Equations for Convection Heat Transfer Coefficients
Adapted from ASHRAE 1997
hc in Btu/(h·ft2 ·°F), V in fpm, and M in met units, where 1 met = 18.4 Btu/h·ft2
Condition | Equation | Limits |
Seated with moving air | hc = 0.061x V0.6 | 40 < V < 800 |
hc = 0.55 | 0 < V < 40 | |
Reclining with moving air | hc = 0.475 + 0.044xV0.67 | 30 < V < 300 |
hc = 0.90 | 0 < V < 30 | |
Walking in still air V is walking speed | hc = 0.092 x V0.53 | 100 < V < 400 |
Active in still air | hc = (M - 0.85)0.39 | 1.1 < M < 3.0 |
Walking
on treadmill in still air (V is treadmill speed) |
hc = 0.146 x V0.39 | 100 < V < 400 |
Standing person in moving air | hc = 0.068 x V0.69 | 30 < V < 300 |
hc = 0.70 | 0 < V < 30 |