Casings are available for the entire product range – Ø300 mm till Ø5000 mm – and are characterized by flexible, modifiable dimensions suitable for air handling units. The robust design prevents rotor movements that can cause leaks.
Standard casings are made from galvanized sheet steel. Casings can also be supplied with powder coatings for extra corrosion protection.
Some units have an aluminium profile (DS, D Ø2451 to Ø 4250) frame, while larger units have steel profile frames.
Purge sectors can be supplied for all casings in optional sizes of 2.5°/5°/10° or adjustable 0°-5° depending on unit pressure conditions.
All casings have adjustable brushsealing around the rotor periphery and along the centre beam. Additional seals can be provided for high pressure differentials. Standard casings are intended for vertical installation, smaller models can be ordered for horizontal installation.
All of our casings can be made to measure to facilitate installation or conversion of existing plant (not adapted for heat recovery).
Östberg Energy Recovery units can be ordered in standard sizes, with price competiveness and short delivery time. If the requested dimension is missing, Östberg can manufacture any dimension in between the standard sizes according to the customers demand.
To prevent exhaust air mixing with supply air by carryover, most installations have a purge sector. Its function is to flush the rotor matrix with outside air before it rotates into the supply air duct. In this way only outside air is present in the matrix and no carryover of exhaust air to supply air is possible. The purge sector is located on the supply discharge side of the supply air duct.
Ostberg OCS casing is equipped with an adjustable purge sector for easy adjustment of the site request.
To achieve the best possible prevention from leakage between exhaust and supply air the Östberg OCS- Casing design offer multiple options of sealing system. For standard applications a brush sealing is installed on the casing (between the rotor matrix and the casing). For improved sealing a second sealing can be installed on the rotor periphery which give a “wrap-around” sealing system. The wrap- around sealing system provide the best possible sealing system to prevent leakage along the rotor periphery. See also “3.2 Leakage/Cross contamination”.