This is exactly how Scanair dehumidifier’s work, with a fewer minor differences to improve the effectiveness. A fan is used to speed up the process. It blows warm air onto cold metal coils, and the resulting water drips into a bucket. The resulting cold air is then passed over warm coils to bring it back to room temperature. Air conditioners work in the same way, but they do not reheat the air before returning it to the room.

How Dehumidifiers work

Scanair Heat pump dehumidifiers extract water from the air by using a heat pump that is similar to an air conditioner. First, a fan pulls the indoor air across a very cold coil, which causes the moisture to condense. The droplets drip into a bucket inside the unit. The dry air is warmed by a second, heated coil and exhausted at room temperature. These dehumidifiers are considered among the most effective.

Scanair produce various types of dehumidifier and specifications as per customer requirements. Refrigeration-based dehumidification systems are more economical than desiccants at high temperatures and high moisture levels. In general, mechanical refrigeration systems will come down up to 40% RH.

Desiccant-based systems are more economical than refrigeration systems at lower temperatures and lower moisture levels. Typically, a desiccant dehumidification system is utilized for applications below 40% RH down to 1% RH.

Thus, in many applications, a DX or chilled water pre- cooling coil is mounted directly at the dehumidifier inlet. This design allows for removal of much of the initial heat and moisture prior to entering the dehumidifier where the moisture is reduced even further. Chemical absorbent dehumidifiers work best in warm climates.

They use a chemical drying agent, or desiccant, on a heat exchange wheel to absorb water molecules from the air. Damp air is sent outside via vents. Desiccant dehumidifiers use a lot of energy. They are more commonly used by industries than homeowners.

Dehumidifiers Industrial Applications

Scanair Dehumidifiers meets wide range of industrial needs, which has become an essential machinery in production of various components, some of the major industrial applications are – CNC Machines Control Cabinets, Candy Manufacturing, Fertilizers / Powder Storage Warehouses, Paint Booth and Paint Lines, Laundry and Dry Cleaning Establishments, Agricultural Produce Storage Buildings, Warehousing & Storage Areas, Drying Rooms

Scanair desiccant dehumidifier is built to suit GMP applications it is provided with pre filter 10 and 5 micron main filter with 0.3 micron Hepa media filters are available its start from 50 Cfm To 5000 Cfm standalone model single phase 220 Volt 50 Hz, Three phase 440 Volt 50 Hz options. Desiccant-based systems are more economical than refrigeration systems at lower temperatures and lower moisture levels. Typically, a desiccant dehumidification system is utilized for applications below 35% RH down to 1% RH. Thus, in many applications, a DX or chilled water pre- cooling coil is mounted directly at the dehumidifier inlet. This design allows for removal of much of the initial heat and moisture prior to entering the dehumidifier where the moisture is reduced even further.

In order to achieve the controlled air requirement listed above, refrigeration equipment alone becomes uneconomical, impractical and cumbersome to design, operate and maintain.  On the other hand desiccant type dehumidifiers combined with refrigeration can offer a simple and economical solution to controlling both temperature and humidity levels as low as necessary.

Desiccant Dehumidifier for Storage or Processing Film and Paper

Desiccant Dehumidifier is the perfect solution for processing and storage of film and paper. All photosensitive materials deteriorate with age, the rate is largely dependent upon the ambient conditions. Deterioration increases rapidly under high temperature and humidity levels. High humidity alone is usually more harmful than high temperatures. High humidity levels can accelerate loss of sensitivity and contrast, increase shrinkage, produce mottle, cause softening of the emulsion, and promote fungus growth.

Under extremely humid conditions, film or paper should be both exposed and processed as soon as possible after the package is opened.  If exposed products cannot be processed on the same day that they are exposed, they should be kept in a dehumidified cabinet or store room. Color films or papers should be stored at 50˚F or lower. Air conditioning with relative humidity control provides the most desirable storage conditions for unprocessed products.

