Engineering
Engineering, 16.09.2021 14:00, Ben2752

Problem #1: The first steam-driven 'heat engines' were single-cycle steam pipes used to lift water from the bottom of mine shafts. To operate the device, a long pipe closed at one end was filled with saturated steam at atmospheric pressure. Then the open end of the pipe was submerged in the liquid water at the bottom of the mine shaft. The steam inside the pipe would cool, reducing the pressure and drawing liquid water into the pipe. When thermal equilibrium was reached between the steam and surroundings, the liquid water raised in the pipe was removed. Closed End D Final State 2 TI Initial State! Sat. Vapor L Liquid Water Surface Open End Assume that the atmospheric conditions in the mine are Tg = 50 °F and 14.696 pisa. The steam lift pipe has dimensions of length L = 40 ft and diameter D=2 ft. The pipe is initially filled with saturated steam at atmospheric pressure. The steam cools, lifting the liquid water to height 'h' at which point the steam reaches thermal equilibrium with the surroundings. For this process determine:a) the final pressure of the condensed steam (psia),b) the rise 'h' of liquid water in the lift pipe (ft),c) the amount of heat transferred from the condensed steam in the cooling process (Btu),d) the entropy generation that occurs in the cooling process (Btu/R). If liquid water from the mine is boiled to produce the steam that initially fills the lift pipe, e) how much heat is required (Btu)? If there is a difference between the values for parts c) and e), explain the reason for the difference.

answer
Answers: 3

Other questions on the subject: Engineering

image
Engineering, 04.07.2019 18:10, xboxdude06
Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.
Answers: 1
image
Engineering, 04.07.2019 18:20, maciemarklin79981
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
image
Engineering, 04.07.2019 18:20, rocio5649
Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa. s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)
Answers: 3
image
Engineering, 04.07.2019 19:10, shunna33
Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?
Answers: 2
Do you know the correct answer?
Problem #1: The first steam-driven 'heat engines' were single-cycle steam pipes used to lift water f...

Questions in other subjects: