For two heat exchangers under similar conditions except that one is cross flow and the other one is parallel flow, the amount of heat transfer of the cross flow heat exchanger should be higher than that of the parallel flow heat exchanger, for a given heat transfer area. Select one: O True O False In a condenser, the driving force of the heat transfer process is the fluid velocity. Select one: O True O False Heating a fluid flowing inside a closed circular conduit or pipe is the most important conductive heat-transfer process industry. Select one:

For two heat exchangers under similar conditions except that one is cross flow and the other one is parallel flow, the amount of heat transfer of the cross flow heat exchanger should be higher than that of the parallel flow heat exchanger, for a given heat transfer area. Select one: O True O False In a condenser, the driving force of the heat transfer process is the fluid velocity. Select one: O True O False Heating a fluid flowing inside a closed circular conduit or pipe is the most important conductive heat-transfer process industry. Select one:

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.41P

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Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.
1.Across-flow exchangerwith both fluids unmixedand an airflow rate of 0.5 kg/s on bothsides. The hot air enters at 350oC while thecool air enters at 20oC. Calculate the exit temperatures for U = 60 W/m2· oC anda total exchanger area of 15 m2.What would be the exittemperatures if the flow rates were cut in half, assuming no change in U? What if the flow rates weredoubled? 2.The shell fluid,ethylene glycol, enters at 120oC and leaves at 60oCwitha flow rate of 4000 kg/h. Water flows in the tubes, entering at 35oCand leaving at85oC. The overall heat-transfer coefficient for this arrangement is 900W/m2·oC.The exchanger is a shell tube with two shell passes and two tube passes.Calculate the following: a) The water exit temperature if flow rate of glycol to the exchanger is reduced in half with the entrance temperatures of both fluids remaining the same and by how much is the heat-transfer rate reduced?; b) The percentage reduction of heat transfer if water-flow rate is reduced by…
1. Across-flow exchangerwith both fluids unmixedand an airflow rate of 0.5 kg/s on bothsides. The hot air enters at 350oC while thecool air enters at 20oC. Calculate the exit temperatures for U = 60 W/m2· oC anda total exchanger area of 15 m2.What would be the exittemperatures if the flow rates were cut in half, assuming no change in U? What if the flow rates weredoubled? 2. The shell fluid,ethylene glycol, enters at 120oC and leaves at 60oCwitha flow rate of 4000 kg/h. Water flows in the tubes, entering at 35oCand leaving at85oC. The overall heat-transfer coefficient for this arrangement is 900W/m2·oC.The exchanger is a shell tube with two shell passes and two tube passes.Calculate the following: a) The water exit temperature if flow rate of glycol to the exchanger is reduced in half with the entrance temperatures of both fluids remaining the same and by how much is the heat-transfer rate reduced?; b) The percentage reduction of heat transfer if water-flow rate is reduced by…
For phase-free heat transfer and turbulent flow on both sides of a tube-boiler type heat exchanger, how the heat transfer coefficient on the boiler side will change with 50% increase in mass flow rate and how the heat transfer coefficient on the tube side is affected by 50% increase in mass flow rate (without using numerical values. ) display mathematically