Heat, humans VS computers?

[mrzed]

That energy eventually becomes heat.

Yes, but only in the laws of thermodynamics sense. It does not mean that we radiate that heat. If we throw a ball, that movement puts energy into the ball, it might eventually become heat, but we don't radiate it.

We intake energy as food. The output of that energy can take various forms, heat is only one of them.

I'm not arguing that caloric intake is unrelated to the amount of heat we radiate, but it is only a factor.

If we were all in the matrix, things might be different. Here in the world, we use our energy for all sorts of things. I eat more than average because I ride my bike 25 km each day to work and back. Don't try to tell me that all those extra calories get radiated as extra heat from my body.

 

[Haircut]

It doesn't matter what the form of the energy is.
If a person eats 3,000 calories in a day and the body uses 2,500 of these doing whatever it does. Radiating heat to outside, moving, making sounds etc. then it still uses up 2,500 calories.

This is a fixed amount of joules in a day and since 1 watt = 1 joule per sec then we can calulate the wattage of the body.

*edit* d'oh the 'equivalent to' obviously doesn't work in this font.

 

[mrzed]

That's true of the total power generated by the human body. I was responding specifically to the original post about the heat radiated by the body. They are two seperate things. I'm not quite sure why people keep trying to correct me here. Pehaps the thread just took a tangent that I failed to notice

edit: Thinking about it some more, I realized that if you never left the house, it would be close to the same thing. Perhaps the idea is something along those lines.

 

[Armitage]

<< If we were all in the matrix, things might be different. Here in the world, we use our energy for all sorts of things. I eat more than average because I ride my bike 25 km each day to work and back. Don't try to tell me that all those extra calories get radiated as extra heat from my body. >>



Nope, it doesn't radiate directly from your body as heat, but it does end up as heat. For the case of a bicycle:

- friction in the gearchain, bearings, tire/road and internal to the tire & frame all creates heat directly.
- braking obviously creates heat (I've had my rims hot enough to hiss & throw off steam when I hit a puddle!)
- Air turbulence and skin friction becomes heat as well.

 

[HiroP]

I didn't eat anything today, so my body temp is 0 degrees Kelvin. I use the heat from my monitor to keep from solidifying. I've found that my body's BTU/hr output changes depending on what is displayed on my monitor, while the monitor's output remains constant. The following equation decribes this effect, where Np=% of exposed flesh of the model in the image, Tv= length of viewing time in minutes, and Tsx= length of time since last romantic encounter, expressed in solar sunspot cycles, and Nt = avg normal BTU/hr output of one's body. Therefore: BTU/hr= ((Tsx x Np)/ Tv) + (Nt/ (Nt-Tv)), which, when graphed as y=BTU/hr and x=Tv, is displayed as a bell curve. Other variables may have to be incorporated into this equation, such as: Amount of curry ingested before viewing, degree of atractiveness of the check-out girl at the grocery if one just went shopping, and ones distance from any geo-thermal activity