3. A counter flow double pipe heat exchanger using super heated steam is used to heat water at the rate of 10500 kg/hr. The steam enters the heat exchanger at 180C and leaves at 130C. The inlet and exit temperature of water are 30C and 80C respectively. If the overall heat transfer coefficient from steam to water is 814 W/m2 K, calculate the heat transfer area. What would be the increase in area if the fluid flow were parallel?

Pls provide a complete and step by step solution. TY!

Problem 4. In order not to damage the resistance in the kettles, the difference between the temperature of the heater and the fluid should not exceed 25 °C. If the heat transfer area between the fluid and the heater is 78.5 cm² and the heat transfer coefficient is 400 W/m².K, find the maximum allowable power of the heater in order to boil water?

please show how to derive h using nusselt equation and solve for qheatloss

PROBLEM BACKGROUND The most common heat exchanger used in industry is a 'shell-and-tube' heat exchanger as illustrated in the figure. One fluid is fed into a set of tubes around which a second fluid is circulated. In the example shown, complex flow patterns illustrated by arrows show the flow may be partially parallel flow and partially crossflow. PROBLEM STATEMENT For this problem, we will consider a single tube in a crossflow configuration as shown. Air is to be heated to the desired temperature to feed a bioreactor. The air is feed flows normal to the outside of the center tube. Saturated steam is flows through the inside of the tube to provide the heat. The air is being fed at an average velocity of 15 m/s though the outer pipe of the heat exchanger at 27 °C and 1 atm. It heated by using saturated steam which condenses at 107°C over the surface of the inner tube. The tube is 5 m long with an outer diameter of 0.015 m and an inner diameter of 0.014 m. For simplicity in answering…