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Automotive News & Views Are automobiles a major cause of global warming?
6727 messages, Last post on Nov 05, 2009 at 2:29 PM
You are in the Automotive News & Views Forum. Your Hosts are steve_ & claires
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Replying to: gagrice (Nov 02, 2008 5:48 pm)
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Replying to: avalon02wh (Nov 02, 2008 5:02 pm) And the other link I can agree with that the Earth would have froze w/o the radiation, and would be in equilibrium with the surface. Consider that even with the Sun providing so much energy, the earth's oceans once froze over. Now take away the Sun and take the air to -458F (near absolute zero), and that freezing moves inwards probably at 0.5 - 1 mile / year. Whether rock is a good insulator or not, it will conduct heat away. There is not enough radioactive elements in the Earth to stop this, and many of the elements have long-halflives, meaning they're not radiating much anyway. There is nothing that will stop that -458F temperatures from conducting the heat away, from hundreds of thousands of sq. miles of rock. What has kept this from occurring is the heat from the Sun for the last 4 billion years. Do a calculation of how much energy the Earth has received over its history from the Sun, and compare that to the amount of radioactive material in the Earth and how much energy that has been. Which is larger? It is simple that the Sun puts much more energy into the Earth's system, and keeps the planet from freezing. |
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Replying to: avalon02wh (Nov 02, 2008 5:18 pm) Why would I want to cut down on my electricity usage, when it replaces my heating with oil? I'm buying 1500W electric space-heaters for my house this year. And I switch to incandescent light bulbs in the colder months to provide more heat.  I agree with your points though, that lead to the fact that you can't put the genie back in the bottle. Now that we know how to get oil and such, and the benefits, someone, somewhere is going to us eit.
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Replying to: kernick (Nov 03, 2008 6:05 am) Right tool, right job. Like, say, commuting in a gas miser and saving the dually for towing the horses to the trailhead on the weekend.
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Replying to: steve_ (Nov 03, 2008 6:28 am) What? If I use 20W CFC + 80W from a heater is more efficient than a 100W incandescent? 100 is not < 100 ! Law of Conservation of Energy, my friend. 100W is 100W no matter how it's obtained and used. Whether your coffee pot, iron, light bulb ... is drawing the energy which is all converted into heat (kinetic energy is also converted to heat), it's the same. The added expense of CFC's and extra heaters do not make sense during heating season, when compared to the inexpensive, great heating incandescent.
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Replying to: kernick (Nov 03, 2008 7:34 am) The bulb could be in a can in the ceiling, mostly heating your attic. The bulb could be in a lamp near a wall, and could induce thermal conduction away from the place where you want the heat to be (hot spot on a wall, conduction through the wall, increasing heat loss of the room). Where's Tidester this morning?  Good discussion of the question here: Physics Forum
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Replying to: sidious6688 (Nov 02, 2008 6:02 pm) I know they are dangerous. I have had two pop the first time they were turned on. I took them back for exchange. I handle with light leather gloves. I also get way back when I turn them on the first time. Mercury is nasty stuff. It will present problems in the future for disposal.
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Replying to: gagrice (Nov 03, 2008 9:58 am) |
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Replying to: gagrice (Nov 02, 2008 5:48 pm) Ahh, a man after my own heart. The problem I have found with CFLs is that they don't reach peak brightness as quickly as the old bulbs. You end up fumbling around in twilight for a few minutes while the bulbs ramp up. I worry that when the commies invade I'll have trouble finding my gun. 
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Replying to: steve_ (Nov 03, 2008 7:49 am) I got my little sister's Easy-Bake Oven right here that says different. A non-CFL bulb IS in effect a radiant heater because most of the radiation it gives off is infrared waves (heat). That's the reason it's not so good as a light source, most of the energy inputs make heat, not light. Because a light bulb does emit light it is not QUITE as good as a purpose built radiant heater which has a fan to circulate the warm air. So you are both right...and both off topic. 
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