heat (or Enthalpy) Wheels-ㅡmore detailed

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Enthalpy Wheels

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Description
The AIRotor heat recovery unit is a rotary heat exchanger which operates on the air-to-air principle of heat transfer. It provides a way of recovering air conditioning energy in hot, humid climates.

Design Considerations
Cool, dry, exhaust air enters one side of the rotating Heat Wheel, chilling the wheel and drying the desiccant coating. This cool and dry part of the wheel then rotates into the supply air where it absorbs heat and humidity from the incoming fresh air before the air is mechanically cooled to room temperature. The Heat Wheel can reduce the ventilation air-conditioning load by up to 90%, which saves energy and reduces the size of required air-conditioning equipment.

More info on Xetex's line of Enthalpy Wheels

• Selection - Find which Heat-X-Changer is right for you.
• Unit Designs - See mechanical drawings and specs.
• Independent Lab Testing (Microsoft Word Doc.) - Find out how enthalpy wheels have performed in independent lab tests.
• Cross-Contamination Testing (Microsoft Word Doc.) - Learn about an independent lab test on the cross contamination performance of XeteX Enthalpy Wheels
• Accessory Engineering (soon!) - Get more information on dampers, filters, etc.
• Controls - Learn about our Enthalpy Wheels' controls systems.
• Applications (soon!) - See which applications are right for Enthalpy Wheels.
• Installation - Learn about our installation process.

Advantages

• Available in 16 sizes, with a nominal flow range of 500-28,000 CFM.
• Total energy recovery efficiencies as high as 90%.
• Rotor has smooth air channels to ensure a low pressure drop and reduce the risk of fouling.
• Rotor surface is manufactured absolutely smooth allowing for tight fitting seals between airstreams.
• Available with electronic speed control for variable rotor capacity.
• Hygroscopic rotor provides latent and sensible heat recovery.

Construction
The RVA heat recovery unit is constructed from a rigid steel welded frame, with insulated galvanized sheet metal cover plates and hatches. The frame is reinforced to prevent deflect of the rotor from static pressure drops to less than 0.003 inches.

The rotor is assembled from alternate layers of flat and corrugated thin sheet aluminum. The smooth channels formed by this construction ensure that the air flow is laminar, thereby ensuring that the pressure drop is low and minimizing the risk of fouling by dirt or dust. Dry particles up to 900 microns shall pass freely through the rotor without clogging the media. The rotor media can be cleaned with low temperature steam without degrading unit performance.

The hygroscopic rotor equally transfers both sensible and latent heat. Moisture is transferred between airstreams in the vapor stage so media remains dry and no drain pan is required.

The rotor, which may be removed from the frame, is mounted in sealed permanently-lubricated spherical ball bearings. The bearings can be serviced or replaced without removing the rotor from the case.

The exchanger is sealed with brush seals between airstreams and around the perimeter of the rotor. Because of the smooth rotor surface, the brush seals provide an extremely effective seal with very little contact pressure, resulting in extended service life.

An adjustable purging sector is provided to ensure continuous cleaning of the rotor and to virtually eliminate cross-contamination between the exhaust air and the supply air.

The standard AIRotor heat recovery unit is supplied with a perimeter self adjusting belt and worm drive for on/off operation.

For installations where there is a requirement for controlling heat recovery capacity and/or rotor frost control, the heat recovery unit is equipped with an electronic control unit that varies rotor speed from maximum speed down to an automatic purge cycle of 1/20 rpm.