Rotary heat exchangers 2015 by Hoval USA

More catalogs by Hoval USA | Rotary heat exchangers 2015 | 28 pages | 2017-03-16

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Page 12 of Rotary heat exchangers 2015

structure 3.3  peripheral slide seal 3.4  transverse seal high tightness seal ■ in rotary heat exchangers with sheet-metal casing automatically adjustable constant-force springs are mounted on the wheel mantle they press the abrasion-resistant slide seal against the casing the patented system permanently minimises leakage and allows the unit to be sized for smaller air flow rates ■ in the profile casing a ring seal with externally accessible double springs is used they press the seal to the casing and to the wheel basic tightness seal ■ in rotary heat exchangers with sheet-metal casing sealing strips are mounted on the wheel mantle e.g brushes these guarantee the minimal sealing effect for the air flows that is usual for devices on the market fig 14:  high tightness seal fig 15:  peripheral slide seal in profile casing fig 16:  basic tightness seal 10 the transverse seal between the two air streams consists of adjustable aluzinc sheet steel with a triple rubber-lip seal 3.5  drive the wheel is driven by an electric motor and belt the motor is generally fastened on the left or right on a rocker in the casing because manufacturers of ventilation units and installers sometimes install their own drive hoval offers this component as an option 2 versions are available constant rotational speed the motor is switched on and off by a single switch or contact output regulation i.e changing the temperature efficiency or humidity efficiency is not possible controllable rotational speed the drive motor is controlled by a control unit a frequency converter fu is generally used common additional functions are speed monitoring by inductive sensors and intermittent operation if heat recovery is not required the wheel is moved slightly at intervals to prevent dirt build-up the control unit and as a result the wheel are normally actuated by the room temperature controller for which the rotary heat exchanger is perceived as an energy resource for both heating and cooling which forms part of the cascade control concept.