Odor Intensity Ventilation Persons

Reference data and engineering information about odor intensity ventilation persons for hvac systems applications.

odorintensityventilationpersons

Overview

Engineering reference data for Odor Intensity Ventilation Persons in HVAC systems.

Key Formulas

Sensible Heat

$Q = \dot{m} c_p \Delta T$

Heat causing temperature change.

Latent Heat

$Q = \dot{m} h_{fg} \Delta\omega$

Heat causing moisture change.

COP (Cooling)

$COP = Q_c / W$

Coefficient of performance.

Variables

Symbol	Description	Unit
$Q$	Heat transfer	W
$\dot{m}$	Mass flow rate	kg/s
$c_p$	Specific heat of air	J/(kg·K)
$\Delta T$	Temperature difference	K

Odor Intensity and Ventilation

Odor intensity in ventilated spaces is influenced by occupant density and air exchange rates. Key factors include:

Odor Emission Rate (E): The amount of odor produced per person, often measured in odor units per second (OU/s) or grams per hour.
Make-up Air Rate (Q): The volume of fresh air supplied per unit time, typically in cubic meters per hour (m³/h) or liters per second (L/s).
Occupant Load (n): The number of persons contributing to odor generation.

A simplified model for steady-state odor concentration (C) in a well-mixed room is: $C = \frac{n \cdot E}{Q}$ where concentration is in odor units per cubic meter (OU/m³).

Higher ventilation rates dilute odors, reducing intensity. Design guidelines often specify minimum air change rates per person to maintain acceptable indoor air quality. For instance, typical values range from 5 to 10 L/s per person in office spaces, but this can vary based on activity and occupancy.

References

Original Source

Source: engineeringtoolbox.com