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Heat Management

     
 

Heatpipes

 
     
Heatpipes: Sinter Heatpipes: Groove Heatpipes: Mesh
Heatpipe Sinter Heatpipe Goove Heatpipe Mesh
Heatpipes: Copper plated or
Anti-oxidation layer
Heatpipes: Copper, nickel Heatpipes: Copper, nickel

     
Custumised Products Heatpipe Bending Service 3-D Heatdiffuser
Heatpipe vierkant Heatpipe gebogen Heatdifuser
Heatpipes: Cross section / surface as desired Heatpipes: delivery curved heatpipes Heatdiffuser: according to customer drawings,
simulation possible
     

Heat Pipes

So called high temperature heat pipes contain alkali metals that function as the best heat transfer media according to merit number. External conditions form the greatest dependency when choosing the cooling medium. By means of capillary action, the liquid now flows through a sintered inner coating, a wire mesh or a groove structure and transports the heat away to the heat sink. The internal structure consists mainly of sinter capillaries, which are very tolerant to bends and can also operate almost independently of gravity. With so-called non-capillary Heat Pipes, the efficiency depends on the vertical installation position. Of course, the material of which the Heat Pipe is made is also decisive, because not all materials are equally suitable in combination with each other. In the lower temperature range, heat pipes are usually made of copper because the material has a high thermal conductivity - it is also easily cold-formed, corrosion-resistant and long-term stable. In rare cases stainless steel is used, but this is more complex to process due to the material properties. High-temperature Heat Pipes are made of heat-resistant steels or nickel-based alloys.

Heat Pipes can be used in a wide range of applications. They are used, for example, in the construction industry, in computer and automotive technology, in chemistry and mechanical engineering, and even in space travel. Wherever it is necessary to dissipate heat to protect components.

We are specialized in putting together the best possible cooling system for your project. We attach great importance to the wishes of our customers down to the smallest detail. Thanks to our Heat Pipe bending service, we are able to adapt individual elements to suit your needs.

Heat-Pipe: construction & operation of  Heat Pipe

Heat Pipe Heat Sink

Effectiveness and Efficiency - Heat Pipes achieve amazing results in thermal management and are an essential part of it. If Heat Pipes are combined to a heat sink by appropriate procedures, not only the use in numerous application areas is ensured, but the cooling capacity is optimized many times over. The heat is efficiently dissipated from hot spots and a Heat Pipe heat sink is also predestined for use in limited installation environments. The combination of Heat Pipes and heat sinks allows a greater and variable distance. These components are expandable with a variety of manufacturing components.

Heat sinks are heat exchangers which exist in various sizes and shapes. They transfer energy in the form of heat to another medium such as air. This has only a small heat capacity and therefore absorbs only a small amount of energy. For maximum benefit, a surface as large as possible is therefore required in order to be able to release more energy. This effect is increased by so-called fins or ribs. Heat sinks are usually made of copper, aluminium or, in rare cases, silver. Aluminium heat sinks have the advantage that they have a comparatively low weight even with larger components. However, they do not always provide optimum heat conduction. Copper, on the other hand, is heavier, but also much more resistant. A further advantage results from the fact that the metal conducts heat much more effectively. However, the high weight can be problematic in some applications. In combination with Heat Pipes, both aluminium and copper can be used as an interface or fin material to create the optimum individual heat sink.

We offer cooling solutions - tailor-made for your project. For our standard Heat Pipes we are happy to advise you. Of course we also realize individual wishes for you.

Simulation

Heat can be efficiently dissipated with the help of our simulations of Heat Pipes adapted exactly to the project. For optimal planning, thermal systems can be tested for weak points and evaluated within a simulated test environment using a CFD tool (Computational Fluid Dynamics). This step enables enormous cost and time savings in the prototype phase, as these are reduced to a minimum because tests are only carried out in the simulation. This allows the Heat Pipe to be adapted precisely to the requirements before the start of production and complications to be largely avoided.

Depending on the cooling requirements, the shape of heat sinks can vary. Our product range includes a large number of different models, which specifically cover every area of application.

 

Loop Heat Pipes

Loop Heat Pipes are two-phase heat pipes which use capillary action to conduct heat from the hot spot completely passively to a condenser or radiator. Compared to conventional Heat Pipes, loop Heat Pipes offer some advantages. On the one hand, LHPs can bridge very long distances of up to several meters. On the other hand, this type of heat pipe can work completely independent of gravity. This fact opens up many fields of application, for example in space travel. Loop Heat Pipes are used in most communication satellites and cool sensitive electronic components and systems.

The circuit in the system is created by the effect of heat on the evaporator, which heats the liquid inside and causes it to evaporate. The rising pressure causes the liquid to move through the steam pipe in the direction of the heat sink. There it transfers the absorbed heat to the environment, cools down and flows back to the evaporator via a pressure compensation chamber. There are two types of wick in this chamber which build up a capillary effect and ensure that the heated part of the circuit is constantly supplied with liquid.

The advantages of such a system become clear: The necessary technology is simplified by the passive movement of the liquid. The pipes are flexible and bendable and can therefore be laid or processed easily. In addition, heat can be transported over long distances - no matter in which inclined position the circuit is, a flow and a perfect function are given in every position.

The planning of a loop-heat cycle involves considerable effort. We are happy to assist you with our expert knowledge during the implementation of your project.

