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Evaporative Cooling Systems

Efficient environmentally friendly cooling

Whether you work in an office, warehouse, factory, shop or showroom most places of work require cooling in summer months. Until now the only cooling solution has been refrigerant based air conditioning and this has been restricted to high yielding accommodation such as shops or offices. Furthermore recent energy price increases have put energy efficiency at the top of everyone's "to do" list & have raised questions about the sustainability of traditional air conditioning.

Principle of Evaporative Cooling

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

Mechanics of 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 wetted pads using a water distribution system which allows the water to flow continually over the pad. The pads become saturated, air is drawn through the pads 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.

Temperatures Achievable

The hotter the outside temperature and the lower the humidity, the greater will be the cooling effect. On the hottest day in the UK up to 15°C of cooling can be achieved through this process. The air off temperature of an evaporative cooler in the UK is always below 23°C, thus providing excellent comfort cooling for most building requirements. In the UK during a typical hot period the ambient temperature approaches 30°C. This coincides with a Relative Humidity of under 50%. As the air passes over the pads it will typically cool down to about 22°C. There is less cooling in the night as the temperatures reduce and the humidity rises.

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 in the summer. Humidistats can be fitted if humidity is critical.

The Economics

The economics of using evaporative cooling are surprising to people. An 85% reduction in energy used compared to a air con unit seems too good to be true. This is achieved because in the UK it is cold most of the time! Why do we need to run an air con system when there is an ambient temperature of 10C? In a well insulated & air tight building with even a light occupancy the air con is running almost continuously. By simply bringing in ambient air this will keep a building cool most of the year. 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.

Commercial & Industrial