Table 6
Calculation of exergy for simplified silicon production process.
| Streams and species | Mass (kg) | Amount (mol) | Molfraction (fraction) | T °C |
P (bar) | H total (kJ) | Ex_tot_stream (kJ) | Exergy efficiency (%) |
|---|---|---|---|---|---|---|---|---|
| Input stream 1 | 0.12 | 4.00 | 1.00 | 25.00 | 1.00 | −911 | 827 | |
| SiO2 | 0.06 | 1.00 | 0.25 | 25.00 | 1.00 | −911 | ||
| C | 0.02 | 2.00 | 0.50 | 25.00 | 1.00 | 0 | ||
| O2(g) | 0.03 | 1.00 | 0.25 | 25.00 | 1.00 | 0 | ||
| Input energy stream 1 | 877 | 877 | ||||||
| Heat feed | 0.00 | 0.00 | ||||||
| Electricity feed | 0.00 | 877 | ||||||
| Output stream 1 | 0.12 | 3.00 | 1.00 | 25.00 | 1.00 | −787 | 895 | |
| CO2(g) | 0.09 | 2.00 | 0.67 | 25.00 | 1.00 | −787 | ||
| Si | 0.03 | 1.00 | 0.33 | 25.00 | 1.00 | 0 | ||
| Output energy stream 1 | 753 | 0 | ||||||
| Heat loss | 25.00 | 753 | ||||||
| Electricity out | 0 | |||||||
| Total efficiency | 0.00 | 809 | 52.5% |
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