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Arctic Cooler


DRI Arctic Coolers also called Evaporative Coolers, Industrial Coolers, Commercial Coolers, Air Washers, Swamp Coolers and Industrial Ventilation Coolers,  offer a completely natural way of delivering refreshing cool air. DRI Arctic range of Evaporative cooling units have been specifically designed for the cooling of industrial and commercial buildings.

They are capable of lowering the fresh air dry bulb temperature by 7-12°C, e.g- the air-off temperature from the evaporative cooler for an outside temperature of 40-43°C can be as low as 28-30°C. They allow cool fresh air to be introduced throughout a building and also the stale hot air to be displaced out through openings like windows. Unlike mechanical air-conditioning which continuously cools re-circulated air, Arctic coolers introduced 100% cool fresh air into the space.

DRI Arctic Coolers use the EcoCool Evaporative Cooling Pads. EcoCool pads are highly efficient, consistent in performance over a very long life, self-supporting, highly absorbent and can be easily cleaned. They allow higher cooling  with lower air volume and are over 80% efficient.

10 Standard Models Available: 6800 CMH (4000 CFM) to 170000 CMH (100000 CFM)

Ideal for : 

Commercial Facilities like 

  • Office Complexes
  • Manufacturing Facilities
  • Workshops 
  • Commercial Complexes 
  • Restaurants 
  • Residential Buildings 
  • Shopping Malls, Banquets, Marriage Halls 
  • Textile Mills
  • Gymnasiums... and any other hot spot 

Industrial Facilities Like 

  • Poultry 
  • Green House 
  • Tea Manufacturing Units
  • Textile Processing 
  • Additional Benefits 

A reduction in temperature in the work place creates the obvious benefits of improved staff morale, increased productivity and a reduction in absenteeism: evaporative cooling can provide additional benefits :

  • An Environmentally friendly solution - evaporation is a natural process. 
  • Eliminates odors and stale air instead of re-circulating them. 
  • Money saving - running costs up to 90% less than a mechanical air conditioning system 
  • Doors and windows can remain open with no detrimental effect on the efficiency or operating cost. 
  • Provides a natural environment and improves air quality 

Evaporative Cooling Concept:

As the name implies, evaporative cooling works by evaporating water into the air stream. This principle is best illustrated in a personal way by chilling effect that you feel when you come out of a swimming pool and a breeze blows across your body!  The chilling effect is caused by the evaporation process of the water drying quickly from your body. The same thing happens when you sweat.  A “cool breeze” is just air flowing over your body evaporating the sweat.  It is nature’s way of keeping us cool during hot weather or physical exertion.

Evaporative cooling is the use of this evaporation process to cool the air passing through a wetted cooling media.  The cooling media could be as simple as a wet cloth. In fact, this process has been used for hundreds (if not thousands) of years.  Hanging a wet cloth over an open window cools the air passing through the cloth.

In technical terms, temperature is measured in two (2) important ways that relate to evaporative cooling. These are “dry bulb” and “wet bulb” temperatures expressed in degrees Fahrenheit or Celsius. There are several other measurements that reflect the amount of moisture in the air. These are “dewpoint”, “grains of moisture per pound of dry air” and “pounds of moisture per pound of dry air”, “absolute humidity” and “relative humidity”. The following brief explanation of these measurements will help in the understanding of this process.

Dry Bulb: The ambient (surrounding air) temperature taken with a thermometer .

Wet Bulb: The lowest temperature level of the air that can be reached by evaporatively cooling the air.

Wet Bulb Depression: The difference between the Dry Bulb and Wet Bulb temperatures. I.E. if Dry Bulb is 100 degrees (f) and the Wet Bulb is 70 degrees (f), the Web Bulb Depression is 30 degrees (f). The Wet Bulb Depression depends upon the efficiency of the cooling media and depth of cooling media used.

