15. For equivalent inlet conditions, why should a counterlow heat exchanger have better effectiveness thana parallel unit?16. How would corrosion or fouling in the pipe influence the results of effectiveness? Please explain indetail.Transient Cooling17. 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 touse lumped capacitance?19. For either a flat plate or flow through a duct, how was the convective heat transfer determined? Pleaseexplain.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 delaybefore 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? Whatmay be some causes for each entrance type?Concentric Tube Heat Exchanger12. 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 thereasons why they are approximations.14. What are thermal and hydrodynamic entrance lengths? Are either (or both) of them an issue for theexperiment? Why or why not?

In the counter flow setup, the liquids are traveling along the heat exchanger in opposite…

Answered: 15. Por equivalent inlet conditions,…

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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The clean U for an exchanger is 800 BTU/(hr 0 F ft2). Its tube area is 600 ft2. After operating for several months heating water from 50 0F to 160 0F at a flow rate of 210 GPM with a heating fluid on the shell entering at 290 0F and exiting at 160 0 F has the overall U decreased significantly?
(1) A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C? C) If the heat exchanger is changed to parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?
Concentric Tube Heat Exchanger For equivalent inlet conditions, why should a counterflow heat exchanger have better effectiveness than a parallel unit?
7) Outlet Temperature and Heat-Transfer Rate via Minimum Allowable Approach Temperature. Hot oil at a flow rate of 3.00 kg/s (Cp = 1.92 kJ/(kg-K)) enters an existing 1-1 counterflow exchanger at 400 K and is cooled by water entering at 325 K (under pressure) and flowing at a rate of 0.70 kg/s. The overall U = 350 W/(m².K) and A= 12.9 m². Calculate the heat-transfer rate and the exit oil temperature if the minimum allowable approach temperature is to be 10 °C (10 K).
It is based on the centralised production of chilled water and its distribution for a wide range of indoor air cooling purposes. Consumer Substation Thermal Energy Storage Tanks Hot Plate heat exchanger District Cooling
The purpose of the regenerative heat exchanger is to essentially recycle the heat rejected in step (B) as heat absorbed in step (D). Show why this works for the case of a general working fluid with heat capacity, Cv(T). The Stirling engine (invented in 1816 by Robert Stirling) is a heat engine that produces work through cyclic compression and expansion of a gaseous working fluid, such as hot air. An idealized cyclic process, aptly named the Stirling Cycle, for such an engine consists of four steps: (A) isothermal expansion at the hot reservoir temperature, Th, (B) isochoric (constant volume) heat rejection to a regenerative heat exchanger, (C) isothermal compression at the cold reservioir temperature Te, and (D) isochoric heat absorption from the regenerative heat exchanger back to the initial state.
Please help me .. answer my Question , I don't want to quote or plagiarize, don't use your handwriting just use MS Word . Question (b)
A hole is to be punched out of a plate having a shearing strength of 50 ksi. The compressive stress in the punch is limited to 63 ksi. (a) Compute the maximum thickness of plate in which a hole 6 cm in diameter can be punched.(b) If the plate is 1 cm thick, determine the diameter of the smallest hole that can be punched.