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
lora16 [44]
3 years ago
10

Water is the working fluid in an ideal Rankine cycle. Superheatedvapor enters the turbine at 10MPa, 480°C, and the condenser pre

ssure is6 kPa. Isentropic efficiencies of the turbine and pump are 80% and 75%,respectively. Determine for the cyclea.the actual heat transfer to the working fluid passing through thesteam generator, in kJ per kg of steam flowing.b.the thermal efficiency.c.the actual heat transfer from the working fluid passing through thecondenser to the cooling water, in kJ per kg of steam flowing
Engineering
1 answer:
choli [55]3 years ago
6 0

Answer:

Explanation:

Given that:

Superheated vapor enters the turbine at 10 MPa, 480°C,

From the tables of superheated steam tables; the following values are obtained

h_1 = 3322.02 \ kJ/kg\\\\ s_1 = 6.52846 \ kJ/kg.K

Also; from the system, the isentropic line is 1-2 in which s_2 is in wet state

s_2 = s_{f \ 6 kpa} +xs_{fg \ 6 kpa}

s_2 =0.51624 + x(7.82)

s_2 =0.51624 + 7.82x

From the values obtained;

s_1 =s_2= 6.52846 \ kJ/kg.K

Therefore;

6.52846 = 0.51624+7.82x

6.52846 - 0.51624 = 7.82 x

6.01222  = 7.82 x

x = 6.01222/7.82

x = 0.7688

The enthalpy for this process at state (s_2) can be determined as follows:

h_2 = h _f +xh_{fg} \\ \\ h_2 = 150.15 +(0.77 \times 2415.92) \\ \\ h_2 =150.15 +( 1629.2584 )  \\ \\ h_2 =2010.4084   \ kJ/kg

The actual enthalpy at s_2 by using the isentropic efficiency of the turbine can determined by using the expression:

n_T = \dfrac{h_1-h_{2a}}{h_1-h_2}

0.8 = \dfrac{3322.02-h_{2a}}{3322.02-2010.4084}

0.8 = \dfrac{3322.02-h_{2a}}{1311.6116}

0.8 * {1311.6116}= {3322.02-h_{2a}

1049.28928=  {3322.02-h_{2a}

h_{2a}=   {3322.02- 1049.28928

h_{2a}=   2272.73072 kJ/kg

The work pump is calculated by applying the formula:

w_p = v_{f  \  6 kpa} (p_4-p_3)

w_p = 0.0010062 * (10000-6)

w_p = 0.0010062 *9994

w_p = 10.0559628 \  kJ/kg

However;

w_p = h_4 -h_3

From the process;

h_3 = h_{f(6 kpa)} = 150.15 \  kJ/kg

10.0559628 = h_4 - 150.15

10.0559628+  150.15 = h_4

160.2059628= h_4

h_4= 160.2059628 \  kJ/kg

The actual enthalpy at s_4 by using the isentropic efficiency of the turbine can determined by using the expression:

n_P = \dfrac{h_4-h_{3}}{h_{4a}-h_3}

You might be interested in
Select the correct answer.
juin [17]
Orthographic projection, common method of representing three-dimensional objects, usually by three two-dimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawling.
4 0
3 years ago
What steps might one take to make a decision or solve a problem
marusya05 [52]

you must think and plan out what you want to do

8 0
3 years ago
Read 2 more answers
A slender rod AB, of weight W, is attached to blocks A and B, which move freely in the guides shown. The blocks are connected by
gregori [183]

Answer:

(a) T = W/2(1-tanθ)  (b) 39.81°

Explanation:

(a) The equation for tension (T) can be derived by considering the summation of moment in the clockwise direction. Thus:

Summation of moment in clockwise direction is equivalent to zero. Therefore,

T*l*(sinθ) + W*(l/2)*cosθ - T*l*cosθ = 0

T*l*(cosθ - sinθ) = W*(l/2)*cosθ

T = W*cosθ/2(cosθ - sinθ)

Dividing both the numerator and denominator by cosθ, we have:

T = [W*cosθ/cosθ]/2[(cosθ - sinθ)/cosθ] = W/2(1-tanθ)

(b) If T = 3W, then:

3W = W/2(1-tanθ),

Further simplification and rearrangement lead to:

1 - tanθ = 1/6

tanθ = 1 - (1/6) = 5/6

θ = tan^(-1) 5/6 = 39.81°

8 0
3 years ago
The B-pillar may also be called the:
slega [8]

Answer:

if you're talking about the car b-post, the answer is "posts"

Explanation:

looked it up

6 0
3 years ago
A section of a two-lane highway has 12-ft lanes and a design speed of 75 mi/h. The section contains a vertical curve and a horiz
spayn [35]

Answer:

Explanation: see attachment below

6 0
3 years ago
Other questions:
  • Which of the following is an example of an iterative process?
    12·1 answer
  • What kind of volcano usually forms over a hot spot?
    15·2 answers
  • The news media often report an earthquake's magnitude on the Richter scale. Which of the following items are characteristics of
    14·1 answer
  • ____ technologies are new technologies that are not currently widely employed.
    15·2 answers
  • So far in your lifetime, about how much garbage have you contributed
    12·1 answer
  • You need to bake 2 dozen chocolate chip
    12·1 answer
  • In water and wastewater treatment processes a filtration device may be used to remove water from the sludge formed by a precipit
    10·1 answer
  • The ruler game, HELPPPP PLS
    11·2 answers
  • Quelles sont les types de carburant utilisés en aviation
    15·1 answer
  • As you push a toggle bolt into a wall, the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!