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Evaporative Cooling Systems

How Evaporative Cooling Works

Evaporative cooling pads

Evaporative cooling works because as warm air passes through a series of wet filter pads, the water in the pads evaporates, therefore cooling the air passing through them. No refrigerants are required, with their complex, energy intensive compression systems, in the production of cold air used in evaporative cooling. This is why these systems run at 10% of the power of air-con units.


Green Energy offers a range of different units with different installation options, which you can access from our products pages. These include:

Top, side and downwards discharge units;

A variety of externally fixed systems installation options;

Server room and Datacentre cooling options;

Internally fixed systems;

Mobile units;

Air-distribution products.


Evaporative Cooling compared with Air-Conditioning

Evaporative Air Cooling Refrigerated Air Conditioning
Uses 10% of the electricity required by conventional air conditioning High electrical use due to refrigerant circuit compressor
No refrigerants Uses environmentally damaging refrigerants
Supplies 100% fresh, outside air and cools it Produces recycled internal air that is cool
Low Carbon Dioxide footprint High Carbon Dioxide footprint
Simple engineering, easier and cheaper to maintain Complex engineering, hard and expensive to maintain
Low purchase cost High purchase cost
Performance improves at high temperatures Performance reduces at high temperatures
Open windows and doors provide effective evacuation of air Must not leave Windows & Doors open

What sizing & installation considerations do I need to make?

Airflow considerations with your cooler

We employ several methods to determine how many coolers are required using proven airflow and cooling design tools.


One method, the "Air Changes" approach, calculates the volume of the building and applies a multiplier based on the type of building it is and the consequent requirements for air-flow. An office or shop, for example might only require 8 - 10 total-volume air-changes per hour, whereas a bakery, or a forge, would require between 30 - 40.


Structured airflow around your workplace

A further method, the "Energy Balance" method, relies on the present cooling load on a building to be known. If it is, then the mass flow rate of the air at a given temperature can be calculated. An allowance can be made for "layering" in taller buildings.

One final method is the "Spot Cooling" calculation where the air changes per hour can be calculated as a function of distance the cooling effect is required from the cooling source.

All these calculations are available to our installers and consultants.


What can you do now?

If you wish to find out more about:

then please contact Green energy (Eu). We would be delighted to tell you more. We are also looking for distributors to help promote these products and install them in your own local area. For more information, please contact us here!