tag:blogger.com,1999:blog-7099702607330311917.post6529846480773620609..comments2017-06-13T08:52:51.866-07:00Comments on Ask the Renewable Engineer: Personal coolingnick pinehttp://www.blogger.com/profile/13030713327322011405noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7099702607330311917.post-52302742922164967622013-07-25T01:08:54.979-07:002013-07-25T01:08:54.979-07:00More...
http://www.nbcnews.com/id/43400428/ns/te...More... <br /><br />http://www.nbcnews.com/id/43400428/ns/technology_and_science-innovation/#.UUQhAnBUOxI<br /><br />Skutterudite thermoelectrics<br /><br />Recently, skutterudite materials have sparked the interest of researchers in search of new thermoelectrics[29] These structures are of the form (Co,Ni,Fe)(P,Sb,As)<br />3 and are cubic with space group Im3. Unfilled, these materials contain voids into which low-coordination ions (usually rare earth elements) can be inserted in order to alter thermal conductivity by producing sources for lattice phonon scattering and decrease thermal conductivity due to the lattice without reducing electrical conductivity.[30] Such qualities make these materials exhibit PGEC behavior.<br /><br />The composition of skutterudites corresponds to the chemical formula LM4X12, where L is a rare earth metal, M a transition metal and X a metalloid, a group V element or pnictogen whose properties lie between those of a metal and nonmetal such as phosphorus, antimony, or arsenic. These materials could be potential in multistage thermoelectric devices as it has been shown that they have ZT>1.0, but their properties are not well known and optimization of their structures is under way.<br /><br />from https://en.wikipedia.org/wiki/Thermoelectric_materials#Skutterudite_thermoelectrics<br /><br />http://virtual.clemson.edu/TMRL/Publications/pdfs/s6_ltrp.pdfnick pinehttps://www.blogger.com/profile/13030713327322011405noreply@blogger.comtag:blogger.com,1999:blog-7099702607330311917.post-64098279125361352822013-07-24T14:41:28.754-07:002013-07-24T14:41:28.754-07:00Gary wrote:
>If you could build one from the g...Gary wrote:<br /><br />>If you could build one from the ground up, what would a good design look like? <br /><br />Peltier devices are improving with new materials, eg skutterites... http://www.academia.edu/467388/Measurements_of_Anisotropy_Thermoelectric_Behaviour_and_multi-Fractal_aspects_of_FeSi_and_of_complex_custom_made_TE_materialsPhase change garments and head sink hats and wooden bead backrests for car seats can also help. And cat litter dehumidification?<br /><br />>I wonder about the delivery of the coolth to only small areas. Is that going to be comfortable.<br /><br />Maybe. We don't want to freeze flesh. <br /><br />>This may be more than a matter of convenience and comfort for people on a small budget and ever hotter heat waves.<br /><br />The Phila Energy Coordinating Agency cites statistics showing that more elderly low-income people die in hot weather...<br /><br />Nicknick pinehttps://www.blogger.com/profile/13030713327322011405noreply@blogger.comtag:blogger.com,1999:blog-7099702607330311917.post-51887343920529359042013-07-24T14:14:08.953-07:002013-07-24T14:14:08.953-07:00Hi,
Actually, googling around, there are a few per...Hi,<br />Actually, googling around, there are a few personal cooling devices/garments out there. But, maybe some room for improvement?<br />GaryGaryhttps://www.blogger.com/profile/04159305838358067511noreply@blogger.comtag:blogger.com,1999:blog-7099702607330311917.post-13096983967913393942013-07-24T13:50:07.035-07:002013-07-24T13:50:07.035-07:00Hi Nick,
A personal cooler is a nice, low energy i...Hi Nick,<br />A personal cooler is a nice, low energy idea. Lots of personal heaters out there, but have not seen any personal coolers.<br /><br />If you could build one from the ground up, what would a good design look like? <br /><br />The one you site looks promising, but I wonder about the delivery of the coolth to only small areas. Is that going to be comfortable.<br /><br />This may be more than a matter of convenience and comfort for people on a small budget and ever hotter heat waves.<br /><br />Seems like a good personal cooler would be a good thing to work on.<br /><br />Gary<br />Garyhttps://www.blogger.com/profile/04159305838358067511noreply@blogger.com