What is the relation between the number of people and the temperature in the room?

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Mario Hirz

As an averaged estimation, the heat production of an adult human is about 100W. With this value, you can calculate the induced heat energy amount in a room depending on the number of persons. It is important to consider the head losses through walls, windows, etc. in the simulation model.

Kind regards,

Mario

Mahmoud Al-Faris

is this heat coming from the metabolic process of the person??

so not all the 100 W goes out to the room temperature ?? if it is for powering the brain.

is there any paper deals with room size or number of persons and the temperature??

Carlos Araújo Queiroz

For a normal distribution of human males, females, and children; seated or at rest, such as at in audithorium; we have (*): sensible heat gain per person: 200 Btu/h; latent heat gain per person: 130 Btu/h.

(*) A.M. Khashab, P.E.; "Heating, Ventilating, & Air Conditioning Systems Estimating Manual", 2nd ed., McGraw-Hill, New York, 1984, p. 308, apud: "ASHRAE Handbook of Fundamentals", 2nd ed., American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, 1981.

Subathra . B

Occupancy is directly proportional to the room temperature.

Occupancy predication can be done with MPC if the model is available.

Till date such kind of mathematical equation is not available, my view is the relation can't be fixed with few equations. Because it depends on not only the occupancy but also the room size, AC capacity, number of doors and windows.

one foremost think we have to consider that is atmospheric temperature. It plays a vital role in HVAC systems modeling and control.

In addition all the human being body heat need to be taking in to account.

Hence you can develop one model equation for your specifications. Everybody's equation need to be distinct.

thanks a lot everyone, actually, as Carlos said and Subathra too, many parameters affect the temperature.

I have read about ASHRAE and PMV index, the thing is in the equation of PMV you have to use a value for the metabolic rate of the person, so what about if there is more than one person. should we multiply the metabolic value by the number of persons???

Well, but we cant multiply like your idea but roughly you can calculate like this.

Ok, so what is the precise method??

and is the PMV for a group of people?? if it is, what is the value of metabolic rate that should be considered in the calculation??

appreciate your cooperation, thanks