a smooth thin wallws cylindrcan pipe made up of a pipe lengt

a smooth thin wallws cylindrcan pipe made up of a pipe length L = 3m, diameter D = 10cm is used to transfer hot water. the hot water enters the copper pipe at a temperature Th = 90 degree celcius and mass flow rate m = 0.2kg/s. the water has the constant physixal prperties density = 1000kg/m^3, dynamic viscosity 1.0 x 10^-6 m^2/s, 1 atp and temperature 20 degree celcius flows over the copper pipe. the convective heat transfer coefficient between the air and the outer surface of the copper pipe is 20W/(m^2K)

CONSTANT RESISTANCE DO NOT OCCUR. ADDITIONALLY ALL EFFECTS OF THERMAL RADIATION MAY BE NEGLETED.

1. calculate the convective heat transfer coefficient between the water and the inner surface of the pipe.

2. what is the overall transfer coefficient U between the water and the ambient air based on the outer surface area A of the pipe.

3. consider the copper pipe as a heat exchanger, draw the temperature profiles of the water and air on the same graph.

4. carry out the calculations using the operating characteristic of a heat exchanger, and determine the number of transfer units N of the heat exchanger.

5. determine the efficiency of the heat exchanger.

6. determine the heat transfer rate from the water to the ambient air

7. find the temperature of the water at the exit of the pipe

8. what is the new exit temperature of the water, if the inlet temperature Th increases from 90 to 95 degree celcius