ACT - Heat Pipes

ACT - Heat PipesACT - Heat PipesACT - Heat PipesACT - Heat Pipes
There are several types of heat pipes available, including:
  • Vapor chamber: These flat heat pipes are typically used when heat fluxes and high powers are applied to smaller evaporators, as well as for enabling heat flow through very thin devices.
  • Variable conductance: Adding a non-condensable gas (NGS) that mixes with working fluid vapor and a reservoir, creates a Variable Conductance Heat Pipe (VCHP), where the effective thermal conductivity varies with the input power and heat sink conditions.
  • Diode: Diode heat pipes are designed to transfer heat in one direction, and insulate it in the opposite direction.
  • Loop heat pipe (LHP): An LHP is a passive two-phase device that is capable of transferring higher power over longer distances.
Benefits of these devices include:
  • High Thermal Conductivity (10,000 to 100,000 W/m K)
  • Isothermal
  • Passive
  • Low Cost
  • Shock/Vibration tolerant
  • Freeze/thaw tolerant


ACT is one of leading manufacturers and suppliers of heat pipes in the United States. We produce a wide variety of heat pipes, heat sinks and heat pipe assemblies for thermal management of electronics and applications such as LEDs, card chassis, lasers, radar systems and medical systems. Our heat pipes offer a high thermal conductivity range of 10,000 to 100,000 W/m K and excellent shock/vibration and freeze/thaw tolerance. They also provide an extremely cost-effective thermal control system solution.


Heat Pipes which have also be termed heatpipes or even thermal pipes, are used across a wide range of markets and applications, and we’re known for producing high-quality copper heat pipes. In fact, ACT is the only US manufacturer that routinely delivers heat pipes for terrestrial electronics cooling (copper-water), on orbit satellite thermal management (aluminum-ammonia) and high temperature calibration equipment (liquid metal). Navigate through the products section below for more information on any of these highly reliable products.


Figure 1. Illustration of Heat Pipe operation.

heat pipe is a two phase heat transfer device with a very high effective thermal conductivity.  It is a vacuum tight device consisting of an envelope, a working fluid, and a wick structure.  As shown in Figure 1, the heat input vaporizes the liquid working fluid inside the wick in the evaporator section. The saturated vapor, carrying the latent heat of vaporization, flows towards the colder condenser section.  In the condenser, the vapor condenses and gives up its latent heat.  The condensed liquid returns to the evaporator through the wick structure by capillary action.  The phase change processes and two- phase flow circulation continue as long as the temperature gradient between the evaporator and condenser are maintained.


If you are designing a thermal system and simply want to learn more about heat pipes for cooling, use the links in the Operation Section. If you still have questions, contact us and an engineer will be in contact with you.

See a full video and transcription about the basics of heat pipes and their advantages.

More Product Information

Advanced Illumination - BL313 Series Medium Intensity Linear Backlight
  • Pre-Engineered Scalability Enables Customized Emitting Lengths in 2″ Increments to 20″
  • Intense, Diffuse Lighting with 226 kLux at Emitting Surface
  • Multiple Available Wavelengths, Including Visible Monochromatics, Infrared, and White
  • Available Washdown Option for Difficult Environments
  • Can be Applied in Backlighting or Diffuse Front Lighting Geometries

Aligned Vision - ALIGN 4.0 Software
Reimagined from the ground up for Industry 4.0 connectivity, ALIGN 4.0 control software maximizes the productivity and throughput of all Aligned Vision systems.
ALIGN 4.0 is an open-platform software system that helps accelerate operator value-added tasks and enables Industry 4.0 connectivity. ALIGN 4.0 controls the functionality of LASERGUIDE, LASERVISION, and our industry-exclusive full-function remote control devices. The CAD-like action of the ALIGN 4.0 user interface provides operators with immediate access to information they need to perform their jobs.

Aligned Vision - System Components
Provides full control of the fabrication steps
  • Full support of electronic ply books with color graphics
  • Operator advances through steps via “Next” button on device
  • “Next” button automatically initiates LASERVISION inspections (when called for in the electronic recipe)
Replaces tedious interaction with control computer
  • Support of multiple jobs and up to 8 mobile devices on a single computer
  • Step-away time from tool eliminated
  • Real cycle time reductions generated
  • Targets: Repairable, NIST Traceable Certification Stands: Portable, Stock, Custom
  • Wireless Label Printers
  • Barcode Readers
  • LED Matrix Billboards
  • Certification Tools

Luna - POD-201 Polarimeter
  • User calibration function to optimize DOP and SOP accuracies at arbitrary wavelengths and temperatures
  • Real time Poincaré Sphere display, analog voltage output for SOP/DOP/power for ATE integration
  • Data logging of SOP up to 1 billion points
  • Averaged DOP measurement function for scrambled-input measurement

Luna - PDL-201 Polarization Dependent Loss (PDL) Multimeter
  • 30 ms measurement speed
  • Wide wavelength range
  • High PDL accuracy
  • OLED display and analog output

Luna - NRT-2500 Polarization Control Platform
  • Paddles (Set Polarization) - Full polarization control by rotating any of the 5 electro-optic 1⁄4-wave plates to achieve the desired SOP setting with high accuracy, repeatability and resolution.
  • Scrambler - Uniform polarization scrambling with full Poincaré Sphere coverage and user-selectable Rayleigh distribution scrambling rates.
  • Depolarizer - A single-speed, ultrafast random scrambling mode to reduce the degree of polarization (DOP) of the measured signal or to introduce an extremely fast ΔSOP Impulses for lightning simulation and loop testbeds.
  • Spinner - Superfast SOP rotations/scrambling up to 940,000 rad/sec for characterizing the new generation  coherent  PM-QPSK  transceivers.
  • Tracker - Fast, robust, and endless polarization tracking with no dropouts or ‘glitches’.
  • Acquirer - Acquirer is the automated ‘smart’ paddles mode to drive the SOP to maximize or minimize a feedback signal.

Luna - OBR 6200 Series Portable Optical Backscatter Reflectometers
  • Fully portable and rugged OBR
  • Track and analyze return loss (RL) and insertion loss (IL) versus length
  • Measure length and latency with high precision
  • Spatial sampling resolution down to 80 μm
  •  Available with IP65 and MIL-STD certifications

Luna - PXA-1000 Distributed Polarization Crosstalk Analyzer
  • High crosstalk sensitivity
  • High spatial resolution
  • Large fiber measurement range

Luna - OCDR-1000 Optical Coherence Domain Reflectometer
  • Distributed reflectivity measurement
  • Event detectionLarge RL range
  • High spatial resolution
  • Clear identification of large and small peaks enables easier data interpretation

Advanced Cooling Technologies, Inc.

Advanced Cooling Technologies, Inc. (ACT) is a premier thermal management solutions company. Started in 2003 as an R&D company, ACT has grown into a leading manufacturer of thermal management products for diverse industries and applications. Our thermal management designs and products are now deployed in numerous commercial satellites, military vehicles, medical devices, Primary Calibration equipment, and HVAC systems. Read more on how we partner with our customers, and how we can assist you.

Contact Details

Corporate Headquarters

Advanced Cooling Technologies, Inc.

1046 New Holland Avenue

Lancaster, PA 17601-5688

Phone: (717) 295-6061

Fax: (717) 295-6064

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