Presets
Playback
Controls
Time scale speeds up the slow room thermal response.
Starting conditions
Changing this restarts the run.
Layers
Model checks
The science
Sensible cooling
The fan moves mass flow m = 0.17 (rpm/1600) kg/s over the coil. With an epsilon-NTU style effectiveness the supply temperature is Tout = Troom - 0.82 (1 - e-0.77 (0.17 / (m+0.025))) (Troom - Tcoil); heat removal is Q = m cp (Troom - Tout) with cp = 1006 J/(kg K).
Humidity
Water condenses on the coil when its surface is below the dew point of the room air. Humidity ratio w = 0.622 pv / (p - pv), with saturation pressure from the Magnus formula. The supply state is drawn on the straight coil-contact line from the room state toward the saturated coil state.
Room
One lumped thermal mass (75 kg of air-equivalent, 1006 J/kg/K) leaking toward 25.2 C with a 1200 s time constant.
Honest simplifications: illustrative model, not a refrigerant-circuit design tool; the compressor and outdoor unit are not modelled (electricity is a rough share); the parts are an original schematic assembly, not a specific commercial product. Time is accelerated by the slider.
What to try
- Pick Humid day: the supply point falls below the room point as water condenses and the drain pan fills.
- Dry air: the coil stays above the dew point and no condensate forms.
- Lower the fan: supply air gets colder but heat removal drops.