Heat Pipe Basics and Demonstration Video
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- Опубліковано 26 вер 2012
- Check out our new version of this video here: • Heat Pipe Basics and D...
This video from ACT (www.1-act.com) provides a brief, high-level overview of the thermodynamic properties occurring during heat pipe operation. It also provides a real-life visual demonstration of the performance enhancements of heat pipes over copper. A heat pipe consists of a working fluid, a wick structure, and a vacuum-tight containment unit (envelope). The heat input vaporizes the working fluid in liquid form at the wick surface in the evaporator section.
Vapor and its associated latent heat flow toward the colder condenser section, where it condenses, giving up the latent heat. Capillary action then moves the condensed liquid back to the evaporator through the wick structure. Essentially, this operates in the same way as how a sponge soaks up water. Phase-change processes and the two-phase flow circulation in the heat pipe will continue as long as there is a large enough temperature difference between the evaporator and condenser sections. The fluid stops moving if the overall temperature is uniform, but starts back up again as soon as a temperature difference exists. No power source (other than heat) is needed. Heat pipes have a high thermal conductivity (10,000 to 100,000 W/m K).
In some cases, when the heated section is below the cooled section, gravity is used to return the liquid to the evaporator. However, a wick is required when the evaporator is above the condenser on earth. A wick is also used for liquid return if there is no gravity, such as in NASA’s microgravity applications. www.1-act.com/innovations/hea...
For more information about how heat pipes work and the types of working fluids available for custom heat pipe design, visit us here: www.1-act.com.
© 2021 ADVANCED COOLING TECHNOLOGIES, INC. ALL RIGHTS RESERVED - Наука та технологія
Holy shit. That demonstration was amazing. I underestimated how good heat pipes are.
Every tiny part of a computer can go into great detail as to why it works. Everything is done for a purpose, and a very good engineering purpose very often.
me too until i have seen the demonstration.....
This is the best explanation of how heat pipes work that I've found. Great job and thanks.
9yrs later & it's still useful content
Thanks
Great! Just learned how heatpipes work in about 2 minutes ! The last example was great to show how good they cool stuff down!
Great video!
Thank you! 😁👍
beautiful......
HEAT PIPE is a mircle
Awesome demonstration. Heat pipes are a marvel of modern engineering.
Great explanation and demonstration! Thank you!
Wow, that's amazing!
Thanks a lot for the great explanations Sir
Thanks for this video Bro!I just learned something new, Good job!!!
This is awesome explanation. Thanks a lot for the video.
So that is how heat pipes in cpu coolers work, right?
Eugene InLaw exactly how
very well explained...
best explanation ive seen, ty
Cool.
Good video and explanation.
I need some of that paint!
thank you so much for this video
That was really cool!
Amazing!
heat pipe demo is awesome. lucid..
Thank you!
nice demonstration :)
Yeah, science!
thanks dude , i was wondering how it works ... now i know what to do with laptop heatsink modification - nothing :)
You can do a lot with a heat pipe! ; )
What is the liquid that is used in these heat pipes typically? Water?
Water if a common working fluid but it really depends on the application. Check out this page on our website, which goes over working fluids for heat pipes: www.1-act.com/working-fluids/
Hello,
Do know the movement rate of atoms from the cool side to the hot side?
How much fluid is used in this example?
Thank for any information,
keghn
Having different thermal mass can lead to the same result in the experiment.
does this explain why if i tilt a certain laptop 90 degrees on its side, the temps rise quickly to 100 and down to 60 when flat again?
Yes, exactly. When you tilt it, the fluid flows to the cold side by the force of gravity, and thus no longer extracts heat from the processors.
Now do the same demo at 1:13 but in a horizontal orientation. Gravity is providing an advantage in returning the liquid to the evaporator. Does the capillary action of the wicking material completely compensate for this change in orientation?
Hi Mark, Good observation, you are correct that when we initially start the heat pipe demo it is in the gravity assisted orientation. In this orientation the pipe will be able to move additional power compared to against gravity or horizontal. In general, most heat pipes are designed for any orientation operation, using the capillary action to fight the gravity head in adverse orientations. Later in the video, we actually move it back to the cold zone and you’ll notice it is still functioning as a heat pipe in the reverse orientation (fully against gravity). From a design perspective, it is key to understand your transport power requirement and make sure that you can move the full power at worst case orientation. You will simply have additional capacity in more favorable orientations. Feel free to contact us at solutions@1-act.com if you have any other questions.
Ooo dear. I thought they were solid. Sawed mine down hoping I could just shorten them.
Ouch! At least it is harmless fluid inside; just water.
Question.
