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Thijs Versloot

Nanophononic metamaterials to boost thermoelectric performance - 0 views

cleantechnica.com/...llars-creating-electricty-heat

technology energy nano

shared by Thijs Versloot on 24 Feb 14 - No Cached
  • Thijs Versloot on 24 Feb 14
     
    Thermoelectric materials can see their performance radically improved via the utilization of an array of 'nanoscale pillars,' according to new research from the University of Colorado Boulder. These tiny pillars, built directly onto the thermoelectric material, will reduce the heat flow through the material by a factor of two while not affecting the electrical flow.
LeopoldS

High-performance bulk thermoelectrics with all-scale hierarchical architectures : Natur... - 1 views

www.nature.com/...nature11439.html

NRG phy

shared by LeopoldS on 09 Oct 12 - No Cached
  • LeopoldS on 09 Oct 12
     
    one more step in the right direction for thermoelectrics ...
jcunha

High-performance shape-engineerable thermoelectric painting - 0 views

www.nature.com/...ncomms13403

technology thermoelectricity paint

shared by jcunha on 28 Nov 16 - No Cached
  • jcunha on 28 Nov 16
     
    Thermoelectric paint allows for harvesting of thermal losses.
ESA ACT

Nanotube Phonon Waveguide - 0 views

scitation.aip.org/...GetabsServlet

NaN technology Thermal_Control

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    We find that the high thermal conductivity of carbon nanotubes remains intact under severe structural deformations while the corresponding electrical resistance and thermoelectric power show compromised responses. Similar robust thermal transport against
Lionel Jacques

Exotic explanation for Pioneer anomaly ruled out - 1 views

physicsworld.com/...-for-pioneer-anomaly-ruled-out

Space Trajectory Pioneer

shared by Lionel Jacques on 18 Apr 12 - No Cached
  • Lionel Jacques on 18 Apr 12
     
    "Given that for both craft electricity is supplied by a radioisotope thermoelectric generator (RTGs) powered by the heat given off by the radioactive decay of plutonium - an energy source that decays exponentially with time - Turyshev and others suggested that the extra acceleration could be caused by thermal radiation being emitted from the craft in a preferred direction. "
LeopoldS

Phys. Rev. Lett. 108, 097403 (2012): Thermoelectrically Pumped Light-Emitting Diodes Op... - 0 views

prl.aps.org/...e097403

Nrg energy led

shared by LeopoldS on 09 Mar 12 - No Cached
  • LeopoldS on 09 Mar 12
     
    Does not seem to be in any way of any use for space but more than 100% efficiency always sounds ...(cool/stupid/ridiculous/ignorant/headline catching...)
johannessimon81

High efficiency solid state heat engine - 0 views

www.parc.com/...ciency-solid-state-engine.html

nrg technology

shared by johannessimon81 on 22 Aug 13 - No Cached
  • johannessimon81 on 22 Aug 13
     
    We discussed this today during coffee. The inventor claims that he claims that a pressure differential can push hydrogen through a proton conductive membrane (thereby stripping off the electrons) which flow through an electric circuit and provide electric power. The type of membrane is fairly similar to that found in a hydrogen fuel cell. If the pressure differential is cause by selective heating this is in essence a heat engine that directly produces electricity. The inventor claims that this could be a high efficiency alternative to thermoelectric devices and could even outperform PV and Sterling engines with an efficiency close to that of fuel cells (e.g., ~60% @ dT=600K). I could not find any scientific publications as the inventor is not affiliated to any University - he has however an impressive number of patents from a very wide field (e.g., the "Super Soaker" squirt gun) and has worked on several NASA and US military projects. His current research seams to be funded by the latter as well. Here are some more links that I found: http://www.theatlantic.com/magazine/archive/2010/11/shooting-for-the-sun/308268/ http://www.johnsonems.com/?q=node/13 http://scholar.google.nl/scholar?q=%22lonnie+g+johnson%22+&btnG=&hl=nl&as_sdt=0%2C5
Thijs Versloot

Word of the day - thermoelectric magnetohydrodynamic flow - 1 views

physics.aps.org/st8

fusion MHD

shared by Thijs Versloot on 10 Dec 13 - No Cached
  • Thijs Versloot on 10 Dec 13
     
    Heat and a magnetic field cause the liquid lithium to swirl rapidly, an effect that could be useful in fusion reactors. With a nice video http://physics.aps.org/assets/eab7d11d-20cd-4c37-ab2c-313729ad8422/video-v1.mp4
jcunha

Interference of thermal waves - Can heat be controlled as waves? - 1 views

phys.org/...can-heat-be-controlled-as.html

technology PHY solid state thermal management science

shared by jcunha on 26 Jun 15 - No Cached
  • jcunha on 26 Jun 15
     
    Imagine a material that only admits thermal conduction for certain temperatures. Martin Maldovan from Georgia Tech holds a tiny thermoelectric device that turns cold on one side when current is applied. Recent research has focused on the possibility of using interference effects in phonon waves to control heat transport in materials. These are exciting news (see Nature Materials paper here http://www.nature.com/nmat/journal/v14/n7/full/nmat4308.html). Heterostructure research lead to outstanding new possibilities when applied to electronic transport (e.g. in quantum well and quantum dots) and to photonics (e.g. Quantum Cascade Laser tunnable lasers). Apparently the time has come to see selective thermal control in this way! Truly exciting!!
Luís F. Simões

