In certified Passive House structures governed by extreme envelope airtightness (n50 ≤ 0.6 h⁻¹), conventional ducted kitchen range hoods are physically untenable. A standard ducted range hood exhausts 600 to 1,000 m³/h of conditioned interior air directly outdoors. In a hermetically sealed home, this massive exhaust creates dangerous negative depressurization (-50 to -100 Pa) within minutes, backdrafting toxic flue gases from fireplaces and blowing open envelope seals while puncturing a permanent hole in the thermal envelope. The high-performance Passive House solution relies upon closed-loop, advanced Cold Plasma Recirculation range hoods decoupled from the central MVHR system. SerVilla installs zero-energy-loss kitchen extraction systems engineered for pristine indoor air quality.
1. Enclosure Depressurization Mechanics & Thermal Penalty
In an airtight envelope, internal negative pressure (Δ P) driven by mechanical exhaust is expressed via the orifice equation:
Where C is flow coefficient and n ≈ 0.65 the flow exponent. In a 200 m² home compliant with n50 = 0.4 h⁻¹, an 800 m³/h kitchen exhaust induces over 80 Pa of vacuum. Doors become difficult to open, and replacing this air with freezing exterior air requires up to 8 kW of instantaneous space heating.
2. Cold Plasma Oxidation & Molecular Scent Decomposition
Standard activated carbon filters saturate within months, releasing pungent cooking odors back into open-plan living areas. SerVilla integrates Cold Plasma Dielectric Barrier Discharge (DBD) reactors:
- Mechanical Grease Centrifugation: Stainless steel multi-stage baffle filters extract 98% of airborne cooking grease aerosols.
- Cold Plasma Ionization: Gaseous odor molecules pass across a high-voltage, micro-amperage plasma field. Oxygen molecules are split into ozone (O3) and hydroxyl free radicals (OH^-), initiating rapid cold combustion that oxidizes complex cooking hydrocarbons, amines, and sulfur compounds into benign water vapor (H2O) and carbon dioxide (CO2).
- Catalytic Carbon Regeneration: Downstream carbon blocks scrub residual traces of ozone and continuously self-cleanse, extending maintenance-free lifespans to 5-10 years.
| Kitchen Extraction System | Envelope Airtightness (n50) | Odor Destruction Efficiency | Annual Space Heat Loss | Operational Safety & Reliability |
|---|---|---|---|---|
| Conventional Ducted Outdoor Hood | Violates airtightness envelope | 100% (Transferred outdoors) | 400 – 700 kWh/year thermal penalty | Backdraft vacuum hazard; grease fires in duct |
| Basic Charcoal Recirculating Hood | Envelope safe | 45% – 55% (Rapid saturation) | 0 kWh | Lingering frying odors; frequent filter expense |
| SerVilla Cold Plasma Closed-Loop | 100% Airtightness compliant | 95% – 98% (Molecular ionization) | 0 kWh (Enthalpy retained) | Absolute zero fire risk; 5+ year filter cycle |
| Make-Up Air Interlocked Damper | Requires motorized fresh air vent | 100% | 350 – 500 kWh (Tempering incoming air) | High mechanical complexity; sensor failure points |
3. Kitchen Moisture Extraction via Smart MVHR Interlock
While plasma technology destroys odor molecules, culinary steam must be moderated. SerVilla positions an MVHR extract terminal equipped with an autonomous relative humidity sensor within the kitchen ceiling envelope, spaced 2 meters away from the cooktop. The moment cooking steam elevates localized humidity above 60% RH, the MVHR air handler ramps into boost ventilation mode, recovering latent enthalpy through its counter-flow heat exchanger without unbalancing building pressure.
