HvacSim

Semi-CFD HVAC airflow — U-shaped room, ceiling diffusers.

Room

Leg A length 6000 mm

Leg B length 6000 mm

Connector 3000 mm

Corridor width 3500 mm

Ceiling height 2700 mm

Corner chamfer 300 mm

Diffusers

Center · pattern

Center · offset 0 mm

Center · flow 0.12 m³/s

Leg A · pattern

Leg A · offset 0 mm

Leg A · flow 0.1 m³/s

Leg B · pattern

Leg B · offset 0 mm

Leg B · flow 0.1 m³/s

Calculation

Standard default · responsive Accurate finer grid · slower

Display

Pattern data raw throw patterns, room ignored Raw patterns superposed in the room, pre-solver Simulated reconciled airflow

Iso-surface speed 0.2 m/s

Iso-temperature 24 °C

Streamlines 100

Streamline scale 0.2 m/s Half-opacity speed; lower to reveal slower flow.

Show layers Streamlines Iso-velocity surface Iso-temperature surface Draught-risk surface DR floor heat-map Draught hotspots Occupied zone

Clip to occupied zone

Comfort category Category A strict · DR ≤ 10% Category B standard · DR ≤ 20% Category C lenient · DR ≤ 30%

Legend

Green surface — air at or above the iso-surface speed set by the slider; 0.2 m/s is the ISO 7730 draught threshold.

Amber surface — air at or above the iso-temperature threshold; shows how far the warm supply has reached.

Red surface — the draught-risk surface: air whose ISO 7730 Draught Rate exceeds the comfort category's limit.

Floor heat-map — ankle-level Draught Rate across the occupied zone (green calm → red draughty).

Draught hotspots — the worst draught-rate points where people are.

Streamlines — colour shows air temperature (blue cool → red warm), opacity shows speed (faint = slow). Room range: —.

Diffusers — ceiling supply-air inlets.

Exits — under-door return openings.

Occupied zone — the ISO 7730 region (floor to head height, inset from the walls) where the draught-rate verdict is assessed.

waiting for first simulation…