Shell energy scenarios to 2050 - 6 views

www.shell.com/...shell_energy_scenarios_2050

energy future forecast politics economy climate_change

shared by Luís F. Simões on 09 Mar 11 - No Cached
  • Luís F. Simões on 09 Mar 11
     
    just in case you were feeling happy and optimistic
  • ...7 more comments...
  • Francesco Biscani on 09 Mar 11
     
    An energy scenario published by an oil company? Allow me to be sceptical...
  • Joris _ on 10 Mar 11
     
    Indeed, Shell is an energy company, not just oil, for some time now ... The two scenarii are, in their approach, dependant of economic and political situation, which is right now impossible to forecast. Reference to Kyoto is surprising, almost out-dated! But overall, I find it rather optimistic at some stages, and probably the timeline (p37-39) is unlikely with recent events.
  • Luís F. Simões on 10 Mar 11
     
    the report was published in 2008, which explains the reference to Kyoto, as the follow-up to it was much more uncertain at that point. The Blueprint scenario is indeed optimistic, but also quite unlikely I'd say. I don't see humanity suddenly becoming so wise and coordinated. Sadly, I see something closer to the Scramble scenario as much more likely to occur.
  • LeopoldS on 12 Mar 11
     
    not an oil company??? please have a look at the percentage of their revenues coming from oil and gas and then compare this with all their other energy activities together and you will see very quickly that it is only window dressing ... they are an oil and gas company ... and nothing more
  • Joris _ on 14 Mar 11
     
    not JUST oil. From a description: "Shell is a global group of energy and petrochemical companies." Of course revenues coming from oil are the biggest, the investment turnover on other energy sources is small for now. Knowing that most of their revenues is from an expendable source, to guarantee their future, they invest elsewhere. They have invested >1b$ in renewable energy, including biofuels. They had the largest wind power business among so-called "oil" companies. Oil only defines what they do "best". As a comparison, some time ago, Apple were selling only computers and now they sell phones. But I would not say Apple is just a phone company.
  • LeopoldS on 14 Mar 11
     
    window dressing only ... e.g. Net cash from operating activities (pre-tax) in 2008: 70 Billion$ net income in 2008: 26 Billion revenues in 2008: 88 Billion Their investments and revenues in renewables don't even show up in their annual financial reports since probably they are under the heading of "marketing" which is already 1.7 Billion $ ... this is what they report on their investments: Capital investment, portfolio actions and business development Capital investment in 2009 was $24 billion. This represents a 26% decrease from 2008, which included over $8 billion in acquisitions, primarily relating to Duvernay Oil Corp. Capital investment included exploration expenditure of $4.5 billion (2008: $11.0 billion). In Abu Dhabi, Shell signed an agreement with Abu Dhabi National Oil Company to extend the GASCO joint venture for a further 20 years. In Australia, Shell and its partners took the final investment decision (FID) for the Gorgon LNG project (Shell share 25%). Gorgon will supply global gas markets to at least 2050, with a capacity of 15 million tonnes (100% basis) of LNG per year and a major carbon capture and storage scheme. Shell has announced a front-end engineering and design study for a floating LNG (FLNG) project, with the potential to deploy these facilities at the Prelude offshore gas discovery in Australia (Shell share 100%). In Australia, Shell confirmed that it has accepted Woodside Petroleum Ltd.'s entitlement offer of new shares at a total cost of $0.8 billion, maintaining its 34.27% share in the company; $0.4 billion was paid in 2009 with the remainder paid in 2010. In Bolivia and Brazil, Shell sold its share in a gas pipeline and in a thermoelectric power plant and its related assets for a total of around $100 million. In Canada, the Government of Alberta and the national government jointly announced their intent to contribute $0.8 billion of funding towards the Quest carbon capture and sequestration project. Quest, which is at the f
  • Joris _ on 14 Mar 11
     
    thanks for the info :) They still have their 50% share in the wind farm in Noordzee (you can see it from ESTEC on a clear day). Look for Shell International Renewables, other subsidiaries and joint-ventures. I guess, the report is about the oil branch. http://sustainabilityreport.shell.com/2009/servicepages/downloads/files/all_shell_sr09.pdf http://www.noordzeewind.nl/
  • LeopoldS on 16 Mar 11
     
    no - its about Shell globally - all Shell .. these participations are just peanuts please read the intro of the CEO in the pdf you linked to: he does not even mention renewables! their entire sustainability strategy is about oil and gas - just making it (look) nicer and environmentally friendlier
  • Joris _ on 16 Mar 11
     
    Fair enough, for me even peanuts are worthy and I am not able to judge. Not all big-profit companies, like Shell, are evil :( Look in the pdf what is in the upstream and downstream you mentionned above. Non-shell sources for examples and more objectivity: http://www.nuon.com/company/Innovative-projects/noordzeewind.jsp http://www.e-energymarket.com/news/single-news/article/ferrari-tops-bahrain-gp-using-shell-biofuel.html thanks.
LeopoldS

Miniaturized power modules for aircraft bodies - 0 views

www.physorg.com/...r-modules-aircraft-bodies.html

power NRG thermoelectricity

shared by LeopoldS on 19 Jun 11 - No Cached
  • LeopoldS on 19 Jun 11
     
    probably not practical for launchers nor for s/c but maybe for suborbital planes? nice idea anyway ...
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