Category Archives: Engineering

Ventless Clothes Dryers

Ventless Washer Dryer

Ventless Clothes Dryers

Engineers have provided an alternative to the normal cloths dryer that requires venting. This can come in handy in some apartments that don’t offer a good location for a dryer that also provide an easy venting option. How does such a dryer work:

Ordinary dryers suck in cool, dry air from the room, heat it, blow it through the clothes, and then discharge the damp, hot air outside through a vent. This dryer, on the other hand, runs the exhaust through a heat-exchange system to cool it. Cold water flows through the heat exchanger, absorbing heat from the air. As the air cools, the moisture in it condenses and runs down the drain (along with the used cooling water); the dry air is then heated again, sent back through the clothes, and the cycle continues.

There are even dryers that dry clothes in the same compartment they are washed in, photo: EdgeStar Ventless 110 Volt Combo Washer Dryer.

More details from: What is a ‘condenser’ dryer?

Re-engineered Wheelchair

photo of new wheelchair

Wheelchairs given design makeover by Geoff Adams-Spink, BBC News

Five years later – a development phase that Mr Spindle describes as “extremely difficult” – Trekinetic chose the Mobility Roadshow to unveil a radical new design.

The K2 has three wheels – two large ones at the front that can take mountain bike tyres – and a smaller one at the back.

The company says it is ideally suited for off-road use but can be just as useful in towns and cities too.

Manufacturers of the wheelchair: Trekinetic. They seem to be getting a bit too much publicity, when I visited I received the following: “This account has exceeded it’s bandwidth quota and has been temporarily disabled.” I would imagine it will be available again shortly.

Science and Engineering Podcasts

Engines Of Our Ingenuity hosted by John Lienhard, University of Houston’s College of Engineering, (podcasts via NPR).

A complete history, with transcripts and audio of the over 2,000 episodes, is online – episodes include:

This is a great resource. “The Engines of Our Ingenuity tells the story of how our culture is formed by human creativity. he program uses the record of history to reveal the way art, technology, and ideas have shaped us.”

More NPR Technology podcasts

Recharge Batteries in Seconds

MIT researchers are working on battery technology based on capacitor technology and nanotechnology.

Super Battery (video also available):

Rechargable and disposable batteries use a chemical reaction to produce energy. “That’s an effective way to store a large amount of energy,” he says, “but the problem is that after many charges and discharges … the battery loses capacity to the point where the user has to discard it.”

But capacitors contain energy as an electric field of charged particles created by two metal electrodes. Capacitors charge faster and last longer than normal batteries. The problem is that storage capacity is proportional to the surface area of the battery’s electrodes, so even today’s most powerful capacitors hold 25 times less energy than similarly sized standard chemical batteries.

The researchers solved this by covering the electrodes with millions of tiny filaments called nanotubes.
…
This technology has broad practical possibilities, affecting any device that requires a battery. Schindall says, “Small devices such as hearing aids that could be more quickly recharged where the batteries wouldn’t wear out; up to larger devices such as automobiles where you could regeneratively re-use the energy of motion and therefore improve the energy efficiency and fuel economy.”

Previous post: MIT Energy Storage Using Carbon Nanotubes

Strawjet: Invention of the Year, 2006

Invent Now 2006 Modern Marvel of the Year (links all broken by History Channel, so links were removed, – when will we finally have people in charge of websites that understand basic usability fundamentals?):

The Strawjet is a farm implement that processes straw (wheat, flax, sunflower, tobacco, hemp, etc.) in the field (after the plant has been harvested) into a mat, similar to a large bamboo window blind. This is used to construct composite building panels in much the same way as fiberglass or carbon fiber; however, the Strawjet uses a binder made from paper pulp, clay and cement rather than plastic resin.

Update, 2013: strawjet.com. Also I added this webcast from 2009

Read (except they broke all the links so you can’t) about more finalists in the History Channel and Invent Now Inventor contest:

  • Dr. David L. Cull, Hemoaccess Valve System
  • Kristin A. Hrabar, Illuminated Nutdriver
  • Dr. Sundaresan Jayaraman, Wearable Motherboard (Smart Shirt)
  • Robert C. Kelly, Resc-hue Lite Line

Related: Pay as You Go Solar in India – Appropriate Technology: Solar Water in Poor Cairo Neighborhoods – Lemelson-MIT 2010 Award for Sustainability – Play pumps had the idea of putting a merry-go-round on the site and letting children playing on it provide the energy… The solution does not appear to have been executed well.

Engineering Education Program for k-12

Student Visit to Pratt & Whitney

Project Lead the Way “a national program forming partnerships among Public Schools, Higher Education Institutions and the Private Sector to increase the quantity and quality of engineers and engineering technologists graduating from our education system.”

