| 摘要 |
The RPM of a compressor (30) is detected by an RPM meter (45), and the sound velocity of sucked gas sucked into the compressor (30) is detected by a sound velocity meter (40). A corrected RPM calculation unit (53) finds the corrected RPM of the compressor (30) using a reference state quantity determined by the reference specific heat ratio, reference gas constant, and reference temperature of the sucked gas, the reference RPM of the compressor (30), the RPM detected by the RPM meter (45), and the sound velocity detected by the sound velocity meter (40). |