If you have an electrical component that is operating at 40°C, and you use heat pipes for cooling. What is the typical temperature reduction for the component? I realize there are no doubt variables associated with this, but what is the average temperature reduction using heat pipes? I have never seen the stated anywhere before. Thank you
Hello! With more information, we should be able to provide you with an answer! Feel free to reach out to one of our engineers with details regarding your project: solutions@1-act.com
At the moment, it depends on far too many variables to give a clear answer. A heat pipe won’t inherently reduce the temperature of a component unless it is providing a better thermal path than what is already present. If a heat pipe-based cooling solution is designed properly, a heat pipe will help minimize the thermal resistance between the component and the cooling media which will result in a cooler component. The magnitude of that reduction is dependent on many things and can range from a few degrees to tens of degrees.
Thank you for your question and hope you reach out to us for further conversation!
solutions@1-act.com
Is it possible to make DIY acetone heat pipe without vacuum it first? I have plan to build heat exchanger for DIY solar heater, and need something which will conduct heat, but without too much copper, which is today very expensive.
Thank you in advance for answer.
so many solar heaters are operating under evacuated heat pipe...
What is a typical working fluid, and what material is used as wicking material?
The working fluid varies based on the application. I think this will help you see the various scenarios: www.1-act.com/fluidenvelopewick-compatibility/
So what's better for a CPU ? Some Heatpipes, or a big copper block (literally, a big copper cube) ?
everything inside the copper block doesn't help cooling, since those parts aren't exposed to air.
Cool!
Just posted my youtube of my Rotating Heat Pipe Model made using a Dust Off can. Been thinking that a Rotating Heat Pipe might make a good Window Airconditioner.
If a heat pipe is in an vertical orientation, would you need a still wick need a wick? Have there been any cases where heat pipes are used for geothermal applications?
RalghaHhallas The wick does more than just bring liquid back to the hot end. It also spreads the liquid across the surface at the hot end & ensures that only a thin layer of liquid covers any given part of the pipe. Having a thin liquid layer is important to allow rapid evacuation of the vapor, as well as minimizing the thermal gradient within the liquid itself. There are heat pipes with only partial wicks too, like the stationary vertical design you suggested. There are also oscillating/pulsating heat pipes where the passages are small enough to be blocked by the liquid droplets & the rapid expansion/contraction cycle drives the movement of working fluids instead of using a wick.
Thanks. I more interested in using it in a geothermal application. I did a bit more research I think what I was looking for is a thermosyphon. I working on a feasibility study of utilizing thermosyphons to extract heat for residential heating.
so that's what inside a heat pipe in laptops or if not but similar to it :D thanx :D
ok, let's see the color change on an empty hollow tube vs a hollow tube with liquid.
How exactly do the molecules go through the inner wall? Is it only permeable to gaseous molecules? Why does not water/vapor go through the barrier in the middle of the pipe?
Heat pipes are completely sealed devices; the fluid in liquid or vapor form does not exit the heat pipe. Heat enters/exits via conduction through the wall. On the inside of the pipe, the heat transfer is greatly enhanced by the latent heat of the two-phase transition. At the evaporator section this involves boiling/vaporizing which takes advantage of the fluid’s high latent heat of vaporization and at the condenser section the fluid (in vapor form) gives up it’s latent heat as it condenses back to liquid. You can learn a ton more about heat pipes on our website 1-ACT.com.
Can I fold it like letter V?
What happens if you deny the heat pipe? Will it loose effectiveness or kill it completely?
I have an old GTX 780 that I just noticed the heat pipe system has a dent in one of the tubes. Maybe 1/16th deep in a 1/4” tube (1.5mm in a 6.30mm tube). The card is almost useless but I wanted to give it away to see if someone could use it. If it now has issues, I won’t give it away, since it will be nothing but issues.
@remmik- It depends in the nature of the dent. If there is no puncture to the pipe, the dent doesn’t cause discontinuity to the wick structure, and the dent doesn’t choke the vapor flow, it will likely still operate as a heat pipe. In your case, if there is no puncture, I’d imagine the dent isn’t large enough to render the heat pipe useless if was designed with sufficient margin. To test to see if the heat pipe is working, you can control temperature on one end and see if the other end is similar temperature (note: this should be much different than the ambient temperature). A functioning heat pipe will have a very small temperature gradient whereas a non-working heat pipe will have a much larger temperature gradient.
Hey Im making a small Video About Heatpipes for my physikal Chemistry Class at University. May I use parts from your Video?
Thanks for asking. Yes, you may as long as you credit Advanced Cooling Technologies during the part you select. Thanks again!
Very good explanation. However feel free to use a pop shield and have a glass of water. Perhaps even a few centimetres back from the microphone. It would make your voice with otherwise pleasant characteristics more enjoyable.
+Basil Lange what is the significance of the glass of water?
