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 Operationally,
the only real difference between one humidity system and another is how
the liquid water is presented to the air for evaporation and absorption.
Water emitted by misters or foggers is introduced to the air in the form
of droplets that vary in size dependent on the particular system. In order
to provide true humidification, these droplets must change state from a
liquid to a vapor. In order for this to happen, they first need an air mass
capable of holding the water contained in the droplets and also sufficient
exposure time to evaporate. A seemingly straightforward scenario, however,
there are some complications. Uniform distribution of emitted water that
also allows ample time for evaporation before hitting exposed surfaces is
extremely difficult to achieve. Water emitted high in a room begins to fall
which can be observed by watching a system of this type in operation. Anything
located at upper levels including equipment, fixtures and product are likely
to see liquid water while lower levels could experience low humidity. Systems
using high speed fans in conjunction with emitters provide more time for
evaporation but suffer the same basic shortfalls as the others and are noisy
to operate. Steam is easier to distribute evenly but requires energy input
in the form of heat to generate it and energy equals dollars in operational
costs. A steam system will also impose an added heat load to the space which
may be undesirable. Some manufacturers rate the capacity of their units
in gallons emitted per hour, this can be misleading. A unit that releases
thirty or forty GPH (or whatever the rated capacity is) into an air mass
that does not have the capacity to hold it creates more problems than it
solves. The simple truth is you can't fool Mother Nature. Water that is
visible in the air is more water than the air can hold and it is going to
settle out having little or no effect on RH. Vapor, NOT water, is
what influences RH.
Since the change of state from liquid to vapor takes place within the unit NO free moisture enters the space. This greatly reduces the risk of molds and other harmful micro-organisms. The process takes place by exposing the air passing through the unit to thousands of square feet of wet surface that surrenders moisture to the air through evaporation. There is never more moisture imposed on the air than it can hold. The MegEvap Pure Vapor Humidifier also functions as an excellent filter. Trapping airborne contaminants such as spores, dust and pollen and reducing water soluble VOCs the air leaving the unit is cleaner than the air entering. Due to the self cleaning design of the media we use the contaminants are carried to the sump where they are flushed from the system. If all the advantages previously mentioned aren't enough, the MegEvap unit can also be dampered and controlled to utilize outside air when conditions permit to provide not only humidity but cooling as well. Much of the time the cooling provided can be sufficient to carry the entire cooling load of the space allowing refrigeration to be taken off line. Significant cost savings can be achieved as evaporative cooling operates for a fraction of the cost of refrigeration. A typical 15000 CFM MegEvap unit that will provide up to a 35 degree F. temperature drop requires only one horsepower, compared to a refrigeration unit with similar capacity the savings are obvious. We offer units in many different sizes and configurations from rooftop to portable to cover any application. We can also design and manufacture a custom system with any combination of options to satisfy your specific need. Standard Features
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