CONVECTION HEAT TRANSFER Heat Transfer Solution: a. Find heat flux ( ) through the insulation. Q Q k  A DT Dx Q A 0.8 Btu hr   ft   °F 600°F 105°F 1  in 1  ft 12  in 4752 Btu hr   ft² b. Find the bulk temperature of the environment. Q h  A  (T_ins T_b) (T_ins T_b) Q h  A T_b T_ins Q h T_b 105°F 4752 Btu hr   ft² 950 Btu hr   ft²   °F T_b 100°F HT-02 Page 24 Rev. 0