature of 163 °C. The expanded fluid is then run through the internal heat exchanger where it is cooled by high-pressure, pre expansion SCO2. The cooled supercritical CO2 is finally passed through a radiator where it exits at the pre- compressed pressure and temperature. The following steady-state, steady-flow thermodynamic relations given in Eqn. (1) through Eqn. (9) relate the hardware components of Figure 1 to the various operating points labeled on the p-h Mollier state diagram of the SCO2 working fluid as shown in Figure 1. Compressor: h2,sh1 (1) chh 21 W m h h (2) c 2 1 Expander: W e m h 4 h 5 (4) 3 hh 45 ehh (3) 4 4,s Waste Heat: Q m h h (5) in 4 3 Condenser: Q mhh (6) out 6 1 Specific Work Output:PDF Image | Waste Heat Energy Supercritical Carbon Dioxide Recovery Cycle Analysis and Design
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