Energy Saving Calculator
See the waste in the duty cycle, not in a hidden spreadsheet
Fixed-speed load/unload against VSD for your hours, tariff and load profile. The working is on this page. Indicative only, subject to a site survey.
Plant Duty
Pick a catalogue motor or type the kW. This is a labelled fixed-speed versus VSD comparison. It is not the AirLink blow-off story on the home page, and it is not AirLink's 20–40% network figure.
Fixed speed vs VSD
7.1% less input energy on VSD at this duty
Indicative only and subject to a site survey. Not a performance guarantee, quotation, or energy-savings warranty. Same maths the Waste Gap set-piece will use. AirLink's published 20–40% plant-network range is a different claim and is not this single-machine curve.
- Load factor
- 65% · Variable
- Annual hours
- 4992 h
- Fixed-speed kWh/year
- 202488
- VSD kWh/year
- 188074
- Annual Rand saving
- R 36036
- CO₂ avoided
- 13578 kg/year
- Indicative payback
- 5.3 years
- Motor
- 55.0 kW
Assumptions — visible, not buried
- FAD reference. ISO 1217: 1.00 bar(a), 20 °C, dry air (0% RH)
- ISO dry-air density. 1.1883 kg/m³ (R = 287.058 J/(kg·K))
- Site pressure. ICAO ISA troposphere from altitude; inlet temperature is ambient, not ISA lapse
- Humidity. Not applied. ISO FAD is dry. Highveld moisture would slightly reduce dry-air mass
- Underground default ambient. 35 °C (surface 25 °C). Altitude stays the compressor-house figure
- Headroom band. 10–25 % above the stated air requirement (no house rule; Q6)
- Fixed-speed power. Load/unload; unload draw 25 % of full-load kW
- VSD power. P/P_full = 0.1 + 0.9 × load factor
- Annual hours. hours/day × days/week × 52
- Grid CO₂. DFFE 2023 DGGEF 0.942 kg CO₂e/kWh (generation, not T&D)
- VSD premium default. R 3,500 per motor kW (catalogue has no prices)
- Framing. Indicative only and subject to a site survey. Not a performance guarantee, quotation, or energy-savings warranty.
Need a machine first? Open the selection tool.
Request a Quote With This Duty
The calculator inputs travel with the lead. Indicative only — subject to site survey.
Want This Checked On Site?
Send the duty this calculator just ran. BAOFN will confirm hours, tariff and control method before anyone treats the Rand figure as a quote.