2215627-2 - Honeywell OEM Secondary Heat Exchanger Diffuser Assembly

2215627-2 – Honeywell OEM Secondary Heat Exchanger Diffuser Assembly

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Overview

The Honeywell 2215627-2 is a flight-critical secondary heat exchanger and diffuser assembly, a core component of the air conditioning pack for the Boeing 737 Next Generation (NG) series of aircraft. This is not a simple radiator; it is a high-performance, plate-fin heat exchanger engineered to operate within the aircraft's Environmental Control System (ECS). The primary function of the 2215627-2 is to perform the second stage of cooling for the hot, high-pressure bleed air from the engines, just before it enters the air cycle machine's compressor. Its integrity and thermal efficiency are fundamental to the performance of the air conditioning system and the safety of cabin pressurization.

Manufactured by Honeywell, a world leader in aerospace environmental systems, this heat exchanger is built from specialized aluminum alloys to provide maximum thermal transfer efficiency at a minimal weight. Its performance is critical for ensuring passenger comfort and the proper function of the entire air conditioning pack.

Key Features

• High-Efficiency Plate-Fin Design: Utilizes a high-density, plate-and-fin construction. This design creates a massive surface area in a compact volume, allowing for extremely efficient thermal energy transfer from the hot bleed air (the "hot side") to the cooling ram air (the "cold side").

• Corrosion-Resistant Aluminum Construction: Fabricated entirely from specialized, vacuum-brazed aluminum alloys. This provides excellent thermal conductivity and is lightweight, while also offering superior resistance to the corrosion and high temperatures of the bleed air system.

• Integrated Diffuser: The assembly includes an integrated diffuser section, which is an aerodynamically shaped duct designed to slow the velocity of the incoming bleed air. This reduction in velocity increases the static pressure and allows for a more uniform flow through the heat exchanger core, maximizing its efficiency.

  
  

  
  

• Structural Integrity: Engineered to withstand the significant thermal stresses of cycling from ambient ground temperatures to several hundred degrees Celsius, as well as the constant high pressures of the bleed air system and the vibrations of flight.

• Genuine OEM Component: As a genuine Honeywell factory unit, it guarantees the correct thermal performance, pressure drop characteristics, and physical fitment required by the aircraft's original Type Certificate.

Technical Specifications

• Part Number: 2215627-2

• Component Type: Secondary Heat Exchanger with Integrated Diffuser

• OEM Manufacturer: Honeywell Aerospace

• Primary Application: Air Conditioning Pack / Environmental Control System (ECS)

• Heat Transfer Type: Air-to-Air (Bleed Air to Ram Air)

• Construction: Vacuum-Brazed, Plate-Fin

• Material: High-Strength, Corrosion-Resistant Aluminum Alloy

• Certification: FAA / EASA Production Approval

Aircraft Compatibility

The 2215627-2 is a key component of the air conditioning packs on the world's most successful narrow-body airliner. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.

• Primary Aircraft Models:

  • Boeing 737 Next Generation: 737-600, -700, -800, -900, -900ER

  • Boeing Business Jet (BBJ)

Why Choose 2215627-2?

The performance of an aircraft's air conditioning and pressurization system is critical for passenger and crew safety and comfort. A leaking or inefficient heat exchanger can lead to an inability to cool the cabin or, in a worst-case scenario, a bleed air leak that triggers a high-temperature warning and a mandatory pack shutdown. Using a genuine Honeywell 2215627-2 is the only way to ensure the component has the certified thermal performance and structural integrity to function reliably in this high-pressure, high-temperature environment.

The Honeywell 2215627-2 secondary heat exchanger is a crucial stage in the air cycle machine (ACM), also known as an "air pack." The process begins with hot (e.g., 200°C), high-pressure bleed air from the engine entering the primary heat exchanger. This pre-cooled air then enters the 2215627-2 secondary heat exchanger for another stage of cooling against cold ram air. This now-cooler, high-pressure air is directed into the compressor side of the ACM, where its pressure and temperature are raised again. The air is then passed through the main heat exchanger one last time before it enters the turbine side of the ACM. As the air rapidly expands through the turbine, it experiences a massive temperature drop due to the ideal gas law (the Brayton cycle), often exiting at temperatures near freezing. This super-chilled air is then mixed with a small amount of warm bleed air to achieve the desired cabin temperature. The efficiency of the 2215627-2 is critical because the colder the air is before it enters the ACM's compressor, the colder it will be when it ultimately exits the turbine, directly impacting the entire system's cooling capacity.

Note: This is a flight-critical, high-temperature, high-pressure system component. Installation, removal, and all maintenance actions must be performed by certified AME or A&P mechanics holding the appropriate ratings and in strict accordance with the current Boeing maintenance manual. All associated clamps and seals must be replaced during installation.