heat pipes

Now really. How do you think anyone can understand what you want to know?

look for www.spcoils.co.uk you will get answer

In the meantime don't touch any pipe you see. You may burn your fingers.

On this forum and others there are two kinds of questions.

Type A - Questions that DO NOT relate to a real situation. The subject is general, non-specific or hypothetical. This type of question does not require specific information and only expects a non-specific (Type A) answer.

Type B - Questions that DO relate to a real situation. The subject is very specific. This type of question should be accompanied by the complete slate of details on which to base the very specific (Type B) answer.

In many cases the person who submits a Type A question ends up rejecting the Type A answer and pushes for a full Type B answer.

In even more cases a person submits, what they intend to be a Type B question but furnish no detail information. They are then upset when they only get a Type A answer.

If "you" want a specific answer to a specific piping question I suggest you provide information such as:
- Pipe size
- Pipe Material
- Pipe wall schedule
- Commodity

- Operating Pressure
- Operating Temp.

- Type and thickmess of Insulation (if any)

- Country of installation
- Piping Code

- Type of plant
- Your training, background and relationship to the subject or situation

ACtually, before posting here, you should always try wikipedia:

http://en.wikipedia.org/wiki/Heat_pipe

These are really neat for applications where you have very small but "chronic" temperature differentials. as you will see.

once you have looked at the wiki stuff and its references, then coming here to ask if anyone has experience with these ( Otherthan that silly bird that used to ob into a glass all day cooled by evaporation )

see this link:

http://physicslearning.colorado.edu/website_new/Common/Print.asp?Topic=4&Subtopic=&SubSubTopic=

milo

Hi Guest,

Heat pipes are used to carry high temp heat from the funace to aother place where the heat is needed at the same temperature as the furnace.

In modern heat pipes which must be placed at a slight upwards angle the transfere medium is a small amount of sodium metal, the pipes are usually made of seamless drawn cobalt bearing stainless steel.

When the bottom end of the pipe is heated in the furnace or combustion chamber the sodium evaporates and migrates towards the higher(cooler) end of the pipe, here the sodium is then cooled to a liquid and returns to the bottom end of the pipe, and in doing so gives off the high heat it contained to the upper end of the pipe. Once the sodium reaches the bottom end of the pipe the proccess is repeated.

This system is often used to heat the hot end of a stirling engine that is used in conjunction with a parabolic mirror ie, solar power!

Spencer.

Hi Guest,

It is always better to post with your name after registration as then we will know which part of world you are based.

As far as HEAT PIPE is concerned,

A Heat pipe is a simple device that can quickly transfer heat from one point to another. They are often referred as 'superconductors' of heat as they possess extraordinary heat transfer capacity and rate with almost no heat loss. A heat pipe acts as high conductance thermal conductor capable of heat transfer rate thousands of time greater than that of the best solid conductor of same dimensions.

Principle of operation of heat pipe:

Heat pipe is a heat transferring device working on the principle of evaporation and condensation cycle. Device is filled with a working fluid, a heat transferring medium. Working fluid evaporate at one end extracting heat from source and dissipates to ambience at condenser end through fins. Condensed liquid is transported back, within heat pipe to evaporator end, repeating infinitely.

Applications of Heat pipe:

- For cooling of Semi-conductor devices like Diodes, Thyristors, IGBTs, in Rectifiers, Inverters, units and modules of electronic assemblies as replacement of bulky heat sinks.

- Cooling of Servers, computers and Laptops (Check the hot air window of your laptop, you'll find fins and that is the condenser end of heat pipe)

- Waste heat recovery in HVACs and de-humidifiers

- Use in Die casting and molding

- Solar energy applications and also in Cryogenics.

Visit : http://www.capri.co.in

Since most have noted that the question had been vague I will just add my interpretation:

Heat pipes can be also called thermal pins. If this is what you had been referring to then go to:

http://www.norenproducts.com/Thermal_Pins/

This company has been supplying the industry for 40 years.

All,

While we're on it, please share specific details of any waste heat recovery projects you've seen that utilized "heat pipes" or any other design. I'm curious what works because my industry (casting) waste a lot of energy.

==================================

Here's the basic info from Guest in post #6.

Heat Pipes - Rapid Heat Transfer – several thousand times faster than a copper rod

A heat pipe is an energy-efficient thermal superconductor – with no moving parts. Heat pipes transfer large amounts of heat energy across a small temperature gradient.

Heat pipes are popular because they enhance the cooling process without consuming any energy. The improvements in performance delivered by heat pipes are effectively free.

A wide range of energy-efficient heat pipe applications

Heat pipes recover waste heat and improve the efficiency of dehumidifiers.

Heat Recovery Reclaiming heat from exhaust air and returning it to the fresh supply stream saves energy and money in a huge range of buildings such as hospitals, swimming pools, supermarkets, schools and colleges, restaurants, and social clubs. In every case, the running cost of the heat pipe heat recovery system is virtually nil, and maintenance is minimal. Dehumidification A wrap-around heat pipe enhances the performance of a dehumidifier and improves the quality of the recycled air. The Heat Pipe provides a more comfortable environment for living and working in applications such as shopping malls, call centres, supermarkets for example. The improvements in efficiency come without any increased running costs from the heat pipe.

markar,

Reach me for further details on heat recovery in HVACs and De-humidifiers.

Kindly visit our company site at www.capri.co.in

or, mail at capriheatpipes@gmail.com

Johnson

Try this:Heat Pipes Technlogy,Inc.

Is one of the most interesting and original idea for a coolant system.-

Hi all,

I agree with Capri explanation.

We manufacture "heat pipes" and "Loop heat pipes" for use in the satellite industries and our design is ESA (European Space Agency) approved. They act as heat exchangers with no moving parts nor pumping needs. The contained cooling medium vaporizes in one extreme of the "pipe" (vaporizer section), goes through the axis portion to the opposite extreme to balance pressure and there liquefies in the "condenser" extreme. The liquid medium flows in the opposite direction by the inner surface by capillary effect, as the tube is internally finned (longitudinal ones).

Kind regards

Hi Kwetz,

Thanks for the encouragement.

Incidentally, we are looking for details on Loop heat pipes. Kindly reach me on capriheatpipes@gmail.com

Samuel Johnson