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15. Por equivalent inlet conditions, why should a counterflow heat exchanger have better effectiveness than a parallel unit?

15. Por equivalent inlet conditions, why should a counterflow heat exchanger have better effectiveness than a parallel unit?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.14P
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15. For equivalent inlet conditions, why should a counterlow heat exchanger have better effectiveness than a parallel unit? 16. How would corrosion or fouling in the pipe influence the results of effectiveness? Please explain in detail. Transient Cooling 17. What is the thermal length and why is it considered important in the Transient Cooling Experiment? 18. What is lumped capacitance? What does the Biot number represent, and why must it be less than 0.1 to use lumped capacitance? 19. For either a flat plate or flow through a duct, how was the convective heat transfer determined? Please explain. 20. What heat transfer mechanisms are being ignored, at least as possibilities, and where would they occur?
Transcribed Image Text:15. For equivalent inlet conditions, why should a counterlow heat exchanger have better effectiveness than a parallel unit? 16. How would corrosion or fouling in the pipe influence the results of effectiveness? Please explain in detail. Transient Cooling 17. What is the thermal length and why is it considered important in the Transient Cooling Experiment? 18. What is lumped capacitance? What does the Biot number represent, and why must it be less than 0.1 to use lumped capacitance? 19. For either a flat plate or flow through a duct, how was the convective heat transfer determined? Please explain. 20. What heat transfer mechanisms are being ignored, at least as possibilities, and where would they occur?
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?
Transcribed Image Text: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?
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