A DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexane that has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F and flowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steel inner pipe is 9.5 Btu/h·ft·°F. Determine the following: a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F). b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F). c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).

A DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexane that has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F and flowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steel inner pipe is 9.5 Btu/h·ft·°F. Determine the following: a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F). b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F). c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).

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 6.53P

See similar textbooks

Similar questions

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 .
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.
QS: Water at 15.56°C i to be heated in a 2-mm-ID tube until the exit temperature reaches 26.67+C. The tube wall temperature is maintained at 48.99-C and the inlet flow velocity is 0.3 m/s. Calculate the length of tube required in meters to accomplish this heating. Also calculate the total heating required, expressed in watts. Answers: L=0.13 m
Determine the transfer coefficient for water flowing through a 1-inch pipe.inch, 16 BWG and 3 m / s, if the tube temperature is 82 ° C and the water enters at 21 ° C and exitsat 55 ° C
Oil whose temperature is constant at 20 ° C (ρ = 886 kg / m3, μ = 0.805 kg / m / s) It flows continuously and fully developed from its length. The pressure at the entrance of this 40 m length is 720 kPa, pressure at its outlet is measured as 101 kPa. Flow is laminar. Volume flow rates, average velocities, Reynolds numbers and Darcy friction factors a-That the pipe is horizontal b-The pipe makes 20 ° counterclockwise with the horizontal c-The pipe makes 15 ° clockwise with the horizontal. Calculate for situations.
Is the Fanning friction factor is a function of the pipe’s roughness in the turbulent flow regime.
A two pass steam surface condenser is to be designed to condense 10000 kg/hr of steam having an enthalpy of 2240 kj/kg. Condenser pressure is 13.79 kpa. circulating water enters the condenser at 25 C and leaves at 40 C. the outside and inside diameter for a water tube, OD=20 mm, ID = 17 mm and water velocity of 3 m/s. if the overall coefficient of the heat transfer is 14100 kj/hr-m-C of outside tube surface, determine the amount of circulating water in m/hr.
Below is the velocity profile across the radius of the tube. n =1 is for Newtonian fluid and n<1 is for shear-thinning fluid. Show how the velocity profile in the tubes differs between the fluids.
Determine the expected Fanning friction factor for water at 28 degrees Celsius flowing through a smooth tube whose ID is 15mm, at a velocity of 0.45 m/s
Determine the expected Fanning friction factor for water at 28 degrees Celsius, flowing through a smooth tube with a ID of 15 mm at a velocity of 0.3 m/s.
Need help with the following questionA reducing elbow in a horizontal pipe is used to deflect water by an angle of110° from the flow direction while accelerating it. Hot water at 80°C flowsat a rate of 33 kg/s in the pipe. The elbow discharges water into theatmosphere. The cross-sectional area of the elbow is 150 cm2at the inlet and25 cm2at the outlet. The elevation difference between the entrance and theexit of the pipe is 40cm. The total mass of the elbow and water in it is 50kg.Take the momentum-flux correction factor to be 1.03 at both inlet and outlet.Determine : -The inlet and outlet water velocities. -The gage pressure at the center of the inlet of the elbow. -The anchoring force required to hold the elbow in place.
Flow Characteristics (Entrance Effect) -Why is the Δ P/ L Line extrapolated to the tube entrance for the calculation of the entrance loss coefficient, KL ?