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Engine efficiency vs. RPM of Stirling engine.
| S No | Temp Diff (°C) | Aluminum | Copper | Brass | Bronze |
|---|---|---|---|---|---|
| Max Efficiency (%) | Max Efficiency (%) | Max Efficiency (%) | Max Efficiency (%) | ||
| 1 | 20 | 0.047 | 0.072 | 0.028 | 0.017 |
| 2 | 25 | 0.07 | 0.102 | 0.041 | 0.025 |
| 3 | 30 | 0.078 | 0.115 | 0.045 | 0.026 |
| 4 | 35 | 0.09 | 0.135 | 0.05 | 0.031 |
