Radiation and convection help

Mar 2010
11
0
hey im getting the answer 319 but the supposed answer is 219.12 please help me out

Consider a person standing in a room. The room air temperature is
maintained at 22OC at all times. The inner surface of the walls, floors and
the ceiling of the room are observed to be at an average temperature of
10OC.
Determine the total rate of heat transfer from this person if the exposed
surface area and the average outer surface temperature of the person
are 1.4 m2 and 30OC. Take the convective heat transfer coefficient to be
6 W/m2 OC and the emissivity of the human skin to be 0.95.
 
Mar 2010
105
20
Lithuania
P(conv) = k S dT = 6 1.4 (30-22) = 67.2 W.
P(emis) = \sigma em S (T^4 - T1^4) = 5.67*10^(-8) 0.95 1.4 ( 303^4(emitted) - 283^4(absorbed) ) = 151.95 W.
P = P(conv) + P(emis) = 219.15 W.