asteroza + heat   349

PowerWatch
Second version now uses both solar and body heat thermal power generation, but now includes GPS which could drain the battery...
solar  body  heat  thermoelectric  watch  smartwatch  hardware  electronics  devices 
4 weeks ago by asteroza
Generating Light from Darkness: Joule
Using narrowband emitters to emit heat through the atmospheric IR window, you can make a plate cold on the sky facing side, creating a heat difference a thermoelectric generator can utilize
narrowband  IR  emitter  surface  treatment  atmospheric  window  heat  differential  night  sky  thermoelectric  generator 
september 2019 by asteroza
Self-sustained biphasic catalytic particle turbulence | Nature Communications
Adding a little hydrofluoroether (HFE) organic solvent to a water based turbulent heater exchanger ups heat transfer 5x because the bubbling action assisted by the HFE pulls new cold liquid to the heat exchanger surface
hydrofluoroether  HFE  turbulent  water  heat  exchanger  cooling  research  technology  transfer  turbulence  active  particle  agitation 
august 2019 by asteroza
Nuclear Propulsion Along Inland Waterways
This is actually an argument in favor of mobile thermal batteries with their heat engines, and a recharging infrastructure (which preferably uses small nuclear heat sources). Fireless steam locomotives are still in use in select industries that use a large steam vessel recharged by an external steam source, but newer thermal batteries could improve on things.
mobile  thermal  battery  energy  storage  marine  propulsion  steam  engine  SMR  nuclear  reactor  heat  source 
july 2019 by asteroza
Numerical investigation of the convection heat transfer driven by airflows in underground tunnels - ScienceDirect
Using subway tunnels as the heat source in a ground source heat pump setup for district heating maybe. I suppose that's one solution to the London Underground overheating problem...
heating  cooling  HVAC  subway  tunnel  ground  source  heat  pump  district 
june 2019 by asteroza
Phys. Rev. B 83, 233404 (2011) - Polarized light emission from individual incandescent carbon nanotubes
10x more intense output from a wire radiator if the wire is shorter than the wavelength, polarize in a specific direction
nanotube  nanowire  wire  radiator  heat  rejection  materials  science  research  technology 
may 2019 by asteroza
Home ~ Celeroton AG - Ultra-high-speed electrical drive systems
Very high speed microturbines, with gas bearings. Also do microcompressors (centrifugal).
microturbine  microcompressor  turbien  compressor  research  technology  heat  pump 
april 2019 by asteroza
Turbo Compressors Enable Lighter Satellites ~ Celeroton AG - Ultra-high-speed electrical drive systems
better than 5kw/kg specific power heat pump using isopentane (roughly 10x better than normal). New compressor designs used in microturbine
microturbine  isopentane  heat  pump  turbine  research  technology  cooling  satellite  space 
april 2019 by asteroza
Material for New-Generation Atomic Reactors Developed in NUST MISIS
New steel-vanadium-steel layered composite might be good for nuclear reactor fuel rod tubes
russia  nuclear  fuel  rod  radiation  heat  resistant  steel  vanadium  composite  alloy  metal  metallurgy  materials  science  research  technology 
march 2019 by asteroza
Saarbrücken research team uses artificial muscles to develop an air conditioner for the future | Universität des Saarlandes
Using nitinol shape memory alloys as the thermal medium/matrix in a thermal wheel rotary air heat exchanger, where the wheel itself is the HVAC system!
rotary  heat  exchanger  thermal  wheel  air  entropy  nitinol  shape  memory  alloy  metal  conditioner  heater  HVAC  mechanical  materials  science  research  technology  cooling  heating 
march 2019 by asteroza
Review of Fractal Heat Exchangers
Interesting bit about fractal design based heat exchangers. Promise less pressure drop
fractal  heat  exchanger  design  cooling  research  technology 
march 2019 by asteroza
Turns heat into clean electricity | Climeon
Some sort of modular waste heat power generator (rankine?)
waste  heat  recovery  low  temperature  power  generator  modular 
march 2019 by asteroza
Aster Thermoacoustics
Interesting work on both thermoacoustic heat sources and matched bidirectional turbines for electrical power generation. Thermoacoustic electrical generators previously used linear alternators, but those prefer faster cycles, which is opposite what the thermoacoustic wants (parts sizing goes up unfavorably when scaling), and slower long stroke linear alternators also have issues (long piston stroke, sealing issues). Using a rectifying bidirectional turbine may be a convenient workaround.
EU  europe  holland  thermoacoustic  research  acoustic  wave  rectifying  bidirectional  turbine  power  generator  cooling  waste  heat  recovery 
february 2019 by asteroza
SoundEnergy – Thermo acoustic cooling technology
Thermoacoustic cooler that uses waste heat to make cold directly, no electricity stage
thermoacoustic  cooler  refridgerator  cooling  waste  heat  recovery 
february 2019 by asteroza
Contactless steam generation and superheating under one sun illumination | Nature Communications
Okay, it's cheating to say one sun when using a concentrator, but switch from direct contact heat transfer with capillary flow to IR emitter and vapor passthru is interesting
carbon  foam  solar  heat  absorber  IR  thermal  emitter  steam  generator  passive  materials  science  research  technology 
december 2018 by asteroza
Treau
Trying to do low temperature delta heat exchangers via cheap polymer membranes
polymer  membrane  low  temperature  heat  exchanger  cooling  materials  science  research  technology 
october 2018 by asteroza
Nelumbo
Some sort of surface treatment for heat exchangers that have condensation, that throws off the droplets
hydrophobic  surface  treatment  condensing  heat  exchanger  materials  science  research  technology 
october 2018 by asteroza
Ceramic–metal composites for heat exchangers in concentrated solar power plants | Nature
New hybrid ceramic for use in heat exchangers. Start with a titanium carbide porous block, immerse in a copper and zirconium bath. The zirconium infiltrates the ceramic and displaces titanium in the carbide, while the titanium migrates into the open pores. Copper ends up being a thin film sealant.