The required storage conditions for developed film and paper depend on:

• The value of records
• The length of storage time
• Whether the films are on nitrate or safety base
• Whether the paper base is resin coated
• The type of photographic image

High humidity damages gelatin, encourages the growth of mold, increases dimensional changes, accelerates the decomposition of nitrate support, and accelerates deterioration of both black and white and color images. Medium-term storage of photographic film is suitable for preservation for up to ten (10) years. The most satisfactory humidity and temperature levels for storage are 30%-40% RH at 24 -28˚C.  A desiccant dehumidifier with cooling coils is the most efficient and economical means of accomplishing the desired conditions. The archival storage of records on film also requires environmental control of about 15%-30% RH at temperatures below 22˚C.

Proper preservation of photographic materials is complicated because each of the phases is controlled by a separate group. The composition of the film or paper is controlled by the manufacturer, the processing by the processing laboratory, and the storage conditions by the customer. The importance of environmental control in all three phases must be recognized by all in order to assure a high quality final product.

Desiccant Dehumidifier application areas

Desiccant Dehumidifiers are widely used in Industrial drying, Instant noodles drying, Noodles drying, Rice powder noodles drying, Soya products & pepper drying, Mushroom drying, Onion drying, Fruits drying, Herbs drying, Wood drying, Drugs drying,  Fish drying, Tea drying, Potato chips drying, Dried shrimps, Tobacco storage.

Scanair room dehumidifiers are manufactured under GMP Standards the outer body and inner fabrications are made with SS 304, 316 L Grade material used as per customer requirements. These units can be used special application in the industry like pharmaceutical packing, Food powder packing areas. Scanair introduced new refrigeration multiple directional airflow technology used in the evaporator coil to get the maximum refrigeration capacity utilized in the system with lower power consumption and condenser heat ex-changer which facilitates the use of internally grooved enhanced high performance tubes and permits liquid to be circulated at higher velocity through the tubes resulting in greater heat transfer and higher operating efficiencies.

Humidity Control for Packaging Equipment Rooms

Frequently, the equipment used to package products will not function efficiently or properly if the surrounding air is humid. Candy wrapping machines and packaging machines for food powders or drug packets are typical examples. Something as simple as a cake mix becomes a double problem, not only does the powdery mix clump and not flow properly in humid conditions, but the packaging equipment is also hindered by the humidity.

Depending on the product, it may be necessary to dry the packaging room and even go to the extreme of providing a dry bath for storage bins or hoppers, especially where powders are used. In situations where packages are heat-sealed, a container’s own moisture content may adversely affect the adhesion of the sealing material being used. Here neither the product nor the machinery is directly responsible for the problem; instead, the moisture content of the package is the culprit. Surrounding the area with dry air is the solution, where our dehumidifiers are the excellent option for humidity control.

Dehumidifiers in Food Production

Dehumidifiers play a huge role in food production and preservation. When exposed to high relative humidity, such familiar foods as potato chips, dry breakfast cereals, and soda crackers exhibit an affinity for water. These and similar foodstuffs are manufactured using high temperature processes, so we expect that excess water has been driven off and the foods are dry. However, if these foodstuffs are allowed to remain exposed in a humid environment, even for a short time, they will absorb water from the surrounding air. Although the quality is not affected, these foods characteristically become soggy and rubbery-and generally not very appetizing. In processing such powdery foods as cocoa, gelatin, and dehydrated concentrates, the presence of moisture in the surrounding atmosphere can cause tiny particles of the powder to stick or cluster together, thus inhibiting their free flow in manufacturing or packaging processes.

Processing machinery also can be affected by moisture in the air, which can interfere with operation and obstruct the free and easy movement of the foodstuff. Obviously, when moisture can have such a profound effect on food and/or machinery, the solution lies in conditioning the air surrounding the processing and manufacturing area.

Room Dehumidifiers Application Areas

Room Dehumidifiers are widely used in the following areas, Pharmaceutical compression process, Blister packing areas, Food powder packing areas, Welding electrodes storage, Dry herbal storage, Drying Rooms, Capsule filling rooms, Tablet punching rooms.