Evaporative Coolers

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Evaporative Systems - Solution against Australia's harsh weather.

With Australia's hot summers and high energy cost, evaporative systems are a cost effective cooling option that will keep your house cool and waste less energy. Evaporative Systems work by channelling air from the outside through its system and releasing it to provide you with cool "fresh air".

Evaporative coolers have become a common system choice among many Australians today due to their ability to provide cooling for the entire house while helping you save on electricity and installation costs.

This system is ideal for hot and dry conditions such as in the southern areas of Australia as the cooling effect of an evaporative system relies on evaporating moisture from the wet filter pad. They are not as suitable for humid conditions as this limits the cooling effect – the water will not evaporate as easily from the pads in humid weather.

Why is Evaporative Cooling Ideal for Your Home?

There are many reasons why evaporative cooling is ideal for your home:

• No need to keep doors and windows shut. Keep them open and be ensured of fresh and healthy air.
• It won’t dry out your skin, nose and eyes.
• It is more energy efficient which means better for the environment.
• It is based on a totally natural cooling process without any harmful refrigerant gases unlike refrigerated air conditioning.

What is Evaporative Cooling and How Does it Work?

Evaporative cooling uses water as a cooling agent to lower the temperature of an area. Starting from the reservoir, a pump is used to circulate water onto a cooling pad which subsequently becomes very wet. When that happens, air from outside the unit is drawn through the moistened pad and successively cools the air by evaporation.

To ensure that evaporative cooling works at an optimum level, the cooling pads must be really saturated throughout the operation and the systems fan and motor are designed properly to deliver the right amount of air into the home. The temperature lowers when the water is evaporated and energy is lost from the air.

There are two important temperatures to consider when it comes to evaporative cooling:

• Dry Bulb Temperature – the air temperature measured by a regular thermometer exposed to the air stream.
• Wet Bulb Temperature - the lowest temperature which can be reached by the evaporation of water only.

Humidity is an important consideration when it comes to evaporation. When the humidity level is below 100%, evaporation starts to take place and the air begins to absorb water. Air can retain up to a certain amount of water vapour and the level of absorption depends on the amount it is already retaining.

We need energy to convert liquid to vapour and we get this energy through an adiabatic process from the air itself. How this works is that air going into the evaporative cooler gives up heat energy to evaporate water. While this process is going on, the dry bulb temperature of the air passing through the cooler is reduced.