supercritical  CO2  heat  exchanger  PCHE  materials  science  research  technology  titanium  carbide  zirconium  copper 
october 2018 by asteroza
[1802.09463] Exploring the limits of super-Planckian far-field radiative heat transfer using 2D materials
so if two surfaces are closer than the wavelength for radiative heat transfer, interesting things happen
radiative  heat  transfer  physics  materials  science  research  technology 
september 2018 by asteroza
Hundred-fold enhancement in far-field radiative heat transfer over the blackbody limit | Nature
So when the gap between surfaces is 25nm, you can get much higher radiative heat transfer. But if you are that close, why not go conductive?
radiative  heat  transfer  physics  materials  science  research  technology  nanotechnology 
september 2018 by asteroza
Heat Accumulation in Laser-Based Removal of Space Debris | AIAA Journal
Laser brooms for orbital debris may face heating restrictions due to accumulated internal heat, forcing longer ablation campaigns. But, because of this cooling requirement, if you flip that around, it might imply a debris removal campaign may prefer a fast slewing pulse laser to hit any and all debris a laser station can see on every orbital pass. Basically touch everything a little bit, all the chances you get.
space  trash  orbital  debris  removal  laser  broom  sweeper  heat  retention  limit  dwell  time  liquification 
march 2018 by asteroza
Transactions of the Symposium on Space Nuclear Power Systems, (5th) Held at Albuquerque, New Mexico on January 11, 1988. | National Technical Reports Library - NTIS
The PDF contains info on wheelguns, giant counterrotating flywheel hoops in space to supply power to SDI weapons, mainly railguns/particle accelerator cannons/free electron lasers that need huge amounts of power right now. Appears to expect to be trickle charged over time by a small space nuclear reactor (SNAP? atomic teakettle?). Also has an interesting microwave power beaming scenario from a nuke in mars synchronous orbit to a ground rover, high performance radiators, including a fabric heatpipe radiator, a curie point magnetic liquid droplet radiator, and other power conversion concepts.
SDI  wheelgun  space  counterrotating  flywheel  hoop  energy  storage  power  generator  FEL  free  electron  laser  railgun  neutraal  particle  accelerator  cannon  military  WPT  microwave  transmission  mars  MSO  rectenna  rotating  loop  pulsed  fabric  radiator  heat  thermal  management 
march 2018 by asteroza
OSA | Achieving cryogenic temperatures in deep space using a coating
FISO briefing has more, but a pressed powder of BaF2 used for tank coating and thermal standoffs for a LOx tank in space might allow storage of LOx without a crycooler (with the risk of LOx freezing out in deeper space!) due to reradiation
BaF2  heat  rejection  optical  surface  coating  thermal  management  cyrogenic  materials  science  research  technology  tank  space 
january 2018 by asteroza
Tough SF: Liquid Rhenium Solar Thermal Rocket
Interesting solar thermal concept using a liquid primary heat receiver. Needs some work on the solar window end of the barrel design.
space  solar  thermal  propulsion  liquid  metal  heat  receiver 
october 2017 by asteroza
SANDIA PROGRESS ON ADVANCED HEAT EXCHANGERS FOR SCO2 BRAYTON CYCLES
Interesting work on casted metal heat exchangers, which may be cheaper/easier to manufacture than PCHE's for some requirements. Investment casting is simpler, and new fancypants 3D printing of sand cores at high resolution may improve surface finish of the mold.
cast  metal  heat  exchanger  CMHE  PCHE  airfoil  finned  fin  curve  materials  science  research  technology 
september 2017 by asteroza
Microtube Heat Exchanger
Paper from 1991 describing microtube heat exchangers, which if short stacked and pumped up at high pressure, would reduce pressure losses. Possible alternative to PCHE.
microtube  heat  exchanger  research 
september 2017 by asteroza
SkyCool Systems: The future of cooling
Rejecting heat through atmospheric IR windows to space from the ground. Potentially cooling to sub-ambient!
atmospheric  IR  window  heat  rejection  cooling  HVAC 
september 2017 by asteroza
Hybrid thermionic-photovoltaic converter: Applied Physics Letters: Vol 108, No 14
Advanced concept that uses a mix of thermionic and photovoltaic cells to convert high temperature heat to power. Thermionic collects electrons, PV collects protons from a hot surface.
TIPV  hybrid  thermionic  photovoltaic  power  generator  high  temperature  heat  converter  materials  science  research  technology 
august 2017 by asteroza
Mezzo Technologies | Home
Microtube heat exchangers, somewhat similar to REL's SABRE precooler heat exchangers for Skylon...
microtube  heat  exchanger  hardware  research  technology  SABRE  precooler  Skylon 
july 2017 by asteroza
falling-particle receiver – Sandia Energy
some sort of falling sand solar heat receiver, attempting to overcome some molten salt solar receiver limitations
Sandia  falling  particle  solar  thermal  heat  receiver  sand  heatsink  storage 
july 2017 by asteroza
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