Water is heated from 80°C to 150°C in a shell and tube heat exchanger with a total surface area of 824 m". Hot exhaust gases enter at 350°C and exit at 175°C, Determine the overall heat transfer coefficient (W/m".K) when the amount of heat transfer is 2.7 MJ? Use correction factor = 0.90 for heat exchanger. %3D

Water is heated from 80°C to 150°C in a shell and tube heat exchanger with a total surface area of 824 m". Hot exhaust gases enter at 350°C and exit at 175°C, Determine the overall heat transfer coefficient (W/m".K) when the amount of heat transfer is 2.7 MJ? Use correction factor = 0.90 for heat exchanger. %3D

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.3P: 6.3 Steam at 100 kPa and is flowing across a 5-cm- OD tube at a velocity of 6 m/s. Estimate the...

See similar textbooks

Similar questions

7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?
6.3 Steam at 100 kPa and is flowing across a 5-cm- OD tube at a velocity of 6 m/s. Estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at .
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.
What are baffles? Why we use baffles in heat exchangers?
How does a cross-flow heat exchanger differ from a counter-flow one? What is the difference between mixed and unmixed fluids in cross-flow?
Steam is to be condensed on the shell side of a 1-shellpass and 8-tube-passes condenser, with 50 tubes in each pass,at 308C (hfg 5 2431 kJ/kg). Cooling water (cp 5 4180 J/kg?K)enters the tubes at 158C at a rate of 1800 kg/h. The tubes arethin-walled, and have a diameter of 1.5 cm and length of 2 mper pass. If the overall heat transfer coefficient is 3000 W/m2?K,determine (a) the rate of heat transfer and (b) the rate of condensation of steam.
A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42. The tubes are of 14 mm inside diameter, 16 mm outside diameter and 4 m length. The overall heat transfer coefficient is 3510 kJ/hr-m2 -°C. Cooling water enters the condenser at 25°C at a velocity of 1.5 m/s and leaves with a temperature rise of 6.5°C. (a) Calculate the outside heating surface area of the tubes in m2 ; (b) Determine the mass flow rate of water in kg/s and the volumetric flow rate in L/s (using an average density of 996.5 kg/m3 ); (c) Estimate the condensing temperature of the refrigerant; (d) If the ammonia refrigerant enters and leaves the condenser at saturation conditions, compute the mass flow rate of the refrigerant and the condenser pressure in kPa.
Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance?
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.
Explain how the maximum possible heat transfer rate ???? in a heat exchanger can be determined when the mass flow rates, specific heats, and the inlet temperatures of the two fluids are specified. Does the value of Q.max depend on the type of the heat exchanger?
Saturated water vapor at 100°C condenses in the shell side of a one-shell and two-tube heat exchanger with a surface area of 0.5 m2 and an overall heat transfer coefficient of 2000 W/m2·K. Cold water (cpc = 4179 J/kg·K) flowing at 0.5 kg/s enters the tube side at 15°C, determine the outlet temperature of the cold water and the heat transfer rate for the heat exchanger.
What is application of parallel flow heat exchanger? and counter flow heat exchanger?