Discussion Forum
Que.  An oil cooler in a high performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m² K. Find out the heat transfer rate? 
a.  238.43 W 
b.  190.68 W 
c.  543.67 W 
d.  675.98 W 
Correct Answer:190.68 W
