h: coefficient that depends on the shape and the orientation of the object. A: a

Question

                    h: coefficient that depends on the shape and the orientation of the object.

                    A: area                 

                    deltaT: temperature difference.                 

                    Calculate the rate of convective heat loss in Watts for an unclothed person standing in air at 23 degrees Celsius. Assume that the skin temperature is 34                    degrees Celsuismand that the body surface area is 1.5m^2. Calculate for ALL OF THE GIVEN air speeds below:                 

                    h= 6 W/m^2C air speed = still

                    h= 12 W/m^2C air speed = 1 m/sec

                    h= 28 W/m^2C air speed = 5 m/sec

Explanation / Answer

dq/dt = hAdT = 6 x 1.5 x (34-23) = 6 x 1.5 x 11 = 99 W

case 2

dQ/dt = 12 x 1.5 x (34-23) = 198 W

case 3

dQ/dt = 28 x 1.5 x 11 = 462 W

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