Engineering, 11.02.2020 18:19 mnaiachickadee

In subsea oil and natural gas production, hydrocarbon fluids may leave the reservoir with a temperature of 70°C and flow in subsea surrounding of 5°C. As a result of the temperature difference between the reservoir and the subsea surrounding, the knowledge of heat transfer is critical to prevent gas hydrate and wax deposition blockages. Consider a subsea pipeline with inner diameter of 0.5 m and wall thickness of 8 mm is used for transporting liquid hydrocarbon at an average temperature of 70°C, and the average convection heat transfer coefficient on the inner pipeline surface is estimated to be 250 W/m^2 K. The subsea surrounding has a temperature of 5°C and the average convection heat transfer coefficient on the outer pipeline surface is estimated to be 150 W/m^2 K. If the pipeline is made of material with thermal conductivity of 60 W/m K, by using the heat conduction equation.

a. Obtain the temperature Variation in the pipeline wall.
b. Determine the inner surface temperature of the pipeline.
c. Obtain the mathematical expression for the rate of heat loss from the liquid hydrocarbon in the pipeline.
d. Determine the heat flux through the outer pipeline surface.

Answers: 3

Show answers

Another question on Engineering

Engineering, 03.07.2019 19:30

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

Answers: 3

Answer

Engineering, 04.07.2019 18:20

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Answers: 1

Answer

Engineering, 04.07.2019 18:20

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

Answers: 3

Answer

Engineering, 04.07.2019 18:20

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.

Answers: 3

Answer

You know the right answer?

In subsea oil and natural gas production, hydrocarbon fluids may leave the reservoir with a temperat...

Questions