Two tools: one showing what the heat you throw away is worth, and one that sizes the system. Both give indicative figures — final dimensioning is done with an HVAC consultant.
Lynx energy calculator
How much heat does your kitchen throw away today?
3,600 m³/h
Kitchen type
Heat you throw away today
63,575kWh/yr
Recovered output: 15.4 kW · net of the fan penalty for Lynx and the heat exchanger
0.20 €/kWh
Worth
12,700€/yr
CO₂ saved: 15.9 tonnes/yr
Assumptions
Efficiency 85% (high-efficiency rotary heat exchangers recover up to 90%).
4,320 operating hours per year (12 hours a day, 360 days).
Temperature rise by kitchen type: light 10 K, medium 15 K, heavy 20 K.
A fan penalty for 330 Pa pressure drop (Lynx 180 Pa + heat exchanger 150 Pa) has been deducted.
CO₂ factor: 0.04 kg/kWh Nordic electricity mix (NOK/SEK), 0.25 kg/kWh European average (EUR).
Sensible heat only. Latent heat in steam comes on top and is not included.
The calculation assumes a high-efficiency heat exchanger is installed. Lynx makes recovery possible by keeping the duct free of grease. The cost of the heat exchanger comes on top and depends on the installation.