36

Because a playground equipped with generators would probably not be much fun. The merry-go-round would grind to a stop the moment it is no longer being pushed. The swings would not swing; they would glide back to their resting place then sit idle. The jungle gym would require children to follow a prescribed exit that could capture their stored gravitational ...


14

A better target would be gym exercise machines Indoors, not exposed to elements, controlled environment so less chance of theft and vandalism. Customers stay on machines for a prolonged period instead of kids who would play on 1 thing for 5 minutes or less before moving on to the next one Arrays of identical machines can be connected to same grid tie ...


11

Playground equipment is very expensive and not typically something that local councils have large budgets for. Hooking it up to the electrical grid for minor amounts of electricity generation would increase the cost substantially and require an ongoing electrical maintenance contract.


5

There are two main areas to consider here: Safety. Anything put near children has to be safe, and mains voltage and generators generally aren't. Damaged wires could electrocute somebody, a generator rotor could kick back, injuring a kid. Durability A regular playground will be used in every possible unintended way, and there will be often damages. Not a ...


4

I think you have exactly the right term already. The Institute of Electrical Engineers use "gravity energy storage" and wikipedia has a Gravity Battery page. The main issue is that pumping and storing huge amounts of water is a mature technology - people have been doing that for ages. And since gravity isn't very energy dense storing decent amounts ...


3

It's a matter of energy density. Compared to lithium-ion batteries, compressed hydrogen gas stores about 150 times as much energy per kilogram, or twice as much energy per liter. If you're using the energy immediately after generating it, then yes, direct power makes sense. But if you're storing it for later, or need to use it to power something that can't ...


2

They do.) Just to show how small power such generator can produce. In the picture bicycle generators that convert mechanical power into different types of power are shown, they're located near Municipality of Jerusalem.


2

My brother is a bicycle fanatic, a former engineer, and a current nurse. According to his calculations ... Lance Armstrong (with some chemical enhancement) is likely the single greatest generator of electricity in the human race. According to brother's calculations ... Lance could roughly keep a 60 to 75 watt bulb (incandescent, better with LED) going ...


1

Try to use electricity and nitrogen to create ammonia for fertilizer production. I'm sure you see the difficulties in that, as electricity is not an element and thus the only element you have is nitrogen. The element hydrogen is missing. Ammonia requires hydrogen and nitrogen. Then, try to use electricity to create hydrogen from water (electrolysis) and use ...


1

The power produced would be so small scale and have so poor capacity factor that it isn't worth the effort. Firstly, you need investments. You can't make power without equipment. You need a generator. A wind turbine for example has a generator that makes power at 30% capacity factor. A playground? If we assume it's used 5 hours per day (and produces always ...


1

The industry term is "pumped storage" and it's used all over the place at a large scale. Some systems, like Oroville Dam, reverse their turbine-generators to be "motor-pumps", pumping water from the bottom of the dam to the top*. The Niagara Falls installation sits well above the Falls, and has separate pumps: they pump from the high ...


1

Methanol is probably the easiest burnable fuel to produce that is also sustainable. No it isn't. The only sustainable fuels that can scale to the needed amounts are invariably based on wind/solar electricity that is used to split water into oxygen and hydrogen in electrolysis cells. The easiest fuel to produce that is sustainable is hydrogen. The second ...


Only top voted, non community-wiki answers of a minimum length are eligible