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The SSCR Rotor for Desiccant Dehumidifiers - from Seibu Giken Seibu Giken was the first company to develop a silica gel rotor. They remain the world leader in this technology. All DST desiccant dehumidifiers use the Seibu Giken silica gel rotor. In the Seibu Giken rotor the silica gel is chemically bonded to the structure, which means that there is no desiccant carry-over to the air. It also means an excellent lifetime. After 10 years of operation the Seibu Giken rotor retains more than 90% of its original capacity. Another important feature is that the Seibu Giken rotor can be washed if it becomes contaminated. This is especially important for rotors working under harsh conditions. |
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| Tests carried out by the well-known Frauenhofer Institute show that no desiccant particles are carried out of a Seibu Giken rotor. Tests on our desiccant dehumidifiers placed in sewage stations have also shown that the rotor is bacteriostatic. The adsorption rotor is manufactured from alternate layers of flat and corrugated sheets, impregnated with an active component (desiccant). It is made to form a vast number of axial air channels running parallel through the structure. As air passes through these channels, moisture is transferred between the air and the desiccant. The rotor is the most important component in a desiccant dehumidifier. It is the rotor that determines the capacity, efficiency and lifetime of the equipment. If a dependable, stable and efficient rotor is required, then the following factors must be considered:- |
| 1) The desiccant material |
| Back in the fifties, when the desiccant rotor dehumidifier was invented, lithium chloride salt (LiCl) was used as the desiccant. Lithium chloride absorbs the moisture through a chemical reaction with the water molecules. The disadvantage of a LiCl impregnated rotor is that it becomes unstable at high humidity levels and the salt begins to deliquesce (dissolve). Not only does this rapidly destroy the rotor capacity, but corrosion of the dehumidifier casing and associated materials is likely to follow. Today, most desiccant dehumidifiers use silica gel rotors. The silica gel adsorbs the moisture, the water molecules adherering to the surface of the silica gel. The main advantage is that these rotors are unaffected by saturated air and, if the silica gel is chemically bonded to the rotor, will also have a long lifetime (typically in excess of 10 years). |
| 2) Will there be dust from the rotor Both lithium chloride and silica gel rotors containing "loose" desiccant will create dust particles which leave the rotor in the airflow. Apart from possible damage to products, the capacity of the rotor will soon deteriorate. Only rotors with chemically bonded silica gel will have no desiccant carry-over to the air. |
| 3) Washability If the rotor is accidentally contaminated or used in applications with contaminated air, for example oil mist, it is important that the rotor is easily washable on site. Sending the rotor away for washing is expensive and causes longer equipment 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 reactivation temperature used (above 120°C), and to the low relative humidity of the dry air. |
SSCR-H In association with Seibu Giken DST’s 20’th anniversary 2005, DST offer you a new dehumidification rotor, specifically developed to maintain the desired indoor climate in the food and pharmaceutical industry. The SSCR-H can be installed in new or existing rotor-units from Seibu Giken DST. |