That 100 W heater (human body) is at rest. If you want to heat your house
cheaply, organize a dancing party. It may go up to 500 W a person, and you
will save a lot of money in winter. That is, providing the guests bring
their own booze. With enough people, and not much freezing outside, the
house may even overheat.
----- Original Message -----
From: "James Frysinger" <[EMAIL PROTECTED]>
To: "U.S. Metric Association" <[email protected]>
Sent: 08 Feb 07, Thursday 10:13
Subject: [USMA:40394] Re: W & J
Right you are, David. I always told my physics students that humans are
rated at about 120 W for men and 80 W for women.
For a man, a 10 MJ/d diet is about right. That works out to an energy
intake rate of about 115.8 J/s or nearly 116 W. That's also approximately
the heat dissipation rate for men. I've seen programs that calculate air
conditioning loads and they usually figure about 100 W per occupant. In
other words, a person is like a 100 W heater that is on all the time. So
if you want to air condition classrooms, etc., you have to allow for
people as well as heat intrusion from outside, heat output by lights, etc.
I think that Jesse meant to write "human energy intake rate" instead of
"human energy intake", since power is a rate of energy transfer. He just
dropped a simple but important word there.
Jim
David King wrote:
Energy is measured in joules, power in watts.
David King
/Metric is British and best!/ Speak in English, Measure in Metric
Ziser, Jesse wrote:
That data left out something I think is a cool metric factoid: a healthy
adult human energy intake
is around 100 watts average. That just blows my mind. To use no more
average power than a light
bulb, we must be phenomenally efficient. Ain't nature cool?
--- Stan Jakuba <[EMAIL PROTECTED]> wrote:
I came across data from Scientific American mag. that ad light to the
distinction in measuring
power and energy by showing when to resort to one or the other.
Stan J.
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