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Products For Engineers


Benefits of Heat Pipes for Engineers
Heat pipes have been used successfully in a variety of HVAC design applications over the past 27 years for passive dehumidification  ranging from 2 ton residential units to 230 ton commercial applications. HPT has wrap- around heat pipes, controllable heat pipes, and heat recovery systems. Heat pipe products provide the following benefits:
  • Free precool and reheat
  • No heat added to conditioned space
  • Allows entire system to work more efficiently
  • Increases latent capacity without additional energy consumption
  • Dehumidifies air entering the ductwork. Helps better meet the ASHRAE 62-1999 Standard.
  • No moving parts to break down or wear out
  • Often allows downsizing of entire HVAC systems
  • Helps prevent IAQ problems associated with high humidity
The DHP Series (Dehumidifier Heat Pipes™)
Passive humidity reduction with no moving parts, pumps or additional energy input of any kind. Using the proven Dehumidifier Heat Pipe™ Principle, the DHP typically precools incoming air by 8 to 13°F instantly, allowing the cooling coil to meet the dewpoint faster and with greater efficiency. Condensate removal by the cooling coil is greatly enhanced, often doubled by the heat pipes.
One of the most valuable aspects of heat pipe dehumidification is the fact the process of reheat uses the same heat extracted in the precool section of the heat pipe. Because heat is not added to the conditioned space, it does not have to be removed by the cooling system, as with all active reheat methods such as electric strip reheat or hot gas loops.

Benefits

  • May replace electric strip reheat
  • Passive reheat does not add heat to the conditioned space
  • Uses no pumps or any other mechanical devices
  • Operates without interference of existing circuiting
  • Low pressure drop
  • May allow downsizing of entire A/C system

Dehumidifier Heat Pipes in an HVAC System

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Custom Wrap-Around Heat Pipes
Heat Pipes can be installed on almost any AC unit or air handler, whether at our factory or done on site.
U-Framed Heat Pipes
Ready to be placed as a fitted component in the air handle. This model often provides the simplest and most cost effective method of installation.
Controllable Wrap-Around Heat Pipes
Ideal for controlling supply air temperature.

Energy Recovery Heat Pipes Features

Passive Operation
No energy input is required to operate the Heat Pipes.  When two air streams pass through the Heat Pipes, (one air stream at one end, and another air stream at the other end), the temperature difference between the two air streams activates the Heat Pipes and causes them to exchange heat by “Heat Pipe action”.  Heat Pipe action is a much more powerful heat transfer mechanism than convection flow.  Heat Pipe action utilizes the heat capacity available when the working fluid changes phases, from a liquid to a vapor and back again.

Long Life
There is nothing in the Heat Pipes to wear out! The Heat Pipes are passive. They have no moving parts (unless they come equipped with a bypass damper.) To guard against corrosion, the Heat Pipes can be ordered with a baked epoxy coating or other protective coating. The Heat Pipes are fabricated with a multitude of charged circuits. Under normal operations, there is no reason for these ever to leak. If some inadvertent mechanical damage were to occur on one circuit to cause it to leak, there would be little effect on performance even if the leak was not repaired. Furthermore, because the tubes in Heat Pipe Technology Heat Pipes are copper, leaks can be fixed. Most other Heat Recovery Heat Pipes are fabricated with aluminum tubes which are very difficult to repair.

Isolated Air Streams
Dividing plates to separate the two air streams are an integral part of Heat Pipe Technology Heat Recovery Heat Pipes.  The copper tubes carrying the Heat Pipe working fluid are expanded into the mating holes in the dividing plates assuring an excellent seal to prevent cross contamination.

Minimum Maintenance
Since the Heat Pipes have no moving parts (apart from any dampers), the only maintenance recommended is periodic cleaning. A coil cleaner may be applied for this purpose just as for any cooling coil.

Minimum Size
Heat Recovery Heat Pipes from Heat Pipe Technology take up much less space than other heat recovery schemes. They are also generally more compact than other heat pipes. A six-row heat recovery heat pipe can be fabricated with a thickness of as little as 8 inches.

Summer and Winter
The same Heat Pipe can be used for both summer cooling and winter heat recovery without any changeover mechanism. The temperature difference between the air streams activates the energy recovery. 

Three Configurations of Energy Recovery Heat Pipes:

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A. Over-and-under horizontal air streams with Heat Pipes in a vertical plane
B. Side-by-side vertical air streams with Heat Pipes in a horizontal plane
C. Side-by-side horizontal air streams with Heat Pipes in a vertical plane
Case Summaries archived webinars/presentations

 

Last Updated: Oct. 26, 2011
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