Evaporative Cooling – Harnessing the Power of Nature
What is Evaporative Cooling?
Evaporative cooling (or e-cooling) is a system that uses only water and a fan – no compressors. It works by pulling warm, dry air through water-soaked pads which is humidified and cooled instantly.
Evaporative cooling meets most personal and machine climate requirements throughout South Africa, specifically Gauteng. It does so, however, at a fraction of the running cost of conventional cooling systems. In most cases, you can save 60 – 90 percent on your energy costs.
An Indirect evaporative cooler can meet most building cooling loads using 25 percent of the energy of a conventional system.
Evaporative cooling can also be applied cost-effectively when integrated with conventional chiller systems, which can greatly improve a facility’s load profile.
Why Choose Evaporative Cooling?
The initial cost of an evaporative cooling unit is often half that of a conventional system. However, the key savings lie in the cost of ownership. A single large evaporative cooler is usually comparable to a 60 000 BTU ducted hide-away.
However, where the compressor driven unit will use a maximum of approximately 7 KW, the evaporative cooler will only use a maximum of approximately 1 KW to cool the same or larger area!
Moreover, the cost of annual services for evaporative coolers is far lower as there are fewer mechanical and serviceable parts.
Health & Environment Benefits
Brings in 100 percent fresh outside air that is cooled, washed and humidified.
Improves comfort with natural ventilation and no stuffy, stale air.
Adds moisture to the breeze, which makes it comfortable and pleasant to sleep with the system running.
evaporative cooling positively pressurizes the building, displacing warm air, dust, pollen, smoke, odour, air-borne bacteria and even certain flying insects like mosquitos!
Maintains higher humidity and cuts static electricity, benefiting people, furniture and equipment.
Has no CFCs or HCFCs.
Uses up to one-tenth of the energy of a conventional cooling system.
Evaporative coolers can operate using grey water which makes them an eco-friendly alternative.
Increased Comfort and Performance
In most industries, the heat of summer brings on increased heat-related illness, lower productivity and increased absenteeism. Many companies cannot afford the tremendous costs of conventional refrigeration or air conditioning, but they can afford evaporative cooling.
In summary, evaporative cooling is economical to install, operate and service. It is more effective in cooling and it provides much-needed alternative to conventional mechanical refrigeration.
Evaporative cooling lowers effective temperature – which is what you feel – by at least an additional 4°C to 6°C from ambient.
The cool breeze increases skin surface evaporation, resulting in body heat loss.
The constant flow of cool air displaces heat through open doors and windows from all heat loads inside.
This results in a reduction of the heat radiated (from lights, servers, computers or kitchens) to the people inside.