Trane continually invests in air handler research and development of new products to adapt the changing needs of today's HVAC market. Our focus on whole systems has led to the design of many custom options that can be incorporated into standard cataloged air handler, providing a more cost effective solution than a completely custom-built unit.
These custom-engineered air handler solutions are offered as offered as factory-packaged specials that deliver Trane quality, enable simplified on-site installation, and provide proven, tested performance. The air handler solutions address such issues as humidity control, energy recovery, special acoustical needs, air filtration and the use of optional fuel sources.
Trane introduces CDQ™ (Cool, Dry, Quiet) - the latest technology in desiccant dehumidification. This new desiccant dehumidification product is ideal for facilities requiring lower dew-point settings and can increase cooling coil capacity by 20 to 300 percent. Chilled water temperature can be set higher, saving energy-plus there's no need for reheat or exhaust air.
It is a well know fact standard air conditioner coils have limited dehumidification capacity. The air dewpoint can not be lower than the coil temperature. This is the dewpoint barrier. The new Trane CDQ unit breaks this dewpoint barrier by using an innovative new technology - the Trane CDQ wheel. Add this wheel to a standard or custom unit and watch it transfer water from the supply air to the return air or mixed air. Result: the cooling coil removes more water - up to 200 percent more water per hour!
A CDQ system allows for:
To address the air cleaning aspect of IAQ, Trane developed a hybrid air cleaning system called the Catalytic Air Cleaning System (TCACS) which utilizes multiple technologies to control particulate (dust) along with gaseous airborne contaminants that can cause odors.
Achieving good indoor air quality requires consideration of the entire conditioned air system. Energy consumption also plays a part in the equation.
Trane Catalytic Air Cleaners use a photocatalytic oxidation (PCO) process that uses a titanium dioxide treated media activated by UV-C energy to create a hydroxyl field that can oxidize and reduce microorganisms to a non-viable state. This technology can also be effective on converting some VOCs (volatile organic compounds) to a less harmful product. The process is analogous to the effect a catalytic converter has on the exhaust gases from gasoline powered automobiles.
Bottom line: Trane Catalytic Air Cleaners, in combination with traditional particulate filtration, can provide improved indoor air quality without the potential high pressure drop and motor horsepower penalties of other air cleaning options like activated carbon filtration.
Trane Catalytic Air Cleaners are available in a variety of configurations:
Gas heat can be a good heating option for climates and applications with large heat loads, applications with high outside air requirements to comply with ASHRAE Standard 62, buildings without a central boiler plant, remote locations where boiler capacity or water piping expense is prohibitive, and areas with relatively inexpensive natural gas or expensive electricity. It can be an economical source of heat when compared to traditional sources of heating such as central plant boilers with hot water or steam coils installed inside air handlers, or electric resistance heating installed inside air handlers.
Trane gas heat option uses indirect heat exchangers and is designed for recirculation or 100 percent outside air applications. Top-quality components in the cabinet, heat exchanger and burner means extended equipment life, even in make-up air applications.
Gas Heat Features
Traq™ airflow monitoring systems are factory-mounted low-leak dampers that modulate and measure airflow. Traq dampers are located in the mixing box module and include Trane's patented and industry-proven flow ring technology that accurately measures airflow. Traq dampers can be controlled with the Tracer™ Summit system or any other building management system.
A split dehumidification unit (SDU) is a dual-path, return-air-bypass air handler. It consists of two units that are stacked together in a draw-thru arrangement and that share one supply fan. All of the ventilation (outdoor) air is ducted to the upper unit where it is dehumidified, typically down to 50 degrees F or lower.
The lower unit is sized to handle the return air needed to achieve the desired air-change rate in the space. The warmer return air in the lower unit mixes with the cooler, drier air from the upper unit. The resulting mixed air provides humidity control by achieving a sensible heat ratio (SHR) of down to 0.4, but also provides sensible reheat without using any new energy.
ASHRAE Standard 62.1 suggests maintaining a relative humidity of no less than 30 percent to provide a comfortable, healthy indoor environment. Trane humidifier modules use low-pressure steam distributors to add moisture to the air. They include accessories such as valves, strainers, and traps. Factory mounting within the air handler lowers the installed cost of the humidifier and keeps moisture out of the supply duct.
Conventional preheat systems are subject to coil freeze-up, stratification, and air-volume variation. Integral face-and-bypass (IFB) coils are specifically designed to minimize these problems, alternating heating and bypass channels with face-and-bypass dampers before and after the coil. If heat is needed, both dampers modulate open; otherwise, they remain closed to prevent "coil wiping" on the leaving side of the coil and to avoid unwanted heat pickup. This design effectively provides good freeze protection, constant airflow, and uniformly mixed and unstratified air.
The IFB coil comes as a complete package (including heating coil, linkage, and dampers), thus assuring maximum system reliability.
The Trane electric heat offering is a factory-installed, UL-listed option for constant-volume or variable-air-volume (VAV) applications. It is a relatively inexpensive first cost heating option compared to central plant boiler systems.
Air-to-air, fixed-plate heat exchangers are used for two separate
applications - energy recovery and dehumidification.
In this application, the air-to-air, fixed-plate heat exchanger is usually used to recover sensible energy. It is more cost-effective in smaller units (less than 10,000 cfm). It is also used in cases where cross-flow issues are critical. The exchanger preheats the supply air during winter and precools the supply air during summer.
In this application, the air-to-air, fixed-plate heat exchanger is used to create a dedicated, 100 percent outdoor-air unit that provides dehumidified ventilation air to a space at room-neutral temperature. It is used in conjunction with additional recirculating air handlers or fan-coil units that handle the sensible cooling load at the space. It is also used where the ventilation cooling load accounts for the majority of the system cooling load, and in humid environments where comfort and moisture control are the primary concerns.
Air-to-Air, Fixed-Plate Heat Exchanger Features
As global energy concerns increase, so does the role of energy recovery systems. Trane offers a number of high-performance solutions for airside energy recovery, including ARI 1060-certified total energy recovery wheels, air-to-air, fixed-plate heat exchangers, and runaround coil loops.
Trane total energy wheel transfers both sensible and latent energy between airstreams. This type of application is used to recover energy and moisture from the exhaust air stream. The wheel preheats and humidifies the supply air during the winter season, and precools and dehumidifies the supply air during the summer season. As the return air enters the unit, a portion is recirculated through the return-air damper, and the remainder goes through the wheel and is exhausted to maintain the required building pressure. Outdoor air enters an outdoor-air damper, then goes through the wheel and mixes with return air. During the economizing mode, the energy wheel is not used, and both wheel bypass dampers are open to allow up to 100 percent outdoor and exhaust airflow.