HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
REGISTER   |   LOGIN   |   HELP
News
Electronics & Test

Electronic Component Cooling Solutions Wanted

NO RATINGS
View Comments: Newest First|Oldest First|Threaded View
notarboca
User Rank
Gold
Re: Cooler laptops?
notarboca   6/18/2012 11:34:30 PM
NO RATINGS
You're right; in reference to DARPA's auto analogy above, there has to be a radiator somewhere in the system.

ricardo
User Rank
Silver
Re: Cooler laptops?
ricardo   6/18/2012 7:21:24 PM
NO RATINGS
that talked of BOILING the water at the anode of a large power tube rather than simply circulating water passed it. Boiling removed a lot more heat because of the change of the water (or what ever) to steam.

This is how a heat pipe works.  The speed of heat transfer approaches that of the speed of sound.  You select your heat pipe so that the boiling temperature lies between the hot item and the ambient cooling mass.

The design problems with heat pipes is how to get the heat into them at one end and out the other.

robatnorcross
User Rank
Gold
Re: Cooler laptops?
robatnorcross   6/18/2012 7:01:58 PM
NO RATINGS
Not sure how applicable this is but I seem to remember WAY back in the 60's that there was a white paper by Eimac (the transmitting tube people) that talked of BOILING the water at the anode of a large power tube rather than simply circulating water passed it. Boiling removed a lot more heat because of the change of the water (or what ever) to steam. May be Freon or some similar low boiling point liquid could be used to an advantage.

Also I seem to remember that RCA filled some of their first transistors with toluene to help cool them. I think these were germanium devices.

ricardo
User Rank
Silver
Cooler laptops?
ricardo   6/18/2012 5:59:18 PM
NO RATINGS
There's a basic principle that applies to ALL 'cooling' methods.  To move a certain amount of heat, you must have area x temperature.  If device size is specified, the only way to lose more heat is to have the radiator hotter.  Pressurized Ethylene Glycol allowed smaller radiators because it could much hotter than unpressurized water.

For cooler laptops on laps, you need some external part of the device much hotter than the part that is in contact with your lap.

A more efficient heatsink (lower K/W cooling system) for semiconductors runs HOTTER cos the temperature is closer to the temperature of the working part.  That's how it moves more heat.

These fancy methods only move the heat (and temperature) closer to the external surfaces of the device.  Applies even to forced air cooling as the ambient air is the ultimate 'external surface'.

Greg M. Jung
User Rank
Platinum
Effectiveness
Greg M. Jung   6/17/2012 10:00:58 PM
NO RATINGS
Great idea to take cooling to the next level and embed it into the device up front.  I am eager to see what the measured improvement will eventually be.  Will it be a small incremental improvement or a major paradigm shift in technology? (I think it will eventually become the latter).

Ann R. Thryft
User Rank
Blogger
Hasn't this research already been done?
Ann R. Thryft   6/15/2012 11:52:16 AM
NO RATINGS
DARPA is at it again in low-power energy R&D. The "chips getting smaller and hotter" phenomenon is a longstanding, ongoing industry problem, with cooling solutions always trailing technology-wise. In military apps, it tends to be even worse because of the very high-performance electronics used for apps like signal processing. The efficacy of older forced-air cooling and conduction-cooling techniques used at the system level began reaching practical limits a few years back, when liquid flow-through (LFT) and spray-cooling came into use. Microchannel/microfluid cooling techniques are a subset of LFT, and both board-level and chip-level research has been ongoing in universities and industry, both military and commercial suppliers, for several years. So I wonder why DARPA is now funding this type of research?

Beth Stackpole
User Rank
Blogger
Mining the crowd for design intelligence
Beth Stackpole   6/15/2012 6:52:38 AM
NO RATINGS
This effort seems like it could have far reaching ramifications for a host of different gear, from military equipment all the way through consumer electronics. One thing that strikes me about these different DARPA efforts is how the agency has embraced a level of crowdsourcing or at minimum, idea seeking, from a broader constituency in its efforts to break boundaries on product design and innovation. It will be interesting to see what these efforts unearth by opening up the process to a wider audience.

Partner Zone
Latest Analysis
Eric Chesak created a sensor that can detect clouds, and it can also measure different sources of radiation.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Practicing engineers have not heeded Yoda's words.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Rockwell Automation recently unveiled a new safety relay that can be configured and integrated through existing software to program safety logic in devices.
More:Blogs|News
Design News Webinar Series
3/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
2/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
12/18/2013 Available On Demand
11/20/2013 Available On Demand
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 21 - 25, Creating & Testing Your First RTOS Application Using MQX
SEMESTERS: 1  |  2  |  3  |  4  |  5


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: April 29 - Day 1
Sponsored by maxon precision motors
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service