Principle of Rotary Heat Exchanger

Ostberg rotary heat exchangers are classified as regenerative air-to-air energy recovery units. Air-to-air energy exchangers can recycle up to 85% of energy from conditioned building exhaust, or high temperature exhaust from industrial processes. Exhaust recovery ventilation utilizes energy from the exhaust air stream to precondition the outside air being introduced into the building. In the winter it provides free heating and in the summer free cooling.

Rotary heat Exchanger always rotates , the below half of rotor is cooled and dried by return air, while return air becomes hot and humid exhaust air. When this half of rotor rotates into supply air duct, it can cool down and dry the outdoor air become cooled and dry supply air while the rotor itself becomes hot and humid. When it rotates into the return air duct, the half of rotor will repeat the first step. 

The rotor matrix consist of small sinusoidal channels made from thin aluminum foil. Untreated aluminum foil is used for sensible heat recovery. Epoxy-coated aluminum or seawater resistant foil with higher magnesium content is best suited in installations in aggressive environments such as industrial or maritime locations. Sensible rotors transfer only humidity during the winter when exhaust air condenses in the rotor matrix and is taken up by the supply air stream.

Hygroscopic or sorption-treated rotors transfer airborne humidity (latent energy) year round. The aluminum foil in hygroscopic rotors is oxidized to create a surface that transfers humidity.

Sorption rotors foil is permanently coated with sorption material of the type 3A molecular siever, which has an extrmely hugh humidity transfer capacity.

New sorption rotor range from stberg OM (Molecular Sieve 3A)

Ostberg introduces it latest product development in field of high efficiency energy recovery wheels with special focus on humidity tranfer. Intensive research works in our own laboratory has given excellent results. Our new OM sorpyion treatment has state of the art performnance.

• Lower investment cost in cooling
• Lower energy consumption in cooling period
• Better performance for dry cooling systems
• Profitable investment from day 1
• Helpful solution when cooling capacity is limited in existing systmes

The newly developed production process with coating machine guarantees even and high quality on sorption treatment.