Co2 Comfort Level

Reference data and engineering information about co2 comfort level for physiology applications.

co2comfortlevel

Overview

Engineering reference data for Co2 Comfort Level in physiology.

Key Formulas

Basal Metabolic Rate

$BMR \propto M^{0.75}$

Kleiber's law — metabolic rate scales with body mass.

Heat Loss

$Q = hA(T_{skin} - T_{air})$

Convective heat loss from body.

Variables

Symbol	Description	Unit
$Q$	Heat loss	W
$h$	Heat transfer coefficient	W/(m²·K)
$A$	Body surface area	m²

Normal CO2 Levels

5 rows

Effects of CO2 concentration on adults in good health
Condition	CO2 Concentration (ppm)(ppm)
Normal outdoor level	350 - 450
Acceptable levels	< 600
Complaints of stuffiness & odors	600 - 1000
ASHRAE & OSHA standard	1000
General drowsiness	1000 - 2500

Source: engineeringtoolbox.com

Extreme and Dangerous CO2 Levels

3 rows

Potentially hazardous CO2 concentrations
Condition	CO2 Concentration (ppm)(ppm)
Slightly intoxicating, increased breathing & pulse rate, nausea	30000 - 40000
Above plus headaches & sight impairment	50000
Unconscious, further exposure leads to death	100000

Source: engineeringtoolbox.com

ASHRAE Standard 62-1989 Ventilation Requirements

3 rows

Recommended ventilation rates per occupant
Space Type	Ventilation Rate (cfm/occupant)(cfm)
Classrooms & conference rooms	15
Office space & restaurants	20
Hospitals	25

Source: ASHRAE Standard 62-1989

Note: 1 cfm (ft³/min) = 1.7 m³/h = 0.47 l/s

References

Original Source

Source: engineeringtoolbox.com