Finally, be sure all unit connections to the HVAC unit are sealed against leakage, the ERV is attached securely to the roof in case of a severe storm, and all filters and hoods are properly installed. Heat recovery units used in ventilation and air condition systems are based on some common principles: Return air; Rotating heat exchangers; ... the exchanger when the wheel passes through the outlet air flow. Airxchange energy recovery wheels are designed to last the life of the HVAC system with minimal maintenance required. Airxchange’s unique, segmented, and sustainable wheel design provides a simple yet effective means of optimizing energy transfer performance for the life of the HVAC system. An energy recovery wheel, also referred to as an enthalpy wheel or heat wheel, is a major component in an energy recovery ventilator (ERV). Wheels should not be used with certain exhaust air compositions like paint, noxious fumes/acids/biohazards. Airxchange wheels are designed to last the life of the HVAC system, and come with a 5-year warranty and an AHRI third party test and certification label verifying published performance. The reason is simple: Wheels transfer latent energy (moisture), plates do not. For these reasons, building code requirements for energy recovery ventilation require a minimum of 50% total (heat and moisture) effectiveness. When and when not to use the energy wheel continues to be a source of confusion we see on our jobs. When a wheel is mounted horizontally, each corner must be properly supported to minimize racking. Get contact details & address of companies manufacturing and supplying Heat Recovery Wheel, Energy Recovery Wheel across India. A unique flute design, coupled with numerous other design innovations, provides for the highest possible heat transfer characteristics while simultaneously reducing pressure loss parameters. All Airxchange wheels can be mounted in any position. There are 10 key reliability areas to take into account when selecting a heat recovery wheel. The physical structure of a heat wheel resembles an aluminum disk and an exhaust fan placed in the middle of two air ducts. Airxchange has standardized on Silica Gel (Type A), a substance that has preference for the adsorption of water vapor molecules over other chemicals. Any time outside air (OA) supply has a higher absolute humidity than the indoor air being exhausted (EA), the desiccant coating will capture moisture from the OA and transfer it to EA by the process of adsorption and desorption. Energy recovery wheel technology was first introduced in the U.S. and Canada in the 1970s in response to rising energy costs. A desiccant wheel functions as a heat and mass exchanger between the process and return air streams. Typical wheels were made of metal and used on industrial applications where large amounts of outdoor air provided reasonable paybacks to the owner. Avoid plumbing vents, exhaust fans, and any other source of external air pollution. Airxchange energy recovery wheels are available through most major HVAC OEMs in a wide variety of configurations. A heat wheel is a rotating apparatus generally used to reduce the energy consumed by air-conditioning equipment in humid locations. The two common transfer mechanisms are (1) leakage driven by pressure differences between airstreams which the seals address and (2) the air carried over by the matrix by rotation from supply to exhaust and exhaust to supply. Wheel heat recovery is controlled using two methods. It was chosen to be a light and durable energy transfer material that can be easily washed clean. An energy recovery wheel consists of a circular honeycomb matrix of heat-absorbing material, which is slowly rotated within the supply and exhaust air streams of an air-handling system. Thermal wheel heat exchangers function as regenerative heat recovery systems (WRG). Because of their ability to transfer water, wheels have a much lower frosting threshold (for similar conditions, 0°F). Major HVAC manufacturers offer Airxchange wheels for new and retrofit applications. Use our latest AHRI Path A compliant software, AIRXWEB, to compare and select Airxchange AHRI Certified energy recovery components. Because the energy recovery wheel shifts work away from the mechanical system, a smaller HVAC unit with Energy Recovery will provide the same cooling capacity as a larger unit without Energy Recovery. tions occur such that the wheel may be over-humidifying the entering outdoor air. Enthalpywheel is not the term. Wheels can be integrated into replacement units such as packaged rooftop or air handler units or can be provided with a standalone ERV and connected to existing rooftop units and ductwork. Heat recovery is a method which is increasingly used to reduce the heating and cooling demands (and thus energy costs) of buildings. Heat recovery ventilation (HRV), also known as mechanical ventilation heat recovery (MVHR), is an energy recovery ventilation system which works between two sources