Some pharmaceutical products are hygroscopic and have a water content related to the relative humidity of the surrounding air. In order to obtain high quality and durability of the product, the product must be produced and stored in low humidity conditions, often below 30%RH. 

Production rooms in this application are usually clean rooms, which use a high fresh air exchange without re-circulated air. CAL-IN’s line of dehumidifiers are connected to standard AHU equipment as pre-coolers and/or post-coolers.  CAL-IN’s line of dehumidifiers can also be supplied as a total system, which includes pre- and post-cooling.  A total system will control the relative humidity and the temperature in the production room. 

The dehumidifier cabinet is made of stainless steel, which is suitable for pharmaceutical production. The rotor is used is silica gel, which allows for non-bacterial dry air production. Upon request, we can supply the dehumidifier with a hygienic rotor or a lithium chloride rotor. The belt driven process air fan can be selected to achieve the external pressure needed for the total installation.  

For the pharmaceutical production, the dehumidifiers typically use electric- or steam heaters for the regeneration process. Using silencers in the ducting, the CAL-IN’s line of dehumidifiers is nearly silent.  

Confectionary 

Many products in confectionery industry are coated with sugar or a sugar-substitute.

The coating is applied in a water-based suspension. This is sprayed over the center in a rotating pan. Air is then blown on to or through the product in order to evaporate the moisture. This process is repeated many times over to obtain the final percentage of coating required. Many of these centers are thermally sensitive, so a high air temperature is not desired.

Most of the time the product is dried in sequential cycles. The drying time is often 90% of the total coating time.

The majority of attention has been focused on achieving a constant flow of dry air in order to maximize production capacity. ?This has to be achieved by following a uniform drying process throughout the year. Drying time is not affected by seasonal variations. The optimal system for this application is one that produces dry air via sorption dehumidification combined with refrigeration and heating.

Ambient air is filtered and pre-cooled, reducing it’s moisture content with CAL-IN’s line of Sorption Dehumidifiers. This cooling is essential during the summer season as it enables the system to reach the low dew points required.

After dehumidification, the air is cooled or re-heated to obtain the required temperature for the process.

CAL-IN’s combined air handling systems have the following advantages:

• Clean filtered air
• Ambient air is used, affording an energy savings from the factory’s HVAC equipment
• There are no seasonal variations because the conditioned air is constant throughout the year. This creates a predictable production process
• The total process time is reduced by up to 35%
• The very low moisture level of the air allows for a rise in production capacity and affords a better quality product
• Pay back time of the initial investment is no more than 10 to 12 months

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Dehumidification Condensation Protection

Condensation takes place when humid air meets a cold surface. The air around the cold surface cools down and the water is condensed. This occurs when the dew point in the atmosphere (or the dew point temperature) is higher than the temperature of the cold surface.

Condensation is found in waterworks, where cold pipes are "sweating" during the summertime, the dew point of the air is high and the pipes are cold. Condensation also occurs in breweries where the water content of the air is condensing on the surface of the tanks. The same problem occurs in Ice Rinks.  Although the ice cools down the building, during the summertime, air condenses on the walls, resulting in damage from humidity.

In all the above-mentioned cases, the solution is to lower the dew point of the air to a value inferior to the temperature of the coldest surface. This is how you avoid condensation of the air. The only way to lower the dew point is by means of dehumidification. There are no other alternatives. When it is a question of cold rooms and/or lower dew point environments, the adsorption dehumidifier will usually be the correct choice.

CAL-IN’s economical line of adsorption dehumidifiers are used as condensation protection for:

• Containers
• Bridges
• Windmill Towers
• Waterworks
• Breweries

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The application methods for CAL-IN’s line of dehumidifiers are varied and include:

Ammunition Storage

In order to ensure that the ammunition is not damaged from humidity, an adsorption dehumidifier is installed in ammunition storage rooms. This kind of installation is in principle a question of dry Air Storage.

Protection of Tanks and Aircraft

For tanks and aircraft, it is often a question of "point- or object dehumidification", meaning that dry air is blown into the cabin of the aircraft or the internal part of the tank.

As such, electronic and optic equipment are protected against damage from humidity, which results in greater operational reliability, less errors of equipment, and a longer shelf life.

The dry-air protection takes place while the aircraft is grounded and when the tank is garaged – but it may also take place in the field by means of mobile dehumidifiers.

General Dry Air Storage

Other materials such as boots, uniforms, and parachutes are kept in dry air storage.

Explosion proof

All of CAL-IN’s line of dehumidifiers are designed to be suitable for military type explosion proof applications, i.e. all mechanical or electrical failure in the dehumidifier will not in any way affect the surroundings.*

*The air around the dehumidifiers and the regeneration and process air must be free from explosive gases and explosive solids.

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Dehumidification Dry Air Storage

Dry air storage is a non-heated storage room with a dehumidification installation. Non-heated also means that the temperature indoors is close to the temperature outdoors.  

During storage and warehousing of goods (paper, textiles, furniture, steel products, ammunition, etc.), it is necessary to provide a low level of humidity, otherwise you risk damage to the goods.  

Only few materials tolerate exposure to high atmospheric humidity for longer periods of time. Most materials will be ruined (iron will corrode, salt and fertilizers will get lumpy, wood and textiles build mold and rot, cardboard boxes lose their firmness and sustainability). 

Damage from humidity occurs around 55-60%RH. If further free water is present (condensation on cold surfaces) the decomposition will take place more quickly. 

In storage rooms, the humidity comes from the outside. If no heating or dehumidification takes place, you will have the same atmospheric humidity inside and outside. 

Traditionally, you have two possibilities for decreasing the atmospheric humidity: Heating and Dehumidification.

Heating:

Heating can be a good as well as efficient way of preventing damage from humidity. If the room (and thereby the air) is being heated, the air will be able to retain more water, and the relative humidity will decrease. 

However, heating requires a well-insulated building in order to meet the demands of building rules and regulations and in order to keep down the cost of energy. Additionally, the installation of a heating system is needed. If you heat the room to a constant temperature of 20°C, the relative humidity will fluctuate throughout the year (from 20%RH during the wintertime and up to 80%RH during the summertime) when no heating takes place. The fluctuation in %RH itself may be damaging to certain materials. Even so, heating may in many cases represent a good and necessary solution. 

Dehumidification:

Usually materials do not have special demands for temperature, but only for the humidity of the air. Consequently, an installation of a dehumidification system, that will maintain a constant relative humidity all year round, is the right solution for most materials. 

This solution provides:       

• Energy savings compared to heating alternative
• The installation of a dehumidification system is usually more simple and economic than the equivalent installation of a heating system
• There’s no need for insulation of a hall

CAL-IN’s line of adsorption dehumidifiers are used for the following types of dry-air storage rooms: 

Military ammunition magazines, stores, warehouses

• Storage of seed grain, industrial storehouses, automatic storage
• Storage of raw materials containing steel
• Storage of furniture
• In containers
• In the cargo compartments of vessels

 

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