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What is direct evaporative cooling?

Breezair, a trusted name in direct evaporative cooling, is renowned for its high-performing, world-class coolers that deliver exceptional efficiency and unmatched performance.

Whether you need cooling for medium or large commercial applications, industrial plants or in general large areas, award winning Breezair brand provides uncompromising safety, reliability, comfort and energy-efficiency. Seeley International never stops striving to innovate and build the world’s most energy efficient products: evaporative cooling is fast becoming the most efficient option when cooling large or open-air spaces.

The Benefits

Evaporative air conditioning offers a range of benefits, making it the perfect and efficient cooling solution. It’s simple to maintain and operate, while also delivering exceptional performance. Beyond just cooling during hot weather, evaporative air conditioning is ideal for removing excess heat generated by processes within a facility. With escalating energy costs, it provides a distinct advantage over traditional air conditioning systems, offering superior energy efficiency, healthier airflow, and easy installation and maintenance.

Applications

The Exclusive UK Distributor for Breezair

CPA Engineered Solutions is the exclusive UK distributor for Breezair. With decades of experience, our team provides expert guidance, professional installation, and comprehensive service support. We ensure your Breezair system is optimised for peak performance, delivering reliable, sustainable, and highly effective cooling for your facility.

FAQs

It uses the natural principle of cooling by evaporation. Wet your finger and hold it in the air and it becomes cool; that is because evaporation is occurring; it is a natural phenomenon. In the Evaporative Air Conditioner a pump circulates water through a set of cooling pads through which air is forced by a motor driven fan. The hot outside air passing through the pads evaporates the water in the wetted pads at a very high rate. This cools the air which is then pumped into your building.
That depends on the temperature and humidity of the outside air (the ambient temperature). Have a look at the temperature chart below and you will see the answer. For example, at a temperature of 25 C and a relative humidity of 50% the air from a Breezair Evaporative Air Conditioner will be at 20 C, i.e. a 5 C drop. Or, at a temperature of 35 C and a relative humidity of 30% the air from the Cooler will be 25 C, i.e. a 10 C drop.
Because the air being pumped in collects heat and moisture and impurities from inside the building and it must therefore be exhausted. The Evaporative Air Conditioner does NOT recirculate the inside air, and if you close the building the effectiveness of the machine will be greatly diminished and you will become very uncomfortable.
In most cases, it does slightly. BUT remember that the temperature has also dropped. It is the combination of temperature and humidity that creates human comfort, and Evaporative Air Conditioners are used so widely around the world because they can create comfortable conditions. For example, 80% humidity and 30 C is very uncomfortable, but 80% humidity and 16 C is quite comfortable. Furthermore, comfort is also improved by increasing air velocity in hot conditions and Evaporative Air Conditioners create sufficient air movement to also minimise the effects of humidity.
The installation location must support the cooler’s weight (approx. 100 kg) and provide access for maintenance and fresh air. Coolers are usually installed on roofs. A steel support frame may be needed if the roof lacks a self-supporting duct or there’s a significant gap. Skylight openings can avoid roof drilling, and at least 300 mm clearance is required between the cooler and the roof. For wall-mounted installations, a steel frame is always required. Maintain a minimum of 400 mm from the duct bend to allow the weather seal to open and 600 mm from the wall for airflow. Windows can be used instead of drilling into walls. Refer to the manual for further details.

Properly maintained evaporative coolers will not transmit the bacteria because they do not produce aerosols. Evaporative coolers should not be confused with cooling towers or evaporative condensers, which involve different technology. Evaporative air conditioner water temperatures are much lower which prohibits the growth of legionella. Secondly, in a high quality evaporative cooler, water is drained from the unit when it is not being used, so there is no standing water that could rise to ambient temperature. Above all, well designed evaporative air conditioners do not produce aerosols, meaning that even if bacteria were present in the cooler, there is still no mechanism that could transfer the bacteria to humans. Moreover, there are no recorded cases of this technology causing Legionnaires’ disease and research indicates transmission of the bacteria is not possible by the evaporative cooling method.

The amount of water used is directly proportional to the amount of cooling being supplied — more water used, more cooling supplied. The water consumption is also affected by the humidity of the day — more humidity, less water used. It also depends on the setting of the machine — high speed operation uses more water. And finally, it depends on the Bleed setting. As a guide we can advise that, at minimum Bleed setting and at high speed setting and at a Relative Humidity (RH) of 30%, the water usage is about 7 Litres/hr per 1000 m3 /h (600cfm) of air flow. At a Relative Humidity (RH) of 50% the rate is about 5 Litres/hr per 1000 m3 /h air flow. For example, a TBA550 has an air flow of 10800 m3 /h at 80 Pa so it will use about 76 Litres/hr at 30% RH and about 54 Litres/hr at 50% RH.
Yes, because they are simple machines. It is important to check and clean the cooling pads regularly, especially if the cooler is located in challenging conditions – at least every 6 months. It is also important to prepare the coolers for the different seasons and to ensure the water is drained from the tank before winter. Those with V-belt drives need the drive system checked and adjusted once a year. We can offer a full customised service plan based on the installation, access and conditions using qualified and trained technicians.

You will be surprised at how little power it uses – much less than conventional air conditioners. Using only water and low energy motors, running costs can be 80% less than conventional types.

Evaporative cooling is one of the most efficient solutions for cooling large industrial and commercial spaces, where traditional air conditioning often isn’t feasible due to high capital investment and running costs.

In industries with significant heat loads—such as printing, ceramics, glass, rubber, and electronics—many facilities lack an effective cooling system. This can lead to reduced productivity, lower employee morale, and potential health concerns. Evaporative cooling offers an ideal solution in these scenarios, providing efficient and cost-effective cooling.

In addition, many industrial environments have specific areas that become uncomfortably hot due to equipment like machines or ovens. Instead of cooling the entire space, targeted evaporative cooling units can be deployed to create a flow of fresh, cooled air, providing relief in these localised hot spots.

Case Studies

Are you Looking For Spare Parts?

We offer a comprehensive range of genuine replacement parts and service expertise to keep your system operating efficiently. Our team can advise on suitable replacement options and upgrades to ensure reliable and economical cooling for years to come.