A 2-m long thin walled concentric heat exchanger is used to dissipate heat from hot engine oil using water. The heat exchanger has inner tube of 50 mm diameter and an outer tube of 100 mm diameter. Engine oil enters the inner tube with temperature of 400 K while water flows in the annular region between the tubes at temperature of 27°C. It is desirable that the heat

A 2-m long thin walled concentric heat exchanger is used to dissipate heat from hot engine oil using water. The heat exchanger has inner tube of 50 mm diameter and an outer tube of 100 mm diameter. Engine oil enters the inner tube with temperature of 400 K while water flows in the annular region between the tubes at temperature of 27°C. It is desirable that the heat

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 10.18P

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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.
10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.
6.1 Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is , the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is . Consider the following fluids: (a) air, (b) hydrogen, and (c) water.
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Engine oil at 20°C is to be heated to a temperature of 60°C by saturated steam at 1 atm in a double-pipe heat exchanger. The inner and outer diameters of the annular space are 4 cm and 6 cm, respectively, and engine oil enters the inner tube with a mean velocity of 0.8 m/s. The inner tube surface may be assumed to be isothermal at 100°C, and the outer tube is well insulated. Assuming fully developed Poiseulle flow for oil, determine the rate of heat transfer to the oil from the tube surface and find the tube length required to heat the oil to the indicated temperature using the empirical relations associated with convection heat transfer.
The condenser of a large thermal power plant is a body-tube type heat exchanger consisting of a single body and 30000 pipes with two passes each. The pipes are thin-walled with an inner diameter of 25 mm, and steam condenses on the outer surfaces of the pipes with a convection coefficient of 11000 W / m2.K. The heat transfer required by the heat exchanger is 2000 MW, and it is provided by the flow of water through the pipes at a flow rate of 30000 kg / h. Water enters at 20 ° C, steam condenses at 50 ° C. Calculate the temperature of the cooling water leaving the condenser? Determine the required pipe length per pass? The properties of water at Tort = 300 K; Cp = 4180 j / kgK, μ = 855 × 10--6 Ns / m2, k = 0.613 W / mK, Pr = 5.83.