Compared to loop Heat Pipes, conventional Heat Pipes do not have a continuous circuit with clearly separated components such as evaporator, condenser and expansion tank. Heat Pipes are therefore much more compact in design and can be used even in the smallest of spaces. They ensure efficient heat dissipation and work completely passively. Inside, these tubes are equipped with a copper braid, which results in a capillary effect. As a result, liquids such as distilled water flow under increased pressure from warm to cold and thus contribute to the cooling of sensitive components. The shape of our Heat Pipes is freely selectable and is manufactured according to customer drawings. In addition, care is taken to check the component for possible optimizations and to implement these in consultation with the customer.

A large number of elements (mesh and sinter heat pipes, methanol heat pipes, heat diffusers, Peltier elements, Thermoelectric Generators, Peltier controllers, heat coupling elements, heat conducting paste, heat conducting adhesive, carbon heat conducting foil, silicone discs, aluminium oxide discs, Industry fans, fan grilles, experimental kits and much more ... ) can be found in our online shop!

 

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Why do QUICK-OHM Heat Pipes have premium quality?

Technology:


   Tolerances of the Heat Pipe geometry are low

  • Heat Pipe length
  • Heat Pipe diameter
  • Uniformity of Heat Pipe diameter
  • Uniform sinter internal coating

   Different Heat Pipe materials possible with MOQ
  • E.g. stainless steel Heat Pipes

Safe, highly accurate filling of the Heat Pipes with different working media
  • E.g. also low-temperature versions < 0°C
  • High Temperature Versions with Dowtherm

Long life
  • Tightness through solder- and additive-free welding< 0°C
  • Low diffusion due to production from one material

Nickel plated Heat Pipes
  • Oxidation protection
  • REACH-compliant, depending on working medium
  • Other optics

Heat Pipes with antioxidant coating
  • Oxidation protection against copper oxide
  • REACH-compliant, depending on working medium

service
  • Large selection from stock
  • Reliable fast delivery

special service
  • Delivery of bent Heat Pipes according to customer drawing
  • Simulation and development of complete cooling units with heat sinks (passive silent cooling units)
  • Simulation and development of complete cooling units with heat sink and fan
  • Production and delivery of prototypes, small and large series



10 Important rules for the use of Heat Pipes (heat pipes) 10 important Rules about Heat Pipes


  1. A Heat Pipe contains a system that acts partially as an evaporator of the Heat Pipe liquid (warm location) and partially, elsewhere in the geometry, as a liquid condenser (cooler location). The actual transport medium is the liquid vapour.

  2. Within the Heat Pipe, the temperature is (almost) the same everywhere, even if the (hot) transition surface on the side of the object to be cooled (warm location) has very large temperature differences compared to the (cold) transition surface on the side of the cooling system/heat exchanger (cooler location).

  3. Heat Pipes are components that allow heat to be transported very efficiently and quickly from one warm location to another cooler location. They are therefore sometimes referred to as thermal superconductors. In terms of heat quantity and speed, the heat transport can be up to 100-10,000 times higher compared to a geometrically identical component made of solid copper.

  4. Heat Pipes can also be used to create absolutely evenly tempered workspaces and surfaces.

  5. Decisive for the use of the full capacity of Heat Pipes are the heat transfers, on the one hand from the object to be cooled (warm place) to the end of the Heat Pipe, and on the other hand from the other end of the Heat Pipe to the following cooling system / heat exchanger (cooler place).

  6. The heat transfer at these connection points must be as good as possible. In other words, the heat transfer resistance must be particularly low. It is therefore advisable to procure Heat Pipe systems with integrated connection surfaces for the start of new developments. The worst heat transfer of the entire system from the object to be cooled, the cooling system/heat exchanger, limits its efficiency. A poorly executed thermal connection (with too high a thermal resistance) between the warm location via the heat pipe to the heat exchanger (location) cannot be compensated by a heat pipe, however efficient.

  7. Heat pipes must be operated in the temperature and power range corresponding to their design. Otherwise, the heat transport process will collapse or it will not be able to form in the first place. Depending on the initial conditions (temperature level, temperature difference, heat quantity, time factor, geometry, etc.), the Heat Pipe must have different materials, internal coatings, diameters, lengths, internal media, vacuuming, etc. The Heat Pipe must have different materials, internal coatings, internal diameters, internal diameters, internal media, vacuuming, etc., depending on the initial conditions. Therefore, standardization is extremely difficult.

    - Liquid Heat Pipes can be designed for a temperature range of -263°C to approx. 5,000°C. Depending on the temperature range, the working medium is selected, e.g. hydrogen at extremely low temperatures and sodium at extremely high temperatures. Due to its high evaporation heat, water is preferably used as the working medium. However, it can only be used as a working medium at temperatures of over 0°C.

    - Temperature, temperature difference The power that can be transferred with a heat pipe depends on the working temperature (temperature of the warm place) and the temperature difference between the object to be cooled (warm place and contact surface of the cooling system/heat exchanger (cooler place).

  8. With capillary Heat Pipes (Heat Pipes with special internal coating) of best quality, the installation position has almost no influence on the efficiency.

  9. The efficiency of non-capillary Heat Pipes decreases with the deviation from the vertical mounting position.

  10. Depending on the technology, too small bending radii can damage the inner workings of Heat Pipes. With certain designs, bending is not permitted. Bending of Heat Pipes by very large angles can reduce the efficiency or lead to inefficiency. Here there is an additional dependency on the mounting position.

PDF file: 10 important rules for Heat Pipes - Download