RDF-18 high end series are professional strong plastic structured models with axial fan, which needs to be installed with air ducting system. Fixed installation model is appropriate to be installed on solid places such as outside wall, grounds, concrete or Zinc-steel structured roof. Target Applications: Workshops, Factories, Supermarket, School&Church, Entertainment Centers.


As schematically shown, when the cooler is working, water is pumped from the tank to the water distributor, and distributed evenly to the vaporative cooling pads, then go back to the tank. Meanwhile, the outside hot air is drawn through the?wetted cooling pads and filtered and reduced in temperature before delivering to the user space.


Filtered and cooled by an evaporative air cooler, the outdoor fresh air is continuously sent into the indoor space through the air duct and air supply outlets. With the continuous supply of fresh air, the indoor space is in a positive pressure condition, thus the original hot air containing odor and dust will be emitted out of the room, resulting in a cool, ventilated, clean and comfortable environment. Suitable exhaust area and effective exhaust are essential for satisfactory performance of any evaporative air cooling system.


This zone is not applicable as in reality when the temperature is relatively high, RH is predominantly lower than the supply air temperature.With the wind-chill effect, the effective temperature for thermal human comfort is 1~2℃ lower than the Supply Air Temperature.

Amb. Temp Relative Humidity
20% 30% 40% 50% 60% 70% 80% 90%
20 12 13 14.5 15.5 16.5 17.5 18.5 19.2
25 16 17 18.5 20 21 22 23 24
30 19.5 21 22.5 24 25 25 28 28.9
35 23 25 26.5 28.5 30 30 32.5 33.7
40 25.6 28.1 30.4 32.3 33.9
45 29.2 32 34.4
50 32.7 35.8


Model Discharge Type Max Airfolw (m³/h) Voltage Hertz Phase Power Consumption (kw) Evaporative Capacity (l/h) Noise (db) Water Tank (l) Air Outlet (mm) Unit Size (mm) Net Weight (kg)
RDF-18B Bottom 18000 220~240V/50Hz/1P 380~415V/50Hz/3P 1.1 65 68 25 670*670 1100*1100*1000 60
RDF-18S SIDE 18000 220~240V/50Hz/1P 380~415V/50Hz/3P 1.1 65 68 35 670*670 1100*1100*1000 67
RDF-18T TOP 18000 220~240V/50Hz/1P 380~415V/50Hz/3P 1.1 65 68 35 730*730 1100*1100*1020 57



Evaporative Air Cooler Low investment and high efficiency.
Evaporative Air Cooler Low power consumption, only 1 KWH per hour.
Evaporative Air Cooler Increase the oxygen content in the space and improve the working efficiency.
Evaporative Air Cooler The cooling effect is strong and rapid.
Evaporative Air Cooler Wind a large amount of air distance and easy maintenance.
Evaporative Air Cooler Stable performance, reliable quality.
Evaporative Air Cooler Freely adjust air humidity.

Data for air exchange frequency in various places.

  • Air exchange frequency(times/h)=total air flow rate(m3/h) ÷ indoor space volume.
  • 20~30 times per hour for general environment;
  • 30~40 times per hour for crowded public place;
  • 40~50 times per hour for workshop with heating equipment;
  • 50~60 times per hour for workshop with high temperature and high air pollution;
  • Air exchange frequency can be increased in damp areas, and decreased in dry places.

The way to calculate the cooler quantity needed.

  • Cooler quantity needed = indoor space volume × air exchange frequency ÷ cooler air flow rate.
  • Spot cooling projects shall varies based on actual situation.
  • The ducting system shall be matched with the air cooler model, and air outlet quantity shall be considered when designing.


Cooling Equipment
Type comparison Evaporative Air Cooler comparison Air Conditioning comparison Ventilation Fan
Capacity 18000m³/h 400000 BTU/h 40000m³/h
kw 1.1 54 1.1
Workspace Area(㎡) 1000 1000 1000
Effective Height(m) 4 4 4
Air Change Per Hour 30 Recirculating 30
Electrical Energy Consumed Total Units Insalled 10 2 8
Total KW Insalled(kw) 11 108 8.8
Electrical Units Consumed @10hrs/days @26day/mth 34320 KW/YEAR 336960 KW/YEAR 27456 KW/YEAR
Cost Conparison With Reference to AC 10.1% 100% 8%
Effects Of Various Cooling Methods Pushes out hot, taste air and ventilates with Cool Clean & Fresh Air. Circulates air inside only It is ineffective in heat generating space Only moves ambient air but offers no relief as temperature rises.

Remark:Figures base on 1000㎡ wordspace area.