Combi machine for pressure and suction drying
As with pressure drying, it is often more suitable to use a Combi machine when suction drying. A combi machine comprising dehumidifier and turbine in the same unit, which facilitates and simplifies installation. The extremely low noise level also makes it more suitable for occupied residential spaces.
Corroventa’s C16 and C25 hose systems can be used to transport air while suction or pressure drying. The hose system is modular and includes junctions, hoses, pipe bends and T-connections. The system, which includes CAMLOC couplings, provides a simple, quiet and reliable installation.
In order to ensure that harmful particles do not enter the machine during suction drying, a Corrofilter must be used on the hose system for the wet air entering the turbine. The filter prevents dirt particles from being sucked into the machine, and at the same time, it eliminates the risk of fibres and other damaging particles being expelled into the surroundings along with the moist air. The Corrofilter consists of three units; a coarse filter, cyclonic separator and fine filter, using a HEPA-filter. The filtration efficiency is 99.5% for particles larger than 1um and 99.967% for fibres and mineral wool. Corrofilters are not intended to separate water; instead, a 3-Step Filter should be used for water separation.
Water Separator with 3-Step Filter System
When suction drying damage where there is free water, such as insulation in floating constructions, a water separator must be used to separate the water from the moist air stream and to prevent water from being sucked into the turbine section of the machine. We have developed a water separator with a 3-Step Filter System for the efficient separation of water, granulates and fibres during suction drying of layered constructions for use with our range of Combi and turbine systems.
The air is cleaned in the following steps
Step 1 – coarse separation
In the first step, gravel, sand and other large particles are separated from the incoming moist air stream.
Step 2 – water separation
Water and liquid droplets are separated from the air stream in a so-called droplet separator. When there is a given amount of water in the reservoir, a level sensor starts a submersible pump that automatically pumps the water to a drain.
Step 3 – particle and fibre separation
In the final step, the small particles and fibres are separated in a HEPA-filter, after which the clean moist air can exit into the surroundings through a turbine. The filtration efficiency is so high that 99.5% of all particles greater than 1µm are filtered out.
Shorten the drying time with heat
To shorten the drying time, the temperature of the air used for drying can be increased. The warmer the material to be dried is, the more efficient and quicker the drying process will be, as the vapour pressure in the wet material increases. An increase as small at 10°C can halve the drying time* in some cases *Because the drying rate is directly proportional to the difference in vapour pressure, this means that drying at 30°C 20%rh is theoretically twice as fast compared to 20°C 20%rh.
Important to consider before suction drying
It is important to bear in mind that the dry, warm air also affects all wooden material in the room where the drying process is being carried out. For this reason, care should be taken to remove or carefully wrap in plastic all furnishings that could possibly be damaged. If possible, plastic enclosure can be used, to limit the area to be dehumidified, and in this way protect surrounding material. A hygrostat can be used to advantage, to control the humidity during the drying process.