Crispin, cc list 1. The paper I cited (http://cfc.kscia.or.kr/new/wwwboard/admin/wwwboard/attach/1087363006/26.pdf ) was quite clear that he was talking heat pipes. Solar Energy is a respected journal that won’t make a mistake about a term like "heat pipe”. This is definitely a question about a two-phase system. Thermal siphons are usually one-phase.
2. At: http://www.thermomax.com/Downloads/How%20Works.pdf, they say: Due to its thermal-physical properties, its heat transfer rate is thousand's times greater than that of the best solid heat conductor of the same dimensions.” This is what I am after; using a solar site explanation only because I can’t find a better one. The need for a wick is eliminated by using gravity for the return liquid. 3. I am trying to move the discussion away from solar collectors - for reasons of getting more pots active with a single biomass flame. I found there is a journal devoted only to heat pipes - see http://www.dl.begellhouse.com/download/article/2f3e64f4394d33a5/HPST0102%20(151-162).pdf. But this particular article is not what I am contemplating. Ron On Jan 29, 2014, at 9:19 PM, CPP GMail <[email protected]> wrote: > Dear Ron > > I am wondering if the term 'heat pipe' is being used correctly here. I > certainly know what a heat pipe is but the vacuum tube collectors used in > these solar installations are not heat pipes. They are what is described in > the text. > > They are vacuum insulated collectors being used in thermosiphon systems. The > Mercedes cookers used a second thermosiphon to transfer heat from the main > tank. That was not a heat pipe either though using a different working fluid > it certainly could have and it might have solved the heat transfer rate > problem. > > In my view that combination might be the best way to get solar cookers much > more widely used, tackling the institutional market first. It allows the > heart be collected any time, and the cooking to be done later. The heat pipe > is the correct technology to draw the heat to the cooking vessel or surface. > By varying the pressure in the tube the heat transfer rate can be controlled. > > Regards > Crispin > > PS re the firewalled papers: you can write to the author and ask for a copy > and they usually send it. > > > > Crispin and list: > > Thanks for the updated cite. Makes at least two that are not behind > paywalls. Hope we can find some that are even more current and easy > obtainable. But there is a big literature on heat pipes outside the cooking > arena. > > I think we can learn a lot from the solar cooker side - but my interest > is on biomass stoves and the ability to feed multiple pots from a single > flame. You talk also about thermo-siphoning and pumps. I am describing > neither of those - a heat pipe operates on a very different principle as I > know you know. > > The word “diode” is important here. > > I talked with one of the last references in your cite - Mr. C J Swet > at about the time he wrote that 1974 article - on (I recall) a thermo siphon > principle. > > Ron > > > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/ > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/
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