Seibu_Giken DST Desiccant Dehumidifier


	Click on the picture above to view the Dehumidifiers

The SSCR-rotor from Seibu Giken
All DST dehumidifiers use the Seibu Giken silicagel rotor. In the Seibu Giken rotor the silicagel is chemically bonded to the structure, which means that there is no desiccant carry-over to the dry air. It also means an excellent lifetime. After 10 years of operation the Seibu Giken rotor dehumidifies with more than 90% of its original capacity! Another important feature is that you can actually wash the rotor if it has been contaminated. This is especially important for rotors working under harsh conditions. Click on the picture on the right to read about Seibu Giken rotor making history.
Tests carried out by the well-known Frauenhofer Institute show that no dust is carried over to the dry air in a Seibu Giken rotor. Tests on DST dehumidifiers placed in sewage stations have also shown that the rotor is bacteriostatic. Seibu Giken was the first company to develop a silicagel rotor and is still the technology leader. Click on to see Seibu Giken Company Profile (4 Mb)	Seibu Giken is certified according to ISO 9001
The adsorption rotor
The adsorption rotor is manufactured from alternate layers of flat and corrugated sheets, impregnated with an active component called desiccant. It is made to form a vast number of axial air channels running parallel through the structure. As the air passes through the channels it is dried.
The rotor is the most important part of the dehumidifier. It is the rotor that determines the capacity and the lifetime of the unit. Hence you want a dependable, stable and efficient rotor. The following things are important to consider when choosing. 1 The desiccant material Back in the fifties, when the desiccant rotor dehumidifier was invented, lithium chloride salt was used as the desiccant. Lithium chloride absorbs the moisture through a chemical reaction. The disadvantage of a salt impregnated rotor is that it can't withstand high humidity. Saturated air will cause the salt to partially leave the rotor and thereby decrease the capacity and cause corrosion of the dehumidifier. Today more and more dehumidifiers use silica gel rotors. The silica gel adsorbs the moisture, the water molecules adhere to the surface of the silica gel. The advantage is that it can withstand saturated air and, if the silica gel is chemically bonded to the rotor, it has a very long lifetime, up to ten years if taken well care of. 2 Will there be dust from the rotor? Both lithium chloride and silica gel rotors containing loose desiccant will cause some dust to leave the rotor with the dry air. Apart from possible damage of dried materials the capacity of the rotor will deteriorate. Only rotors with chemically bonded silica gel will have no desiccant carry-over to the dry air. 3 Washability If the rotor is contaminated by accident or used in applications with contaminated air, for example oil mist, it is important that the rotor is washable, and that you can wash it yourself! Having to leave the rotor away for washing is costly and causes a longer downtime. 4 Bacterial growth Tests on a silica gel rotor used in a water sewage plant shows no bacteria formation on the rotor. This is thanks to the high temperature (above 120°C) when regenerating the rotor and to the low relative humidity in the dry air.

Product Information: Large DH | Mid-small DH

Sorption technology All DST dehumidifiers use sorption technology, but in order to optimize for different situations DST has developed several varieties of the basic process.
	CONSORB is the basic sorption dehumidifying process. The process air (light green in the picture) is pushed through the sorption rotor. The humidity in the air is transferred to the rotor material, and the dry air (yellow) exits the dehumidifier. As the rotor rotates the moist rotor material will enter the regeneration section where hot air (dark green) will dry the rotor. The now humid air (blue) is sucked out to the outside. The Consorb-principle is normally used with low regeneration temperatures or when drying very humid air.
	RECUSORB is a continuous dehumidifier with internal energy recovery which is able to reach very low dew points. During regeneration, sensible heat is adsorbed by the rotor material. This heat is transferred to a purge sector where the incoming regeneration air is preheated and its moisture content reduced. While less heat is now required to reach the final regeneration temperature, the air will also be at a much lower relative humidity. As a result of this, the dry air outlet is both cooler and drier than that achieved by other desiccant systems.
	RECUSORB DR has one fan for both dry air and wet air. This gives an easier installation for over-pressurising the dehumidified room. The Recusorb DR-principle is used in our portable units.
	FRIGOSORB is suitable for applications where it is difficult to duct out the wet air from the dehumidified area. The unit includes a heat pump that first heats the incoming air (dark green) which dries the rotor. The humid air (blue) is cooled and water is condensed. In order to further dry the air it then passes through the rotor which adsorbs most of the remaining humidity. Thanks to the heat pump the Frigosorb is very energy-efficient.
	ECONOSORB The principle is similar to the Frigosorb-principle, but the wet air (blue) does not pass through the evaporator. The process air (dark green to the left) passes through the evaporators and is both partially dried as well as pre-cooled. Thanks to the built in cooling the dry air (yellow) has the same or lower temperature as the process inlet air.
	Aquasorb condenses out the moist and no wet air exhaust is needed. Aquasorb is easy to install and is constructed in stainless steel. Both the dry air from the rotor and the warm air from the air-cooled condenser are gathered in one large amount of dry air. Thanks to the evaporating energy, more energy is put out in the dry air than the unit consume in electric energy. Aquasorb can be delivered with a practical trolley.

Product Information: Large DH | Mid-small DH

Seibu Giken’s SSCR Metal Silicate Rotor is manufactured from alternate layers of flat and corrugated sheets of metal silicate, chemically bonded into a tissue of inorganic fibre. It is made to form a vast number if axial air channels running parallel thro’ the structure. The large surface combined with the special micro structure of the metal silicate material, ensure maximum contact area and transferability between the air and the rotor to give an extremely high capacity for water vapour adsorption.

   Click on the picture above to
   view the standard desiccant
   dehumidifier range:

Dehumidifiers are using rotors from 150 mm diameter to 3,500 mm with dehumidifying capacities from 0,5 kilograms to 600 kilograms per hour. Dry air flows are available from 50 CMH to 80,000 CMH. As well as the standard range of dehumidifiers, we manufacture custom made units specially designed to achieve maximum efficiency based on customers requirement.

For larger air flow models, the catalogs are not displayed on the web. Please
contact us via email for more technical details.

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Large Dessicant Wheel Cassettes are being made

Large DH | Mid-small DH
some Local project reference for desiccant dehumidifiers
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