Compressor Performance: lobe_blower
Centrifugal, reciprocating, and rotary screw compressor typical performance envelopes — polytropic and adiabatic efficiency, head per stage, pressure ratio, speed range, and turndown by compressor type and flow range
| compressor type | flow range | adiabatic efficiency pct (%) | flow max acfm (acfm) | flow min acfm (acfm) | head per stage ft (ft) | notes | polytropic efficiency pct (%) | pressure ratio per stage max (dimensionless) | pressure ratio per stage min (dimensionless) | speed rpm max (rpm) | speed rpm min (rpm) | turndown pct (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| lobe_blower | medium | 58 | 10,000 | 1,000 | 0 | Medium lobe blower: 1000-10000 acfm; pressure ratio typically limited to 2.0:1 for thermal protection; tri-lobe designs reduce pulsation and noise vs bi-lobe; adiabatic efficiency 55-62%; intercooled two-stage units extend to 3:1 PR; common in biogas handling and municipal water treatment aeration | 0 | 2.2 | 1.05 | 1,800 | 400 | 100 |
| lobe_blower | small | 55 | 1,000 | 10 | 0 | Roots-type lobe blower (positive displacement rotary lobe): low pressure ratio up to 2.5:1 single stage; adiabatic efficiency 50-60%; no internal compression - isentropic step at port opening; constant flow vs pressure (PD characteristic); used for pneumatic conveying and wastewater aeration; no turndown on fixed speed (on/off); VFD allows proportional flow control | 0 | 2.5 | 1.05 | 3,600 | 600 | 100 |
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