Breaking News
Comments
Oldest First | Newest First | Threaded View
chanj0
User Rank
Manager
re: Smart-city technology harvests energy from footsteps
chanj0   4/23/2013 7:11:02 AM
NO RATINGS
Great idea! Questions are whether 5mm is noticeable to people who walk on it. Will it cause any imbalance to some people? If it does, it might become a liability. Nonetheless, the idea is definitely worth exploring. Who knows, maybe after a couple generation, if not this first generation, will become part of the power source of our daily lives.

dnh
User Rank
Rookie
re: Smart-city technology harvests energy from footsteps
dnh   4/24/2013 12:47:06 AM
NO RATINGS
I would like to see numbers for the energy that can be harvested, and the capital costs needed. The article is muddled: " 8 watts of kinetic energy can be converted over the duration of each footstep" Watt is a unit of power, not energy. I did a similar calculation myself recently. I work out on a stationary bike that shows the power that I expend. I typically work out for 15 minutes at 100W power. The energy expended is 0.1KW * 0.25 Hours = 0.025 KWH, which is worth about $0.0025 at the current retail price for electricity, assuming 100% of the energy could be converted to electricity. That is very little value. And it is a fairly intence work out - much more intense than walking. And that raises the question that was previously asked - what will be the effect on the walker? My guess is that if more than a couple of watts or so of energy is harvested from a single walker, people will start to complain or will find a less tiring route to walk.

eewiz
User Rank
CEO
re: Smart-city technology harvests energy from footsteps
eewiz   4/28/2013 10:56:58 AM
NO RATINGS
spot on.. they convert human energy to electrical energy. to walk on this floor one need to consume more energy as food than what he is used to now. again, after 1 hour of moderate workout at the gym, i spend like ~400 calories , which converts to just 0.000464888889 kilowatt hours. assuming a 20% conversion efficiency for piezo crystals, the numbers will be abysmal. also this is not the first time this is being tried.. they tried this in tokyo/israel http://www.greenoptimistic.com/2009/10/06/israel-piezoelectric-highway/#.UX0APrX-HOE http://inhabitat.com/tokyo-subway-stations-get-piezoelectric-floors/



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

How to Fly Without Catching the Dreaded Lurgy?
Max Maxfield
19 comments
I am currently not wearing my happy face. In fact, I am a "poorly soldier," as my mother would say when I was a little lad.

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
19 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
45 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)