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Heat Recovery Ventilator — Counterflow Exchanger

Interactive 3D counterflow heat-recovery ventilator (MVHR/HRV): watch incoming and outgoing air streams exchange sensible heat across a Passivhaus-style core, and tune outdoor temperature, exchanger effectiveness and airflow to see the recovered heat, energy saved and frost risk in real time.

Energy & Thermodynamics3DModerate60 FPS📱 Mobile-adapted⇄ 2D version

Mechanical ventilation with heat recovery (MVHR) is the piece of hardware that lets a Passivhaus or nZEB building swap its entire indoor air volume for fresh outdoor air continuously without paying to reheat it from scratch. This simulator renders the exchanger core as two counterflowing streams of air parcels — cold fresh air heading in, warm stale air heading out — that visibly warm and cool as they cross the core, driven by the same effectiveness equation real HRV units are rated on. Dial in the outdoor temperature, indoor setpoint, core effectiveness and airflow rate to watch the supply and exhaust temperatures, recovered heat in watts and percentage energy saved update live, and try pushing effectiveness and cold weather together to trigger the frost-protection warning real units are designed around.

⚙ Under the hood

Watch a Passivhaus-style counterflow heat-recovery ventilator exchange heat between incoming fresh air and outgoing stale air in real time, and tune outdoor temperature, core effectiveness and airflow to see recovered heat, energy saved and frost risk.

heat recoveryventilationpassivhaushvacenergy efficiencythermodynamics

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install