You know that the surfaces of the mouth can get quite dry after speaking for a while. A nearby microphone picks up those sounds, listening to the video made me very aware of the speaker having a dry mouth. It also smoothens the vocal chords to have a glass of water. Since the tone and manner of speaking is very nice.
Basil Lange
ah, so its just for sipping. i thought it had something to do with soundwave refraction or something.
So, air-coolings on cpu are actually water-coolings ?
Heat pipes are used a heat transport device, leveraging passive two-phase heat transfer. The system still requires some type of ultimate heat sink, which can be air cooled or liquid cooled depending on your system requirement. Heat pipes can make either option more efficient and reliable.
In other words. Yes. Same means, but on a much more massive scale.
Can the copper/water type work in 250~350°C?
Experience from our life tests leads us to recommend the usage of copper/water heat pipes up to 300°C for short-term operation. You can read more here and find a list of compatible materials and recommended temperature ranges. www.1-act.com/resources/heat-pipe-resources/materials/compatibility/#compatible .
What is the point of a heat pipe?
Can a titanium heat pipe generate higher heat ratios?
titanium would make the heatpipe expensive and difficult to produce and it would not make the heatpipe any more efficient because the heat is carried through a liquid vapor.
Threaded oh I see that's a hook up.
very silent, too low volume but video is informative
Could not liquid metal be used with a electromagnetic pump to reach greater temperatures in order to heat hot water and generate electricity? I mean making hot water is great but you could do so much more with this technology! Power poles would not just carry power each one would make it has it moved it to be used in cities. Novartis
So what is the fluid?
Hello - the working fluid choice depends on what the heat pipe is being used for. A copper heat pipe with a water working fluid is very common. Here is a good resource to learn more about working fluid compatibility: www.1-act.com/fluidenvelopewick-compatibility/
Wooow
Does this technically mean heat pipes are phase change cooling?
+Aaron Lowe actually, no. Phase change cooling is characterized by the cooling action being created as a the fluid in the system moves from a high pressue zone to a low pressure zone, becoming a gas in the process.
That said, there is definitely a phase change happening in these heat pipes.
Powered By Redstone Well it's literally changing phases... In all chemistry terms
Absolutely, but in this case, the phase change is not the cause of the cooling action, but instead as a result of the heating action applied to the heat pipe.
True-... It's not exactly refrigeration lol
***** not quite. Phase Change cooling relies on the resulting cooling effect of a compressed gas in liquid form transitioning to a gaseous form by being released through a small orifice, whereas heat pipes cause a phase change by heating a liquid into a gaseous state and carrying the heat away with the gas.
There is a phase change present in both situations, but in a phase change cooler, the phase change is the cause of the cooling, as opposed to a heat pipe, where the phase change is the result.
what type of liquid inside the heat pipe
Mohamed - liquid can vary based on the application. Here is a good piece from our website that explains what working fluids are used when: www.1-act.com/fluidenvelopewick-compatibility
Energy Recovery
The refrigerant R134a is used as the working fluid with copper or steel envelopes in Energy Recovery Heat Pipes Heat Exchangers, since it has no ozone depletion, low global warming -
If it is leakage of heat pipe ,how to reinsert the gas in the HVAC
why the pipe color changed？
There's a temperature-sensitive coating on the heat pipe.
I come because of CPU heatsink
Dont make the inside of your diagram orange. that implies its solid throughout, and not hollow
aren't pipes hollow by definition?
กิตติพล ขาวงาม
Sewer treatment plants could destroy all microbral life and turn the biomass into fertalizer to be used to grow more food rather then just dump the waste water into rivers that all flow our to sea! Nitrogen rich water?
damnit ts water in my pc -_-
OF COURSE - heating and cooling a tube is faster than a rod, that's not a measurement.
You clearly have no idea what's happening.
Dude, get yourself e proper microphone!
Accidentally disliked this trying to like it - forgive me.
No worries, Aldion! :)
Speak up for god sake
wrong, nst as up downx
Great video!
How is the heat transfer if there are 2 heatsources?
Does the cooling capability or power stay the same on the entire length of the pipe?
A heat pipe will isothermalize to however many heat and cooling sources that is connected to it. Because vapor is used to transfer heat, it is very fast, essentially providing uniform heat transfer throughout the pipe. Does that answer your question? Are you working on application that might benefit
from heat pipes?
Advanced Cooling Technologies Inc.
Thank you for the quick answer
So if there are these said two heat sources the temperature stays same at both heatsources if they have the same heating power (W)??
Thanks again didnt expect such a quick answer
The heat pipe will isothermalize all of the inputs and the temperature inside the heat pipe will be 2-5°C. If you need more detailed information, you send us an email via our Contact Us form with the detail and we can get you in touch with the best person to answer your question. www.1-act.com/contact-act/