Latent Heat Gain from People Calculator

Latent Heat Gain Formula:

\[ Q_l = q_l \times n \]

Latent Heat Gain (W):

1. What is Latent Heat Gain from People?

Definition: Latent heat gain from people is the heat that results from moisture added to the air by human respiration and perspiration.

Purpose: This calculation helps HVAC professionals determine the cooling load required to maintain comfortable indoor conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_l = q_l \times n \]

Where:

\( Q_l \) — Total latent heat gain (Watts)
\( q_l \) — Latent heat gain per person (Watts)
\( n \) — Number of people in the space

Explanation: The latent heat per person is multiplied by the number of people to get the total latent heat load.

3. Importance of Latent Heat Calculation

Details: Proper calculation ensures adequate dehumidification and prevents uncomfortable humidity levels in occupied spaces.

4. Using the Calculator

Tips: Enter the latent heat gain per person (typically 60-75W for office workers) and the number of people. The ±5% accounts for normal variation.

5. Frequently Asked Questions (FAQ)

Q1: What affects latent heat gain per person?
A: Activity level (resting vs. exercising), clothing, and environmental conditions all affect the rate.

Q2: Why the ±5% variation?
A: Individual metabolic rates and activity levels vary, so we account for this uncertainty.

Q3: How does this differ from sensible heat?
A: Sensible heat affects air temperature directly, while latent heat affects humidity through moisture addition.

Q4: What's a typical value for q_l?
A: Office workers: ~70W, Restaurant customers: ~80W, Exercising: ~200W or more.

Q5: Should I add a safety factor?
A: For critical applications, consider adding 10-20% to the calculated value.