1. Lecture Objectives Finish thermal comfort
Velocity
Temperature
Concentration
Discuss different issues about CFD AIRPAK

2. Thermal comfort
Temperature and relative humidity

3. Thermal comfort Velocity Can create draft
Draft is related to air temperature,
air velocity, and turbulence intensity.

4. Thermal comfort Mean radiant temperature potential problems Asymmetry
Warm ceiling (----)
Cool wall (---)
Cool ceiling (--)
Warm wall (-)

5. Prediction of thermal comfort
Predicted Mean Vote (PMV)
+ 3 hot
+ 2 warm
+ 1 slightly warm
PMV = 0 neutral
-1 slightly cool
-2 cool
-3 cold
PMV = [0.303 exp ( M ) ] L
L - Thermal load on the body
L = Internal heat production – heat loss to the actual environment
L = M - W - [( Csk + Rsk + Esk ) + ( Cres + Eres )]
Predicted Percentage Dissatisfied (PPD)
PPD = exp [ - ( PMV PMV2)]
Empirical correlations
Ole Fanger
Further Details: ANSI/ASHRAE standard 55, ISO standard 7730

6. CFD AIRPAK

7. Issues to discus Boundary conditions Mesh
Convergence (monitoring points)
Grid sensitivity analysis
Result presentations ……