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I heard a an excellent presentation by Ron Auvil top top VAV systems, and it got me thinking…

Can you dimension a advertising system/perform a block fill by the number of occupants?

Yes! 

No, I"m simply kidding. That"s stunner talk. Over there is method more to it than that.

You are watching: How many btu does a person give off

However, in a advertising environment, if the building"s perimeter is influenced by warmth loss/heat gain to the outdoors, the internal zones room “cooling only” zones, with the primary load usually being PEOPLE.

This is whereby the 500 BTUs every hour come in. ~ above average, a sedentary worker in a structure will include 500 BTUs per hour come ALL areas of the building, whether it is warm or cold outside. This creates an concern in the winter when the perimeter that a structure requires heating and also the facility of the building requires cooling.

Now, store in mind that a sleeping human being generates heat more in the community of 260 BTUs/hr, so if it"s a yes, really boring job where workers doze turn off at your computers, it may be less.

Add in the internal electric loads indigenous lights, computers, and also other equipment. You begin to realize that external loads room only part of the equation, particularly in huge commercial buildings with numerous occupants. In fact, in a busy commercial space, the interior loads generally far outweigh the warm entering native the outside (external load).

This is whereby the principle of thermal diversity comes in. On a cold day, there might be a need for warm at the building"s perimeter come offset heat losses come the exterior while quiet requiring cooling in the center of the structure to counter the internal loads.

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In a an excellent commercial design, girlfriend must have some method of handling the heat diversity between internal and also perimeter zones and maintaining appropriate ventilation/outdoor air.