Letters

Letters 05-23-2016

Examine The Priorities Are you disgusted about closing schools, crumbling roads and bridges, and cuts everywhere? Investigate funding priorities of legislators. In 1985 at the request of President Reagan, Grover Norquist founded Americans for Tax Reform (ATR). For 30 years Norquist asked every federal and state candidate and incumbent to sign the pledge to vote against any increase in taxes. The cost of living has risen significantly since 1985; think houses, cars, health care, college, etc...

Make TC A Community For Children Let’s be that town that invests in children actively getting themselves to school in all of our neighborhoods. Let’s be that town that supports active, healthy, ready-to-learn children in all of our neighborhoods...

Where Are Real Christian Politicians? As a practicing Christian, I was very disappointed with the Rev. Dr. William C. Myers statements concerning the current presidential primaries (May 8). Instead of using the opportunity to share the message of Christ, he focused on Old Testament prophecies. Christ gave us a new commandment: to love one another...

Not A Great Plant Pick As outreach specialist for the Northwest Michigan Invasive Species Network and a citizen concerned about the health of our region’s natural areas, I was disappointed by the recent “Listen to the Local Experts” feature. When asked for their “best native plant pick,” three of the four garden centers referenced non-native plants including myrtle, which is incredibly invasive...

Truth About Plants Your feature, “listen to the local experts” contains an error that is not helpful for the birds and butterflies that try to live in northwest Michigan. Myrtle is not a native plant. The plant is also known as vinca and periwinkle...

Ask the Real Plant Experts This letter is written to express my serious concern about a recent “Listen To Your Local Experts” article where local nurseries suggested their favorite native plant. Three of the four suggested non-native plants and one suggested is an invasive and cause of serious damage to Michigan native plants in the woods. The article is both sad and alarming...

My Plant Picks In last week’s featured article “Listen to the Local Experts,” I was shocked at the responses from the local “experts” to the question about best native plant pick. Of the four “experts” two were completely wrong and one acknowledged that their pick, gingko tree, was from East Asia, only one responded with an excellent native plant, the serviceberry tree...

NOTE: Thank you to TC-based Eagle Eye Drone Service for the cover photo, taken high over Sixth Street in Traverse City.

Home · Articles · News · Features · Piezoelectricity
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Piezoelectricity

Harley L. Sachs - April 12th, 2010
Piezoelectricity: Power under pressure
You probably never heard of piezoelectricity but you have used it if you have an outdoor grill with a push-button igniter. The phenomenon gets its name from the Greek word piezo which means push. Push on a ceramic crystal and you get a spark of electricity which, in the case of your grill or the gas/electric refrigerator in your camper, ignites the propane. It’s a strange phenomenon which may someday become a source of electricity by harnessing the pressure exerted on highways or railway tracks.
This phenomenon was first discovered and described by Pierre and Jacques Curie in 1880. It was then just a laboratory curiosity, but it later found application in microphones, which employ electric energy created by the pressure of sound waves on crystals.

EARLY SONAR
Piezo electricity was utilized in 1917 for submarine detection in World War I. That early form of sonar sent out a chirp or ping that bounced off submerged submarines. Currently, you may have seen the piezoelectrical effect in dance halls where someone stepping on a portion of the floor lights it up.
Now there’s an Israeli company called Innowattech, affiliated with the Technion, the country’s premier engineering university, which plans to use piezoelectric pressure plates built into a highway to generate electricity.
The idea developed at the Technion is to bury piezo plates in a stretch of highway to generate electricity from the pressure as cars pass by. Utilizing the energy of a car’s tires pressing down on the highway does not affect the vehicle’s performance. Of course, to generate a continuous flow, you need a continuous flow of traffic, which can only be found during rush hour.
An alternative is to put the piezo generators under railway ties where train traffic is heavy, like the New York or London subway system, where trains are passing every few minutes and continuous pressure is applied to the rails somewhere in the system.

ENERGY CONVERSION
If you ever watched what the rails do as a freight train passes over them, you may have seen how the portion of the track under the wheels of the cars sinks and the portion between the wheels lifts. Some of that energy can be converted to electricity.
The challenge is to link those brief sparking moments so they produce a continuous flow of current. You can’t get that from your grill igniter, but imagine a whole row of them triggered sequentially. The Innowattech plan is to build piezo generators under an experimental 90-foot strip of highway outside Tel Aviv, preliminary to a later half-mile section of road. The projected production of electricity from the half mile is expected to be about 100 kw of electricity, enough to power about 40 houses.
Cost benefit calculations suggest that electricity generated under a highway would cost between 3 and 10 cents a kilowatt hour, comparable to what is generated by wind energy. Fossil fuels cost about 5 cents per kilowatt and solar about the same.
The highway piezo generators will be buried about one inch below the surface. The generators are to go under asphalt, which is flexible, unlike concrete.

DURABILITY?
That all sounds pretty good, but I wonder how long such an installation will last. Though the piezo material can last 30 years, I haven’t seen a stretch of highway in the United States that can go that long before it develops deep potholes. Maybe the Israeli roads are built better.
Putting the piezo generators under railway ties sounds like a more durable alternative.
You have to give the Israelis credit for coming up with new ideas and innovations. Israel has more Ph.Ds per 100,000 than any other country and produces more patents per 100,000 population. A highway that generates electricity is only one of them. Uri Amit, president of Innowattech, believes piezo generated electricity has a future.
There’s even a plan to light a passageway in a high traffic area in Chicago simply by the pressure of people’s footfalls on a piezo-wired sidewalk!
With all those alternative sources of energy, what next?

Visit the web site www.hu.mtu.edu/~hlsachs where you can listen to two stories, read a third, read reviews, and find links to the publishers of my books.

 
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