1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nikitadnepr [17]
3 years ago
11

Three return steam lines in a chemical processing plan enter a collection tank operating at a steady state at 1 bar. Steam enter

s inlet 1 with flow rate of 0.8 kg/s and a quality of 0.9. Steam enters inlet 2 with flow rate of 2kg/s at 200 degrees C. Steam enters inlet 3 with flow rate 1.2 kg/s at 95 degrees C. Steam exits the tank at 1 bar. The rate of heat transfer from the collection tank is 40 kW. Neglecting kinetic and potential energy effects, determine for the steam exiting the tank:(a)Mass flow rate in kg/s (b) the temperature in degrees C.
Engineering
1 answer:
gavmur [86]3 years ago
4 0

Answer:

a. 4kg/s

b. 99.97 °C

Explanation:

Hello,

a. The resulting mass balance turns out into:

F_1+F_2+F_3=F_{out}\\F_{out}=0.8kg/s+2kg/s+1.2kg/s=4kg/s

b. Now, the energy balance is:

F_1h_1+F_2h_2+F_3h_3-Q_{out}=F_{out}h_{out}

In such a way, the first enthalpy is taken as a liquid-vapor mixture at 1 bar and 0.9 quality, it means:

h_1=hf(1bar)+xhfg(1bar)\\h_1=419.06kJ/kg+0.9*2256.5kJ/kg=2449.91kJ/kg

Second enthalpy is taken by identifying that stream as an overheated vapor at 1 bar and 200 °C, thus, the resulting enthalpy is:

h_2=2875.5kJ/kg

Then, the third enthalpy is taken by considering that at 95°C and 1 bar the water is a saturated liquid, thus:

h_3=hf(95^0C)=398.09kJ/kg.

Now, by solving for h_{out}, we've got:

h_{out}=\frac{0.8kg/s*2449.91kJ/kg+2kg/s*2875.5kJ/kg+1.2kg/s*398.09kJ/kg-40kW}{4kg/s} \\h_{out}=\frac{8148.612kJ/s}{4kg/s} \\h_{out}=2037.153kJ/kg

Finally, by searching for that value of enthalpy, one sees that at 1 bar, the exiting stream is a liquid-vapor mixture that is at 99.97 °C and has a 72%- quality.

(NOTE: all the data was extracted from Cengel's book 7th edition).

Best regards.

You might be interested in
What do we need to travel farther distances in space
kakasveta [241]

Answer

Definitely a

Explanation:

Because OK yes the space suit is necessary and everything but u can't get to space without the shuttle

6 0
2 years ago
Read 2 more answers
The compressed-air tank has an inner radius r and uniform wall thickness t. The gage pressure inside the tank is p and the centr
Sedaia [141]

Answer:

Explanation:

Given that:

The Inside pressure (p) = 1402 kPa

= 1.402 × 10³ Pa

Force (F) = 13 kN

= 13 × 10³ N

Thickness (t) = 18 mm

= 18 × 10⁻³ m

Radius (r) = 306 mm

= 306 × 10⁻³ m

Suppose we choose the tensile stress to be (+ve) and the compressive stress to be (-ve)

Then;

the state of the plane stress can be expressed as follows:

(\sigma_ x)  = \dfrac{Pd}{4t}+ \dfrac{F}{2 \pi rt}

Since d = 2r

Then:

(\sigma_ x)  = \dfrac{Pr}{2t}+ \dfrac{F}{2 \pi rt}

(\sigma_ x)  = \dfrac{1402 \times 306 \times 10^3}{2(18)}+ \dfrac{13 \times 10^3}{2 \pi \times 306\times 18 \times 10^{-3} \times 10^{-3}}

(\sigma_ x)  = \dfrac{429012000}{36}+ \dfrac{13000}{34607.78467}

(\sigma_ x)  = 11917000.38

(\sigma_ x)  = 11.917 \times 10^6 \ Pa

(\sigma_ x)  = 11.917 \ MPa

\sigma_y = \dfrac{pd}{2t} \\ \\ \sigma_y = \dfrac{pr}{t} \\ \\  \sigma _y = \dfrac{1402\times 10^3 \times 306}{18} \ N/m^2 \\ \\ \sigma _y = 23.834 \times 10^6 \ Pa \\ \\ \sigma_y = 23.834 \ MPa

When we take a look at the surface of the circular cylinder parabolic variation, the shear stress is zero.

Thus;

\tau _{xy} =0

3 0
3 years ago
When calculating gear ratios, which formula is different from the others?
BartSMP [9]

Answer:

The number of threads in a worm is the number of teeth in a worm. The speed transmission ratio of a worm and worm gear set is obtained by dividing the number of teeth of the worm gear by the number of threads of the worm.

6 0
3 years ago
How can I solve this sequence problem?​
Vinvika [58]

Answer:

Podes  hablar en español?

Explanation:

8 0
3 years ago
Read 2 more answers
1. A piston having a diameter of 5.48 inches and a length of 9.50 in slides downward with a velocity, V, through a vertical pipe
const2013 [10]

Answer:

V = 0.00459 ft/s  

Explanation:

Since the Piston is moving downwards with a constant velocity V, from the first Newton’s law we know that all vertical forces, must have zero resultant (their sum over vertical axis must equal to zero). Therefore, force that pulls the piston down, is equalized by force of viscous friction Fd= Fvf = 0.5lb (lb here is the pound-force unit). We will relate F ѵ f  with τ and from that derive the equation for V.

Fѵf = τ  . A

Where τ  = µ. du/dy = µ . V/b  , and A = π . D . l from this Follows:

Fѵf= (V.  A .µ )/b     V= ( Fѵf .b )/(A.µ)    

Placing all the known values in the equation ( remember  to transform inches to feet, by multiplying inches values with the factor 1/12), we obtain :  

ft2

V = ((0.5lb)   .   (0.002/12 ft))/(π   .   (5.48/12 ft)  .  (9.50/12 ft)  .  (0.016 lb.s/(ft^2 )))

V = 0.00459 ft/s  

Download docx
3 0
3 years ago
Other questions:
  • Mr.Haussman has 17 students in his class
    14·2 answers
  • Steam at 1 MPa, 300 C flows through a 30 cm diameter pipe with an average velocity of 10 m/s. The mass flow rate of this steam i
    13·1 answer
  • A contractor is planning on including several skylights in each unit of a residential development. What type of worker would she
    12·1 answer
  • The increasing interconnections of peoples and countries around the world is known as ________.
    14·2 answers
  • Determine the average and rms values for the function, y(t)=25+10sino it over the time periods (a) 0 to 0.1 sec and (b) 0 to 1/3
    9·1 answer
  • A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 5.6 mm; the spe
    8·1 answer
  • A completely reversible heat pump produces heat ata rate of 300 kW to warm a house maintained at 24°C. Theexterior air, which is
    6·1 answer
  • An Otto cycle with air as the working fluid has a compression ratio of 8.2. Under cold air standard conditions, what is the ther
    14·1 answer
  • I will mark as brainliest !
    10·1 answer
  • How can feeding plant crops to animals be considered an efficient use of those crops?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!