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