at different temperatures. As a result, the outdoor air is conditioned closer to building conditions, reducing unit workload and energy consumed by the cooling system. Note that while frost forms at between 22 and 30 OF in a plate type exchanger, frost thresholds for enthalpy wheels are generally 20 to 30 degrees lower. Holding The Heat. All wheels have seals that act to prevent the direct transfer of air from one airstream to the other. Airxchange ERV wheels can also be used to replace wheels manufactured by others. As the wheel rotates into the incoming airstream, energy is released by the wheel to heat and humidify the incoming airstream closer to indoor conditions, reducing unit workload and energy consumed by the heating system. Wash the segments or small wheels in a 5% solution of non-acid … Commercial building indoor air regulations require frequent exchange of stale indoor air with fresh outdoor air (often multiple changes per hour, depending on building use). By utilizing precise control that CO2 control offers to a buildings HVAC system and by pre-conditioning the outside air using the energy contained in the exhaust air by using an energy recovery wheel a building can be optimized to utilize less energy. Routine maintenance can be performed by non-technical personnel. There are clear benefits to using a heat wheel. In both winter and summer, as the difference between outdoor and indoor conditions (temperature and humidity) increase, the energy reduction and resulting cost savings increase. Wheel bearings are permanently lubricated and the drive belt is under constant tension, eliminating the need for annual adjustments. Airxchange wheels were first developed for the residential market in 1981 and shortly after, a commercial wheel line was designed using light-weight, cost effective, and durable materials enabling attractive paybacks on commercial applications. Bry-Air Heat Recovery Wheel is an air to air heat exchanger. IECC 2012 will include new ERV requirements at significantly lower outside air flow due to the cost/benefit studies performed by the ASHRAE 90.1-2010 mechanical sub-committee. This process is driven by the partial pressure of the respective water vapor streams with the desiccant acting as the carrier. Without an ERV, the energy in building exhaust air is wasted to the atmosphere while new, additional energy is consumed to heat or cool outdoor air to room conditions. Follow the guide of ASHRAE 62-2007 regarding “Classes of Air” for energy recovery. The concept of the heat wheel operates on the second law of thermodynamics, wherein heat will always move from areas of higher temperature to areas of lower temperature. First and foremost, be sure there are no rooftop sources of pollution near the supply air opening. Airxchange, Inc. 85 Longwater Drive Rockland, MA 02370, Tel: 781-871-4816 Fax: 781-871-3029 Email: contact_us@airxchange.com, Improves HVAC system efficiency up to 40% –, Improves dehumidification capacity up to 75% –. As long as the water deposited is removed, the wheel stays above the frosting threshold. An Airxchange service technician will assist with on-site construction and installation, which typically takes a day and includes a 5-year warranty. Third, be sure the unit is level and any water that might blow or leak into the ERV from a driving rain can be drained. function of outdoor temperature and indoor relative humidity. Next, the apparatus requires two adjoining air streams to operate, and these air streams must be clean or otherwise pass through cleaning filters. Under summer conditions, heat and humidity are captured from the fresh outdoor air. If the application is a heating only application, a properly sized fixed plate exchanger can be successful. The Airxchange wheel may be applied with confidence in seacoast applications that have proven problematic for aluminum wheels. The fan will consume more energy, and the starting costs will be greater, thus nullifying the amount of money that would have been saved by the lower air-conditioning energy consumption. Most energy recovery devices transfer heat (sensible) energy only. Follow the manufacturer’s instructions to easily change filters, clean the wheel, adjust fan belts, and inspect the unit. Incorporating Airxchange energy recovery components into an HVAC system…. A unique segmented wheel design allows for easy removal and effective cleaning to regain full performance, something not possible with non-segmented wheel designs. Energy Recovery Wheel and is being ducted outdoors . When the OA is drier than EA the opposite occurs. By rotating between a warm and a cold airstream, the energy transfer matrix of the wheel can operate successfully to much lower temperatures. This is because the desiccant coating depresses the frost point of the wheel by lowering the dew point of the leaving air. Heat Recovery Wheel (See Fig.1) performs opposite processes in the cooling season and the heating season. The desiccant wheels are not