Question

A flat composite plate is made of two layers of aluminum and steel of 5cm and 2cm thickness respectively. the thermal conductivity of aluminum and steel are 205W/mK and 45W/mK respectively. the hot surface of aluminum side is in contact with hot liquid at 200 deg C, the heat transfer coefficient of liquid film is 14W/m2K. The cold side steel is in contact with liquid at 25 deg C, heat transfer coefficient of liquid film being 29 Wm2K
Overall coefficient of heat transfer?
Heat transfer rate from hot liquid to cold liquid through a surface area of 10m2?

Answer 1

you need to know the following thats all:
H:HEAT trnsfer rate/heat current/the rate of flow of heat
K:thermal conductivity /co-eff of heat transfer
Tc=final temp which body reaches
Ti=initial temp of body
A:area of cross section
L:length of bar
SI UNIT of K: J/S/m/K OR W/m/K
H: W

K'=2K1.K2/K1+K2

H=K.A.(Tc-Ti)/L
all daata given