A spherical container 20 inches in diameter is filled with water at a temperature of
70
Solution
from Energy balance equation
We know that
ln((Tf-Tb)/(Tf-Ta))=-hAt/pVCp
Where
Tf=bath oil temp
Tb=Final container water temp
Ta=initial container water temp
V=volume of container
A=surface area
h=heat transfer coefficient of thewall of the container is= 40,000 Btu/hr ft2