How Much Heat Does The Average Person Give Off When Sat Down.

johnk | 18:36 Thu 29th Jan 2015 | Science

10 Answers

rythmn and blues

Cells And Tissue Working Together How??

Correction How Much Heat Is Given Off By The Average Person

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Peter Pedant

Hi Johnnie if you are heavily into this sort of thingy
Why don't ducks feet freeze/ do Polar bears get lonely / and physics on an envelope are books for you

Asked a physicist this in 1980 and he gave the clothed/naked, fat or thin kind of answer ( there isn't one/ you cant estimate )

I asked a human - what wattage light bulb does it represent .....

and the answer is .... you start from their calorie consumption for 24 h
? 1.500 cals ? with no weight gain, then that is the output

remember that a dietary cal is a kilo-cal and multiply by 4.1 joule/cal
so that is around 6 mega-cal per day

and divide by the number of seconds in a day ( 22 000) or thereabouts

you get about 3 kW - sorry a watt is a joule per sec

johnk

Question Author

Peter, so for the time we were in there it was about 300watts making 3,000 kw in all. No wonder the place warmed up!!

mibn2cweus

I reckon your calculation went a little astray Peter -

https://www.google.com/webhp?tab=ww&ei=4n_KVLigO4WhyQSb1ICIBg&ved=0CAkQ1S4#safe=off&q=1500+kcal+per+day+in+watts

Peter Pedant

damn - it is even in wiki

It is reported in energy units per unit time ranging from watt (Joule/second) to ml .... (168 cm) tall would have a BMR of 1272 kcal per day or 53 kcal/h (61.3 watts). ... kcal/day (10455 kJ/day); with a mean BMR of 1500 kcal/day (6279 kJ/day).

I claim the 'method marks' I always was crap at fundamental arithmetic

thx mibz

Peter Pedant

I think I got the no of secs in a day wrong