hy there is a little amount of heat loss for fully covered insulated pipe compared to bare pipe?

Need solution ,thick walled P.V

10. Recall when you were collecting data for the Entrance Loss experiment, there was a ten second delay before the data was posted in Excel. Why was there a delay, and why was it important? 11. Were your theoretical entrance loss factors, KL, higher or lower than your experimental value? What may be some causes for each entrance type? Concentric Tube Heat Exchanger 12. Why was it difficult to achieve steady-state conditions? 13. List at least two assumptions that are being made in the Heat Exchanger experiment, and explain the reasons why they are approximations. 14. What are thermal and hydrodynamic entrance lengths? Are either (or both) of them an issue for the experiment? Why or why not?

please urgent