Cleanroom HVAC and Air Handling Equipment

Heat-Pipe Energy Recovery Unit

A finned copper-tube recovery module that bridges adjacent supply and exhaust sections with individually charged circuits and an integral sealed divider.

Hermetically Sealed Copper Circuits
Integral Air-Stream Divider
Up to Eight Tube Rows
Serviceable Finned Faces

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Product Introduction

The heat-pipe energy recovery unit extends individually charged copper circuits through two finned sections located in adjacent supply and exhaust ducts. Working fluid evaporates in the warmer half, travels through each sealed circuit and condenses in the cooler half before returning. An integral metal partition is expanded and sealed around every tube penetration so the two duct sections remain physically divided. Circuit geometry can be arranged for side-by-side horizontal air paths or one stream above the other, with the charge and return path selected for equal seasonal recovery or a preferred heating or cooling duty.

Key Features

Loop-circuit geometry can provide balanced seasonal recovery or favor the selected heating or cooling operating condition.

Copper tube penetrations are mechanically expanded into the integral divider to preserve separation between the two air paths.

Selections up to eight tube rows and multiple aluminum or copper fin densities match available face area and pressure-drop limits.

Accessible fin faces, protective coating options and a dedicated drain section simplify cleaning and wet-side maintenance.

Customer Product Concerns

Heat-pipe recovery depends on the physical relationship between the two ducts, even airflow across the finned faces and suitable drainage and frost protection at the cold section.

Supply and exhaust ducts are often stacked vertically rather than aligned side by side.The divided module can be configured for adjacent horizontal paths or an over-under arrangement with a circuit layout suited to the installed orientation.

High face velocity creates excessive pressure drop and leaves the downstream fan with insufficient reserve.The coil face width, height, row count and fin spacing are selected together to keep velocity and resistance within the ventilation duty.

Wet exhaust deposits and corrosive residue reduce heat transfer at the leading fin edges.Wider fin spacing, accessible faces and an application-compatible fin coating preserve cleanable surface area in demanding exhaust service.

Condensate or frost restricts the cold fin section during low outdoor-temperature operation.A correctly sloped drain pan combined with bypass or preheat control keeps liquid and ice from progressively blocking the face.

Typical Applications

Laboratory exhaust and outdoor-air heat recoveryHospital and healthcare ventilationClean manufacturing make-up airData-center indirect cooling systemsIndustrial process ventilation with separated air streams

Technical Parameters

Representative construction ranges for a divided HVAC heat-pipe recovery module are shown below.

Core Material	Individually charged copper loop heat-pipe circuits with phase-change working fluid and aluminum fins
Panel Thickness	Approximately 230 mm finned core depth in the airflow direction for a typical six-row module
Effective Width	500–3000 mm nominal finned-face width across common modular selections
Maximum Length	Up to 5080 mm active copper-tube length across the module face
Steel Facing Thickness	Approximately 1.5 mm minimum galvanized or stainless frame and air-stream divider
Core Density	8960 kg/m³ copper tube material
Thermal Conductivity	Approximately 385 W/(m·K) for the copper tube wall
Surface Finish	Aluminum fins on copper tubes with optional epoxy or hydrophilic coating and powder-coated casing
Joint Type	Hermetically sealed loop circuits passing through an expanded tube-to-divider joint in a flanged frame
Customization	Available based on the intended application and operating environment.

Available Options

Side-by-side or over-under air-stream arrangementEqual seasonal, heating-optimized or cooling-optimized circuit layoutFour to eight tube rows with aluminum or copper fin selectionsProtective fin coating, bypass damper and condensate drain pan

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