How many watts does the human body put off
How many watts does the human body put off
(OP)
I have done some looking around and I did a little math on my own but does anyone have real info on how many watts the human body puts off at rest.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
How many watts does the human body put off
|
RE: How many watts does the human body put off
RE: How many watts does the human body put off
Regards,
SNORGY.
RE: How many watts does the human body put off
Good on ya,
Goober Dave
RE: How many watts does the human body put off
- Steve
RE: How many watts does the human body put off
I saw anything from 96 to 116.
130 is the highest number I have seen yet but I think that will give me a nice higher end to shoot for.
Incase anyone is wondering I am building a stirling powered cool jacket to wear when riding my mororcycle.
RE: How many watts does the human body put off
However, physical activity cranks up the caloric output quite a bit:
http://www.nutristrategy.com/activitylist2.htm Based on 240 kcal/hr, that's 280 W.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: How many watts does the human body put off
Second: You're in the wind (very important!) and in outdoors conditions for specific periods of time directly exposed to the weather and cold, NOT the "average" generic TV-watching couch potatoe doing average "nothings" for an average 24 hour day indoors. Balancing that exposure to wind and temperature is the fact that you will be sitting/riding, not running the Boston Marathon.
Allow some testing. Some adjustment. A throttle valve. Or two. A zipper.
Be safe.
RE: How many watts does the human body put off
in the mean time you might put a cooler in the saddle bags,, fill it with ice and a bit of water, circulate the water through your jacket with small pump, you sort our the generic heat loads well enough without having to solve all of the design problems
good luck
RE: How many watts does the human body put off
Regards,
SNORGY.
RE: How many watts does the human body put off
leave room for the beer, the most important part of the design effort
RE: How many watts does the human body put off
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: How many watts does the human body put off
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: How many watts does the human body put off
Regards,
SNORGY.
RE: How many watts does the human body put off
So far, nobody mentioned the fact that the heat coming from a person is divided in a sensible part and a latent part in the form of water vapour.
On the other hand, actually sweating will cool the person as well as the air in the room...
RE: How many watts does the human body put off
Or are you suggesting riding bareback?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: How many watts does the human body put off
- Seated at theater
Total heat : 95 W
Sensible heat : 65 W
Latent heat : 30 W
- Moderately active office work
Total heat : 130 W
Sensible heat : 75 W
Latent heat : 55 W
(Adjusted values are based on 24 °C room dry-bulb temperature and rounded to nearest 5 W)
Regards
RE: How many watts does the human body put off
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: How many watts does the human body put off
RE: How many watts does the human body put off
1120 W/m^2 * (3/8m)*(1m) = 420 W
But, that occurs for 2 hrs a day in a hot climate, and the above assumes 100% absorption.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: How many watts does the human body put off
This may sound silly but I had not taken into account the exposure to the sun.
I was basing a lot of my ideas on those cool suits that are made for race car drivers.
I suppose some of the open cockpit cars do see some sun but may not have the same exposure as a motorcycle rider.
To make more efficient use of the suit's cooling I would imagine that some insulation would be appropriate.
I could also imagine that the wind would do a good job at balancing out the sun's effects while in motion.
The Stirling unit I am using is capable of about 150 watts of heat lift and only weigh about 7 lbs.
This is a lot lighter than the ice water pump systems used in some race cars.
I don't really expect to be completely cooled in every riding situation I would just like something that can help out in keeping me cool during average city riding while wearing complete safety gear.