Indoor Design Temperatures

Overview

Engineering reference data for Indoor Design Temperatures 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

Winter Indoor Design Temperatures

Acceptable indoor temperatures for winter conditions vary by room type and activity level.

Summer Indoor Design Temperatures

For summer conditions, indoor environments should maintain:

• Optimum temperature: 20 °C to 22 °C
• Optimum relative humidity: 40% to 65%

For short exposures (less than 3 hours), acceptable indoor conditions based on outside temperatures with constant indoor dew point at 14 °C:

Interactive Charts

References

• Original Source