Compact Fan Heater : Wood Heaters Nsw : Wood Pool Heater Plans.
Compact Fan Heater
- A fan heater is a heater that works by using a fan to pass air over a heating element. This heats up the air, which then leaves the heater, warming up the surrounding area. They can provide very rapid heating of a room, however may be relatively noisy in operation.
- A fan heater is a convection heater incorporating fan forced air circulation to provide much quicker and more even heat distribution.
- Closely and neatly packed together; dense
- Having all the necessary components or features neatly fitted into a small space
- a small cosmetics case with a mirror; to be carried in a woman's purse
- (of a person or animal) Small, solid, and well-proportioned
- have the property of being packable or of compacting easily; "This powder compacts easily"; "Such odd-shaped items do not pack well"
Several years ago, I got this cool little toy from a conference vendor who sells stuff related to the photonics industry. (I forget who the vendor was.)
It's shaped like a windmill or a fan - a pint-sized whirligig. It has five little LEDs on the blades, each of different colors. You press a button, and voila! The blades turn and the lights switch on. But there are oscillators that control the current such that the lights turn on and off with different frequencies.
As I write this, it occurs to me that this simple toy would have been a technological marvel a century ago, almost like magic. Even a half century ago, this would be considered an enormously advanced piece of hardware. There were no LED lights on the market in 1961. While the concept of electroluminescence goes back to the first decade of the twentieth century, the first visible light diode, which gave off a weak red light, was developed in 1962. They also cost a few hundred dollars!
So this humble little toy, that would cost less than ten dollars to buy, is a real marvel.
I have to confess I never liked incandescent lights very much. Too delicate and wasteful, 90% of the energy they consumed is emitted as infrared radiation, which we preceive as heat. They make good heaters, but not good light sources. (Think of them as being similar to the tiny oven eyes that you cook on.) And I dislike compact fluorescents even more. Environmentalists can't get anything right. They shut down America's incandescent light bulb factories, so we have to use these infernal, Mercury-filled devices from the Pit, where you need a Hazmat suit to dispose of the things. The mercury toxicity is much worse, in my opinion, then the plant food, er, carbon dioxide that these things give off. Even if humans WERE causing global warming, which is dubious, switching to CFCs is like shooting Godzilla with a spit ball. Grrr.
But I love LED lights and it is these that will really replace incandescents. I've been following the research for about 15 years now. You can get them in almost any color, and they are incredibly energy-efficient. They're still expensive, but they're getting more and more powerful, the cost is coming down, and they last forever. Some of them contain arsenic (in gallium arsenide), but they're solid state devices, so it means you have to swallow them whole or grind them up puposefully for toxic effect, and if you do THAT, you deserve to win a Darwin Award. (Actually, if you swallowed one whole, it would just pass through with no effect.)
Ok, off my soapbox - I'm sorry for the excursis. Now for the title: I identified three types of angular motion that this windmill light toy is undergoing. First, the whole thing is hanging by a long string, so its right-to-left motion is that of a simple pendulum, with gravity supplying the torque. Then, there's torsion in the string, which is unraveling, so the whole toy is twisting. And, finally, the blades of the whirligig are turning, so the lights are spinning.
I thought about setting up a Hamiltonian for the system and solving for the equation of motion. Or not. It's Sunday, it's almost 10 PM, and I'm lazy. Maybe when I get a little time...but speaking of time, if you look closely, you can tell exactly what time I acquired this photograph.
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