Talk:Heat transfer

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[edit] Peer Review

Peer review Heat transfer has had a peer review by Wikipedia editors which is now archived. It may contain ideas you can use to improve this article.

I've requested a peer review because I think that this article meets several of the Wikipedia criteria for becoming a featured article. I believe that this article is consise, covers the topic completely, is stable, and contains minimal point-of-view influence. I believe that this article describes a very complicated topic elegantly, and may be useful for both engineers and people with no engineering knowledge. If you agree that this article is a good candidate for becoming a featured article, please let me know. Otherwise, all of use who have worked on this article would appreciate your comments and edits.

Thank you,

-Âme Errante 10:15, 29 July 2006 (UTC)

The link "Heat Transfer Links - Heat Transfer Links" located in the domian onesmartclick.com is nothing more than a page filled with Google advertisements. I would guess that someone edited it into this article to make money off people clicking that link. I'm removing the offending link. Jason 18:16, 1 May 2006 (UTC)

[edit] References

I´ve been doing some search for information in this subject and found a couple of available textbooks on the internet that will surely be usefull for expanding and also refining the concepts of heat transfer.

Please look at:

A Heat Transfer Textbook, John H. Lienhard V, Professor, Massachusetts Institute of Technology.

Wolverine Engineering Data Book II, Dr. K.J. Bell and A.C. Mueller:

Wolverine Engineering Data Book III, Pr. John R. Thome:

Please comment what you think. WiKimik 19:39, 6 September 2006 (UTC)

[edit] Don't confuse heat with energy

I removed the following statement from the intro paragraph:

energy in the form of heat,

because this is a misnomer. Heat is not, in fact, a type of energy; rather, heat is movement of energy (see the first sentance of the heat article). In reality, heat transfer is redundent: the transfer of the transfer of energy. A better name would perhaps be 'thermal transfer' in that one is transfering thermal energy.

of course it is energy, check the units in any equation using heat(q).
BTW the heat article is also wrong, i don't know where this idea started, as a physicist with 20 years kicking around science, wikipedia is the first place i've heard of it, this is very basic stuff to be getting this badly wrong.

"Now although ice has a "rigid" crystalline form, its temperature can change-ice has heat. If we wish, we can change the amount of heat. What is the heat in the case of ice? The atoms are not standing still. They are jiggling and vibrating."

Feynman lectures on physics, chapter 1, lecture 1

Asplace 17:12, 5 February 2007 (UTC)

Of course it's a misnomer. Heat Transfer is the name given to the study of heat. Heat is a transfer of energy. The term "Heat Transfer" IS redundant. Heat is thermodynamically equivalent to work and has units of energy per time. Feynman is wrong, but Newton had it wrong too. Jean Baptiste Joseph Fourier was the first person to separate the concepts of heat and temperature. (A couple hundred years after Newton but a couple hundred years before Feynman.)

Combined with Heat? Maybe it could stay separate as the engineering subject that considers heat, and the Heat article can remain more physics-based?

The entire page should be deleted and combined with heat. As state above, heat transfer is a misnomer. Then why have a page entitled "Heat Transfer"? Makes no sense.

Norm

Norm, I disagree that this page should be deleted. The field of heat transfer may be misnamed (as are, I'm sure, many older areas of engineering and science), but it is nonetheless an applied field separate from the study of heat in physics. As long as engineering textbooks continue to be written about heat transfer, I propose we keep the article. -Âme Errante (talk) 19:11, 7 May 2008 (UTC)

[edit] What about phase change? / boiling heat transfer

Any serious treatment of heat transfer can not ignore phase change. Kjlgstp 14:27, 29 November 2006 (UTC)

Apropos the above - we need a decent article on boiling heat transfer - it's scattered around several places at present. I've bunged down a few thoughts and quotes from standard texts but much more is needed. Bob aka Linuxlad 18:58, 24 April 2007 (UTC)

[edit] Major problems with this article

transferring thermal energy from cold to hot is ok, (heat pumps), its only when no work is added, as in conductive, radiative and convective transfers that heat cannot, overall, move to a higher temperature.

also this article says heat transfer is by electrons and phonons only, if this were the case gases could not be conductors, missed out is heat carrying diffusion of any particles (atoms, molecules) in the system.

Asplace 03:09, 2 February 2007 (UTC)

Asplace, I think that your statement above, 'transferring thermal energy from cold to hot is ok', is wrong. Heat pumps do not transfer energy this way, and even with additional work it is impossible. For instance, the heat pump article states about refrigerators that 'In such a system it is essential that the refrigerant reaches a sufficiently high temperature when compressed, since the second law of thermodynamics prevents heat from flowing from a cold fluid to a hot heat sink. Similarly, the fluid must reach a sufficiently low temperature when allowed to expand, or heat cannot flow from the cold region into the fluid. In particular, the pressure difference must be great enough for the fluid to condense at the hot side and still evaporate in the lower pressure region at the cold side.' Thus, the work applied actually changes the temperature of the refrigerant by exploiting its physical properties, and at both sides energy still transfers from hot to cold. It's a subtle point, but it's very important in engineering. As for your second point, you're right on, and I believe this has since been changed. -Âme Errante (talk) 19:07, 7 May 2008 (UTC)

[edit]  ????What about liquid non-metals????also, read the first and second sentences regarding gas????

Someone posted this in the article. Assuming it wasn't vandalism, can someone comment on it or add something to the article? I've repressed most of what I learned in thermodynamics, and I'm much happier for it.-- joshschr (talk) 21:11, 16 November 2007 (UTC)