only used for air dehumidification, but also for enthalpy recovery. In addition, first cost may be offset with energy recovery incentives offered by many utilities and local/state/federal governments. Another advantage to this is that it then lowers the size of the equipment needed to cool or heat the area. Airxchange energy recovery technology enables Energy Recovery Ventilators, commonly referred to as ERV systems, to provide fresh outdoor air at 1/3 the cost of conventional systems. The ability to remove moisture from outdoor air in summer and add moisture in winter makes energy recovery wheels ideal for most climates in the U.S. and Canada. In this way, better control of humidity levels, mold, and mildew is assured. Outdoor air raises Indoor Air Quality (IAQ) by reducing indoor air pollution improving the health and productivity of building occupants. Calculate the reduction in required cooling energy. Wheels prove to be much more compact for airflows in excess of 1000 CFM. When the ratio of exhaust to supply is less than 50%, the use of the wheel is generally uneconomical due to lower system effectiveness. The amount of heat transferred can be expressed as True 3Å Energy Recovery Wheel Unit — The complete, ready to install assembly consisting of motor, cassette seals, drive hub assembly controller(s) and sensors . The device lessens the load on ventilation air-conditioning, thus reducing energy consumption and subsequently the long-term air-conditioning costs. Figure 1 compares the frost threshold of a typical plate-type sensible heat exchanger with that of a typical enthalpy wheel. Energy Recovery Wheels also known in the industry as Energy Conservation Wheels, Energy Recovery Wheels, Enthalpy Wheels, Sensible Wheels, Hygroscopic Wheels, Condensation Wheels or Sorption Wheels. Our energy recovery technology provides a stable, robust product proven in hundreds of thousands of installations in almost every climate and facility type. Airxchange uses Urethane, a durable material that is impervious to chemicals and aging that typically attack rubber based products. While the desiccant on the surface of the energy transfer matrix reduces the moisture content of the OA with respect to the exhaust, a percentage still enters the building. A run around loop may be the better choice to isolate the exhaust. Airxchange has a patented and proprietary process that essentially ‘melts’ the desiccant into the plastic energy transfer matrix so it is permanently fixed. If it is a comfort conditioning application with some toilet exhaust, the wheel can safely and successfully be used. The heat wheel is best used in locations where a large intake of outdoor air is needed, and where there is an exhaust air duct close by. Uniting Health, Energy, and Environment – Airxchange Energy Recovery Technology improves building HVAC system performance by efficiently preconditioning the outdoor air supply. Industrial exhaust conditions (weld shop for instance) may have special requirements. It also passes through the heat exchanger, giving up heat, and is helped on its way by the second blower, colored cyan. Airxchange wheels are the narrowest offered which minimizes the effect of (2) and limits the transfer in comfort applications where the pressures are balanced between supply and exhaust air streams to 3-5% total, well inside safe limits for comfort applications. There are two ways that air can leak from the exhaust side to the supply side of a wheel: Cross-Flow Leakage – occurs when air leaks from the exhaust side to the supply side through the seals or any gaps in the construction.. Two states, Maryland and Rhode Island, have adopted Standard 189 as their "Stretch Code" for new buildings. Filters also are in place to ensure that the air entering and exiting the apparatus are clean. Another drawback to fixed core/plate exchangers is size. One is to bypass supply air around the wheel and mixed with the remaining air to regulate temperature. Airxchange makes one of the most corrosion resistant cassette/wheel combinations available. As the device absorbs warmth from the air, the outdoor air stream temperature consequently drops. For good humidity control, it is important that the cooling system be sized so the evaporator coil remains cold enough to remove moisture from the supply air before it enters the building’s ventilation system. Rotating between two airstreams within the ERV cabinet (exhaust air and supply air), energy recovery wheels transfer heat and humidity from the warm/humid airstream to the cool/dry airstream. The heat wheel utilizes a huge surface area by means of a coil of materials such as mylar and other such stuff wound into a large disc which allows the air to pass through. Studies show that increased levels of outdoor air provides health and productivity benefits. The heat wheel accomplishes thermal equilibrium by first being chilled by cool air directed by the exhaust fan. 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