24 May 2014

Providing a green alternative to airconditioning

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What are the savings?

An evaporative cooling installation typically consumes less than 10% of the electricity compared to the equivalent rated refrigeration based cooling system.

What is direct evaporative cooling and how does it work?

Evaporative cooling is a very simple method of cooling air without using refrigerants. A direct evaporative cooler, using wetted filter pads, cools air by bringing it into contact with water. Water evaporates into the air stream and cools it. The amount of cooling is dependent upon the temperature and relative humidity of the air. 

Principle of Evaporative Cooling

Cooling is provide by evaporative heat exchange which takes advantage of the principles of the latent heat of evaporation where tremendous heat is exchanged when water evaporates. It makes use of the free latent energy in the atmosphere. Compared to air-conditioning which uses mechanical refrigeration, the operating cost of evaporative heat exchange is 90% less than air conditioning.

Mechanics of the Unit

Water is brought into the cooler from the mains water supply and is pumped up to the top of the unit using a circulation pump. The water is then dispersed over the  pads using a water distribution system which allows the water to flow continually over the pads.

celdek pads

The pads become saturated, air is drawn through and the water evaporates causing the air to cool. The cool air is then ducted round the building to provide cooling by means of an axial fan.

Services Requirement

An evaporative cooler requires mains water and 240v electricity supply.

Temperatures Achievable

The hotter the outside temperature and the lower the humidity, the greater will be the cooling effect. On the hottest day up to 15°C of cooling can be achieved through this process. The air off temperature of an Coolair Australia’s Cooloer  is always below 26°C, thus providing excellent comfort cooling for most building requirements.

Humidity

With an evaporative cooler you are basically turning a hot summer day into an April day. If the building does not suffer from a humidity problem in April it will not suffer from one in the summer. Humidistats can be fitted if humidity is critical To achieve the control of humidity, Coolair Australia’s Coolers employ state of the art central controls:

aircooler controls for humidity

air cooler controls for humidity

When to use Evaporative Cooling

Ventilation systems can provide comfort cooling for most of the year. During prolonged periods of high temperatures they are unable to maintain internal temperatures below 25°C. It is at this point that evaporative cooling is brought in. Using evaporative cooling as an integral part of a balanced ventilation system means that the temperature of a building can be controlled even on the very hottest days.

Why is it cheaper to run than Air Conditioning?

The economics of using evaporative cooling are surprising to most people. An 90% reduction in energy used compared to a conventional air conditioning unit seems too good to be true.

 Why do we need to run an air conditioning system when the temperature outside is 35°C ? In a modern, well insulated and air tight building with even a light occupancy the air conditioning is running almost continuously. By simply bringing in ambient air this will keep a building cool most of the year. By using a control system to minimise energy usage of fans coupled with evaporative cooling, relatively low flow rates of air are required. The only significant energy use is in the fan for the air movement. Typically a 1kW evaporative cooling system can manage a 20kW load.

Evaporative Cooling Installation Methods

 

EXTERNAL INSTALLATION – DOWN DISCHARGE

The majority of coolers are installed in this way. The extract would typically be 80% of the total cooler capacity.

down discharge evaporative cooler, air cooling from ecocooling  down discharge evaporative cooler, air cooling from ecocooling down discharge evaporative cooler, air cooling from ecocooling

INTERNAL INSTALLATION – DOWN DISCHARGE

 advantages of an internal suspended evaporative cooler

Where ventilation exists an internal unit can be suspended from the building structure. Air can then be directed for spot cooling or diffused as part of a larger scheme.

The hot, dry air is taken in and cooled air is distributed exactly where it is required. The stainless steel plenum chamber allows great flexibility in setting the direction of the air flow.

 

CoolairAustralia’s Engineers have supplied and installed more Evaporative cooling systems in restaurants, hotels, warehouses, schools,and Stadiums than any other company in the World. Providing a Green cooling alternative to air conditioning. Air coolers is the ideal way to cool your commercial or home place and save thousands of pounds on installation costs, annual running costs and also thousands of tonnes of Carbon emissions per annul. Environmentally friendly, low energy cooling at its best.

 

 

 

 

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