Given a shell and tube heat exchanger with a heat transfer fluid on the inner tube with a heat transfer coefficient h1 = 30 W/(m2 K) and a fluid on the outer side of the tube with heat transfer coefficient of h2 = 55 W/(m2 K ). The tube is made of stainless steel with a thermal conductivity of 43 W/ mK. Assume the area of heat exchange is the same throughout the exchanger of 100 cm2 and calculate the overall heat transfer coefficient of U. You may ignore the effects of fouling.