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Energy Savings

One of the major benefits of evaporative cooling is the reduction (or elimination) of refrigeration compressor horsepower required to condition outside air. In applications where conditioned outside air is required for ventilation operating costs can be reduced by as much as 80% .Often this can be achieved simply and economically with the addition of an evaporative wet section on the fresh air intake of an existing air handling or ventilation system utilizing fans or blowers already in place.

In a situation where a 10,000 CFM supply air stream needed to be taken from 90 degrees F. and 25% R.H. to 67.5 degrees F. it would require roughly 25 compressor horsepower using conventional refrigeration air conditioning. The power required to achieve that same 22.5 degree drop through a MegEvap™ evaporative wet section is 1/6 horsepower. It’s easy to see how fast savings can accumulate. Evaporative cooling is a very attractive alternative to air conditioning in many applications, it’s low cost of operation and maintenance even make it possible to condition areas thought to be too expensive or too large to cool in the past. Some prime candidates for evaporative systems are manufacturing facilities, warehouses, prisons, repair and welding shops, machine rooms, stock confinement areas, milk barns, poultry houses, winery barrel rooms, packing sheds and produce operations.

Air Filtration
Along with the other benefits evaporative cooling has to offer is very effective air filtration. Contaminants in the air stream are forced against the wet surfaces on the interior of the rigid media where they are trapped much like an insect on fly paper. From there, because of the self cleaning design of the media the contaminants are washed to the sump where they are easily flushed. The larger particulates can be filtered before they enter the media with the addition of optional pre-filters. An evaporative system will effectively filter spores, pollen, dust, smoke and other particulates. They will even reduce water soluble VOCs and atmospheric pollutants such as CO, CO2, SO2, and Nox gases resulting in a significant improvement in air quality. Simply put the air coming out is better than the air going in.

Additional Economic and Environmental Benefits
A business utilizing a MegEvap™ evaporative system will be viewed as making an effort to reduce pollution and greenhouse gases. By reducing operating time on conventional refrigeration systems generated power requirements are consequently reduced along with the risk of CFC release. Reduced time on refrigeration compressors as well as a reduction in the associated maintenance and the extension of the useful life of the equipment is also worth consideration. The fact that any maintenance on an evaporative system can be performed quite easily by unskilled labor is also an advantage over conventional cooling equipment. Another possible benefit for facilities that reduce energy consumption through the use of evaporative cooling is energy rebates from participating power companies. The use of refrigeration condenser pre-coolers can be considered a form of electrical peak shaving as they provide the greatest energy savings during the hottest time of the day when electrical demand is highest. Evaporative cooling is considered a "green " technology.

Techincal Information
Here are some common evaporative cooling formulas that maybe helpful in calculating the effectiveness and/or size of system you need.

Evaporative (Direct) Effectiveness:

E = (Tedb - Tldb) / (Tedb - Tewb) x 100

Tedb = Temperature Entering Media, Dry Bulb °F
Tldb = Temperature Leaving Media, Dry Bulb °F
Tewb = Temperature Entering Media, Wet Bulb °F

Water Evaporation Rate Estimate:

Gallons per minute = V x (Tedb - Tldb) / 500,000

V = Air Volume in cubic feet per minute (cfm)
edb = Temperature Entering Media, Dry Bulb °F
Tldb = Temperature Leaving Media, Dry Bulb °F

Rule of Thumb Air Volume Requirement:

Air Volume, V = Ls x Ws x Hs x (ACs / 60)

Ls = Length of Space to be cooled (ft)
Ws = Width of Space to be cooled (ft)
Hs = Height of Space to be cooled (ft)
ACs = Air changes of space per hour (typically, 15 to 20)