Photo – Twenty-seven Berlin High School engineering students recently toured Pratt & Whitney’s East Hartford facility. The students were given an overview of how jet engines are made and then toured the Turbine Module Center to learn about the company’s design and machining operations. more

Program puts forward spin on engineering by Jamaal Abdul-Alim:

For one class project, Brown had to design a dwelling that can keep people warm in subzero temperatures and withstand some of the most ferocious winds. Brown says such assignments have given him a whole new appreciation for what it takes to make things work.

“I realize how much work it takes to put this stuff together,” he said.

I seem to be running across a good deal of k-12 engineering education material that looks promising. Hopefully this is more than just random chance and more good news is around to be found.

Related:

k-12 Engineering Education

Presentation by Ioannis Miaoulis, President and Director of the Museum of Science, Boston on k-12 Engineering Education.

Massachusetts was the first state in the nation to include Engineering as a topic in its Learning Standards.

Public schools from pre-kindergarten to high school are now including engineering as a new discipline. Dr. Miaoulis describes the value of including Engineering in the formal curriculum content for elementary, middle school and high school level. He also discusses the necessary partnerships between the state Department of Education, federal government, school districts, teacher groups, colleges, universities and museums and industry that are supporting this effort and the evolution of the program.

$100 Laptops for the World

$100 Laptop from MIT OLPC project

The MIT Media Lab is developing a $100 laptop to provide affordable and appropriate technology to all parts of the world. One Laptop per Child is a non-profit created to pursue this project (which is independent of MIT).

What is the $100 Laptop, really?
The proposed $100 machine will be a Linux-based, with a dual-mode display—both a full-color, transmissive DVD mode, and a second display option that is black and white reflective and sunlight-readable at 3× the resolution. The laptop will have a 500MHz processor and 128MB of DRAM, with 500MB of Flash memory; it will not have a hard disk, but it will have four USB ports. The laptops will have wireless broadband that, among other things, allows them to work as a mesh network; each laptop will be able to talk to its nearest neighbors, creating an ad hoc, local area network. The laptops will use innovative power (including wind-up) and will be able to do most everything except store huge amounts of data.

This is another wonderful example of engineering a better world. The challenges are still large. Making such an audacious plan work will not be easy but if they pull it off the potential benefits are enormous.

UN debut for $100 laptop for poor by Jo Twist, BBC News

Our $100 laptops will run on human power, Rediff

Olin Engineering Education Experiment

Excellent article: The Olin Experiment by Erico Guizzo:

Founded with more than US $460 million from the F.W. Olin Foundation, the school, which will graduate its first class at the end of this month, was conceived as perhaps the most ambitious experiment in engineering education in the past several decades. Olin’s aim is to flip over the traditional “theory first, practice later” model and make students plunge into hands-on engineering projects starting on day one. Instead of theory-heavy lectures, segregated disciplines, and individual efforts, Olin champions design exercises, interdisciplinary studies, and teamwork.

And if the curriculum is innovative, the school itself is hardly a traditional place: it doesn’t have separate academic departments, professors don’t get tenured, and students don’t pay tuition – every one of them gets a $130 000 scholarship for the four years of study.

Find out more about the Franklin W. Olin College of Engineering.

Building a Better Engineer by David Wessel:

To a visitor, the school resembles any other small college. What’s different about it is its almost messianic mission: to change the way engineers are educated in the U.S. so that they can help the U.S. compete in a global economy with lots of smart, ambitious engineers in China, India and elsewhere. “If they become another good engineering school, they will have failed,” says Woodie Flowers, an MIT professor advising Olin. “The issue is to do it differently enough and to do it in way that will be exportable” to other colleges.

We share more thoughts on Olin’s efforts to improve engineering education on our other blog.

Harvard Elevates Engineering Profile

Harvard is planing to move engineering education to the Harvard School of Engineering and Applied Sciences within the Faculty of Arts and Sciences (via Engineering is Becoming a Liberal Art).

The Technology Mosaic by David Epstein:

as Paul S. Peercy, dean of engineering at the University of Wisconsin and chair of the Engineering Dean’s Council at the American Society for Engineering Education put it: “I used to say, ‘look around, everything except the plants are engineered.’ Now I say, ‘look around, everything and some of the plants are engineered.’”

From Harvard’s announcement:

President Lawrence H. Summers. “It marks our recognition of the profound importance of technology and applied sciences for every aspect of our society. It makes visible our commitment to major new resources and faculty positions in this vital area, and our dedication to educating a new generation of technologically-literate students.

In order to provide adequate coverage of modern engineering and applied science for students and to be in the vanguard of emerging research areas, the school plans to increase the university’s engineering and applied sciences faculty by about 50 percent in the coming years.