Cooling Efficiency: The percent of the temperature drop across the media compared to the Wet Bulb Depression. I.E. if the Wet Bulb Depression is 30 degrees (f) (as in the above example) and the actual temperature drop measured across the cooling media is 27 degrees (f), the cooling efficiency of the media is 90%. (27/30 = .90). The cooling efficiency is also referred to as “Saturation Efficiency” because it refers to the amount of moisture that is packed into the air. 100% Saturation Efficiency would indicate a temperature drop of 30 degrees (f) in the above example of wet bulb depression.

Dewpoint: The temperature at which moisture begins to form on a slick surface indicating 100% saturation of the air with moisture. That is how the dew gets on the grass in the morning. The dry bulb air temperature drops to the wet bulb temperature level.

Grains of moisture per pound of dry air: A method of measuring actual water vapor (moisture) in a pound of dry air, Most often referred to as “humidity ratio”. I.E. 50 grains of moisture at 100 degrees (f) equals 12% relative humidity and 70 degrees (f)  wet bulb at sea level.

Pounds of moisture per pound of dry air: Same as grains except weight of water vapor (moisture) is expressed in pounds.  In same example above, the pounds of moisture would equal .009 # per pound of dry air.

Absolute humidity: Actual measurement of water vapor in the air.

Relative humidity: The percent of moisture in the air compared to the amount of moisture the air could contain. This is the most common reading to be reported in the weather reports. The report of “100 degrees and 12% relative humidity (RH)” is the same as all the above examples. Using the analogy of a glass half filled with water means the glass is 50% full. It could hold an additional 50% at which point it would start to overflow if more water was added.

Evaporation Rate: The rate at which water is absorbed into the air passing through the cooling media. For practical purposes, this rate is measured in gallons of water per hour (or minute).

Cooling Media: The Evaporative Cooling Pad (ECP), made of cellulose paper is engineered from cross-sectional specially treated flute media capable of absorbing and retaining water to provide the maximum cooling efficiencies. The cellulose media is treated with stiffening and rot-resisting agents to increase its useful life. The geometry of the cellulose media provides cooling without any water carryover as long as the air velocity through the pads is less than the recommended maximum.

The most efficient media is EcoCool Evaporative Cooling Media. The EcoCool ECP media is treated with anti-rot and regidifying resins. The media is cross-corrugated to maximize the mixing of air & water.

Saturation effectiveness ranging from 60 to 98% can be achieved depending upon air velocity and depth of the cooling pad.

Recommended Air Changes per Hour

Application Areas Air Changes / Hours
Assembly Halls 8
Bakeries 20 
Boiler Rooms 15
Bowling Alleys 10
Dry Cleaners 12
Engine Rooms 40
Factories 25
Factories 30
Forges 12
Foundries 12
Garages 12
Generator Rooms 30
Gymnasiums 12
Kitchens 20
Laundries 12
Machine Shops 12
Mills (Paper) 20
Mills (Textiles) 10
Packing Houses 6
Recreation Rooms 10
Residences 12
Restaurants 12
Retail Stores 8
Shops (General) 8
Theaters 8
Toilets 12
Transformer Rooms 12
Turbine Rooms 10


Ventilation Rates for Acceptable Indoor Air Quality

Space Outdoor Air Required
(CFM / Person)
(People/100 sqft)
Auditoriums 15 150
Ballrooms/Discos 25 100
Bars 30 100
Beauty Shops 25 25
Classrooms 15 50
Conference Rooms 20 50
Dormitory Sleeping Rooms 15 20
Dry Cleaners 30 30
Gambling Casinos 30 120
Game Rooms 25 70
Hardware Stores 15 8
Hospital Operating Rooms 30 20
Hospital Patient Rooms 25 10
Laboratories 20 30
Libraries 15 20
Medical Procedure Rooms 15 20
Office Spaces 20 7
Pharmacies 15 20
Photo Studios 15 10
Physical Therapy 15 20
Restaurant Dining Rooms 20 70
Retail Facilities 15 20
Smoking Lounges 62 70
Sporting Spectator Areas 15 150
Supermarkets 15 8
Theaters 15 150




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