Equations for Convection Heat Transfer Coefficients
Adapted from ASHRAE 1997
hc in W/(m2 · K), V in m/s, and M in met units, where 1 met = 58.2 W/m2
Condition | Equation | Limits |
Seated with moving air | hc = 8.3 x V0.6 | 0.2 < V < 4.0 |
hc = 3.1 | 0 < V < 0.2 | |
Reclining with moving air | hc = 2.7 + 8.7 x V0.67 | 0.15 < V < 1.5 |
hc = 5.1 | 0 < V < 0.15 | |
Walking in still air V is walking speed | hc = 8.6 x V0.53 | 0.5 < V < 2.0 |
Active in still air | hc = 5.7 x (M - 0.8)0.39 | 1.1 < M < 3.0 |
Walking
on treadmill in still air (V is treadmill speed) |
hc = 6.5 x V0.39 | 0.5 < V < 2.0 |
Standing person in moving air | hc = 14.8 x V0.69 | 0.15 < V < 1.5 |
hc = 4.0 | 0 < V < 0.15 |