1 - The Question Every Buyer Asks First
Two instruments. Same room.
One conflicting answer.
A thermometer and a human body disagree about the same room. Both are right.
Instrument 01
🌡️ Mercury thermometer, fixed position
34°C
Reading is identical before and 30 minutes after the HVLS fan starts
✗ No temperature change detected
Instrument 02
🧍 Human body, same position, same air
~27°C
Perceived temperature once the fan reaches 0.7 m/s airspeed
✓ 7°C comfort shift, fully measurable
VS
2 - The Explanation
Why Your Body
Disagrees With the Thermometer
A thermometer and a human body disagree about the same room. Both are right.
Comfort isn't about air temperature — it's about how fast your body sheds heat. Sweat is supposed to evaporate and carry heat away. Still air stops that. The humid layer next to your skin saturates in seconds, and evaporation stalls.
HVLS airflow sweeps that layer away. Sweat evaporates again, heat leaves 3–4× faster, and your body reads that as cooler — even though the air itself never changed.
Not a marketing claim
ASHRAE 55 §5.3.4 (Elevated Air Speed) formalises this exact effect via the PMV comfort index — the same physics used to certify office buildings, applied at industrial scale.
3 - The Mechanism, Visualised
Four Stages, Left to Right
From sweat to perceived cooling — no refrigeration involved.
Stage 1
💧
Sweat appears on skin
Body's natural response to heat or exertion. Ready to evaporate and carry heat away.
Stage 2
🚫
Still air traps moisture
Humid boundary layer saturates within seconds. Evaporation stalls. Heat stays put.
Stage 4 ★
📉
Heat loss accelerates
Evaporation resumes at full rate. Perceived temperature drops 4–8°C. Air temp: unchanged.
Stage 3
💨
HVLS sweeps it away
0.5–0.9 m/s airflow continuously replaces the boundary layer with drier air.
4 - By the Numbers
More Airspeed, Bigger Perceived Drop — Up to a Point
34°C, 70% RH, light activity. Gains taper as comfort is reached.
0.1 m/s
0°C
Still air — feels like 34°C
0.3 m/s
-3°C
Threshold — feels like 31°C
0.7 m/s ★
−7°C
HVLS optimal — feels like 27°C
1.0 m/s
−9°C
Upper comfort — feels like 25°C
5 - The Honest Exceptions
When Airflow Genuinely Isn't Enough
Six cases where airflow alone isn't enough.
🧊Cold storage & food
Needs sub-ambient temps — only refrigeration does that.
💊Precision manufacturing
Pharma, electronics need ±1–2°C control — AC's job, not airflow's.
🖥️Server rooms
Hardware needs real ambient control, not perceived comfort.
💧Active dehumidification
Hardware needs real ambient control, not perceived comfort.
🏥Cleanroom certified
ISO 14644 / GMP requires engineered AC and filtration.
🌡️Extreme heat (40°C+)
Airflow alone may not reach comfortable PMV past this point.
CFD Airflow Simulation
Real-time airflow visualisation · RK2 advection algorithm · Configurable via Website Builder
Simulation is illustrative only. Actual airflow depends on space geometry, obstructions and HVAC interaction. Contact Hamilton Air for a site-specific CFD report.
Hamilton Air HVLS Fan Line
Industrial Ceiling Fans HERO Series
Hamilton Air branded HVLS line – gearless PMSM motor, aerodynamic aluminium blades, IP55 to IP68 protection. Coverage from 600 m² to 2,000 m² per fan.
HERO-5 V300i
Standard range – ideal for light manufacturing workshops, showrooms, supermarkets, sports halls. Gearless PMSM motor, VFD control, minimum ceiling height 3.5m.
View Details →HERO-5 V200i
Compact version – optimised for mid-size warehouses, workshops, schools. Minimum ceiling height 3.0m, lightweight, easy installation.
View Details →HERO-6 V380e
Latest generation – 3-phase 380V PMSM motor, IP65 dust and pressure water protection. Optional IoT connectivity, app control. Ideal for logistics warehouses and manufacturing plants.
View Details →HERO-6 ADF
ADF (Advanced Distributed Fan) technology – uniform airflow distribution, hot spot reduction. Optimised for shopping centres and mixed-use workshops.
View Details →HERO-6 X Series
IP65/IP68 rated – unique on the Vietnam market. Stable operation under direct washdown: food factories, aquaculture, seafood processing.
View Details →HERO-8 ADF
Flagship – 8-blade ADF up to 7.3m diameter. Maximum airflow for mega logistics warehouses, airports, exhibition centres and large sports arenas.
View Details →Bắt đầu viết ở đây...
