reply to post by Mary Rose
No it's not saying the same thing. Refer to the dictionary and my explanation in your atmos clock thread. I gave you an example of how a power
generating plant must have 200 watts of fuel power input to light a 72 watt incandescent light bulb in your home. Here's the link and illustraiton:
I picked a 72 watt light bulb example, because it's a doubling of the 36 units at the home in that illustration, to make the math simple, but it's
close enough to a 75 watt light bulb to give you a practical close example.
We say energy out equals energy in according to the following equation:
Power in to coal power plant of 200 watts = 4 watts useful light energy + 196 watts dissipated energy.
So 200 watts in to the power plant in the form of fuel results in 200 watts out, but in that example we can say 196 watts has dissipated in the form
of heat (mostly) comprised of:
124 watts dissipated at coal plant
4 watts dissipated in the power lines
68 watts dissipated in heat from the 72 watt incandescent light bulb
This leaves about 4 watts of useful light power coming from the 72 watt light bulb.
And yes the dissipated energy is normally considered waste, but it's not always wasted. In the winter, the heat from the incandescent bulb heats your
home (partially) meaning your heater needs to provide that much less heat. I wouldn't say you're "re-using" the dissipated energy, but you could say
you're using it as a perhaps unintentional auxiliary heat source.
In contrast, in the summer, your air conditioner has to work that much harder to offset the extra heat, so in that case it's not just a loss, it's a
penalty also which adds 68 watts of cooling load to your air conditioner in addition to the 68 watts of heat from the light bulb, for a total of 136
So, by turning the 72 watt light bulb off in the summer, you can save 136 watts of electricity if you're running an air conditioner. Now to learn more
about this, I'll be making a DVD series explaining how light switches can solve the energy crisis by getting a 136 watt savings from a 72 watt light
bulb, be sure to watch for it! (just kidding but your hoaxer heroes say things just as ridiculous).
edit on 23-11-2013 by Arbitrageur because: