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Xchanger - Model AA Series -Air Cooled Heat Exchanger for Low Pressure Gas Streams
The AA Series heat exchangers are designed to efficiently cool low pressure gas streams using ambient air, offering an ideal solution for environments with restricted cooling water access. These air-cooled units are equipped with a TEFC 230/460 VAC, 3-phase motor, a robust cooling fan, and an OSHA-compliant fan guard, with options for alternate motors when necessary. Constructed with a galvanized steel exhaust hood and venturi frame, the heat exchangers utilize an aluminum plate-fin core, which is furnace brazed for enhanced durability. The process gas moves horizontally while ambient air flows vertically, ensuring efficient heat dissipation. Applications include aftercooling for Roots type and multistage centrifugal blowers in various systems, such as pneumatic conveying and wastewater aeration. Installation is recommended outdoors or in well-ventilated indoor spaces. Xchanger provides multiple models and uses computer modeling and fan performance databases to optimize heat exchanger performance.
Common Applications
Aftercooling Roots type (rotary-lobe) and multistage centrifugal blowers used in pneumatic conveying, biogas, coal-seam methane, and wastewater aeration systems.
Core Construction
The aluminum plate-fin heat exchanger core is furnace brazed with alternating finned flow channels. Process gas flows in horizontal channels, and ambient cooling air flows upward, through vertical channels. The process stream enters and exits through rectangular aluminum headers, which are welded to the core.
Operational Considerations
The process stream must be filtered to ensure particulate will not obstruct the passages. If necessary, the service side can usually be cleaned with a soapy water wash. The process channels should not be considered cleanable due to their long enclosed flow length.
Installation Considerations
Pulsating flow, such as that produced by rotary lobe blowers should be dampened by a chambered silencer. AA Series heat exchangers dissipate heat from the process stream to the ambient environment. They are designed for outdoor installation. If installed indoors, the area should be very well ventilated.
Performance
Xchanger engineers use a computer model to analyze heat exchanger performance based on the best available engineering practice. A database with fan performance data allows us to select the best fan for the application.
Models
AA-250, AA-400, AA-500, AA-750, AA-1000, AA-1750, AA-2000, AA-2750 & AA-3500.
Special Configurations
Can be found on our Custom Designs page.