Re: Increase in Room Temperature by One Human

On Jan 12, 5:24 am, "W. eWatson" <notval...@xxxxxxxxxxxxx> wrote:
Uncle Al wrote:
"W. eWatson" wrote:
It's been a very long time since I had a physics course that might address
this.

Suppose I have a 10x10x10' room that has one human in it. The room is fully
insulated. A human produces 100 watts, but 1/2 of that is in heat. What I
would like to know is if the room was initially at 60F, what temperature
would it be at say 6 hours later? I would think this somehow involves
knowing the specific heat of a human body and air. Roughly or exactly, how
does one make the calculation? I have no idea what the specific heat is for
either item.

Yer average male meatbag basal metabolizes 2000 Kcal/day.  Get the
specific heat of air, the mass contained.  Get the the specific heat
of the walls and their thermal conductivity, then their mass, area,
and thickness, then the temp gradient inside versus outside.

<www.engineeringtoolbox.com/air-properties-d_156.html>
<http://www.efunda.com/Materials/common_matl/show_gas.cfm?MatlName=Air0C>
<http://coloradoenergy.org/procorner/stuff/r-values.htm>
<http://www.globalmodularconcepts.com/thermal%20performance.htm>

Thanks. I should have said a perfect insulator. No heat loss to the walls..
I'm just curious what the human body can do to raise the temperature. Would
it be 0.1, 0.5, 1, 2, 5 degrees? However, introducing common insulators
would be interesting. My curiosity was raised on this when I read a human
can raise the temperature of a room [substantially?]. It never gave a hint
as to how much.



Some simple observations:

-If you don't take off your clothes before getting into a good
sleeping bag, you can start sweating at 10 degrees F, assuming a calm
night. This means you've raised the temperature enough that your body
needs to cool itself, even while sleeping. Perhaps this would be 80F?
(Anecdotal, but first hand.)

-If you had a *perfectly* insulated room, you could achieve any
temperature eventually, except that you would die of heat stroke
first.

Were you reading about superinsulated houses?

-tg






--
                                W. eWatson

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