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
Bad White [126]
3 years ago
5

Consider a heat pump that operates on the reversed Carnot cycle with R-134a as the working fluid executed under the saturation d

ome between the pressure limits of 140 and 800 kPa. R-134a changes from saturated vapor to saturated liquid during the heat-rejection process. The net work input for this cycle is ____
Physics
1 answer:
Schach [20]3 years ago
8 0

Answer:

Work out = 28.27 kJ/kg

Explanation:

For R-134a, from the saturated tables at 800 kPa, we get

h_{fg} = 171.82 kJ/kg

Therefore, at saturation pressure 140 kPa, saturation temperature is

T_{L} = -18.77°C = 254.23 K

At saturation pressure  800 kPa, the saturation temperature is

T_{H} = 31.31°C = 304.31 K

Now heat rejected will be same as enthalpy during vaporization since heat is rejected from saturated vapour state to saturated liquid state.

Thus, q_{reject} = h_{fg} = 171.82 kJ/kg

We know COP of heat pump

COP = \frac{T_{H}}{T_{H}-T_{L}}

        = \frac{304.31}{304.31-254.23}

         = 6.076

Therefore, Work out put, W = \frac{q_{reject}}{COP}

                                              = 171.82 / 6.076

                                              = 28.27 kJ/kg

You might be interested in
A quarterback claims that he can throw the football a horizontal distance of 167 m. Furthermore, he claims that he can do this b
pychu [463]

Answer:u=42.29 m/s

Explanation:

Given

Horizontal distance=167 m

launch angle=33.1^{\circ}

Let u be the initial speed of ball

Range=\frac{u^2\sin 2\theta }{g}

167=\frac{u^2\sin (66.2)}{9.8}

u^2=1788.71

u=\sqrt{1788.71}

u=42.29 m/s

7 0
2 years ago
What are some problems associated with the introduction of an exotic species into an ecosystem?
vodomira [7]
People in public getting killed
5 0
3 years ago
Read 2 more answers
Which is the appropriate unit of measurement for pitch?
malfutka [58]
Hertz Pitch and frequency
6 0
2 years ago
PLZ HELP!!!!!!!
kifflom [539]
<span>Match the basic components of a nuclear reactor with their descriptions. 1. slows down neutrons moderator - This is the substance that slows down fast neutrons and makes them slow neutrons which are easier to capture by the atomic nuclei so that the fission reaction can continue. 2. absorb emitted neutrons control rods - These are rods made up of a substance that easily absorbs neutrons. Their purpose is to slow down or shut down the reaction. 3. mass of unstable atoms nuclear fuel - The entire point of a nuclear reactor is the capture the energy released by the fission of unstable atoms. So this mass of unstable atoms is the fuel for the nuclear reactor. 4. concrete and lead enclosure shield - This is the enclosure that prevents radiation from escaping into the general environment. 5. energy transfer medium coolant - Since the purpose of a nuclear reactor is to generate usable energy, the coolant extracts heat from the fissioning core and that heat is generally used to boil water which in turn is used to operate turbines that power electrical generators.</span>
3 0
3 years ago
Read 2 more answers
Some people will realize that they are dreaming while the dream is happening this is called
algol [13]

Answer:

C. Lucid Dreaming

6 0
2 years ago
Other questions:
  • A steel cable 1.25 in. in diameter and 50 ft long is to lift a 20-ton load without permanently deforming. What is the length of
    13·1 answer
  • 1 every 30,000 miles, __________. replace the brakes vacuum the interior service the automatic transmission (if your car has one
    8·2 answers
  • Light traveling in a medium of index of refraction n1 is incident on another medium having an index of refraction n2. Under whic
    12·1 answer
  • A 150-kg object takes 1.5 minutes to travel a 2,500- meter straight path. It begins the trip traveling 120 m/s and decelerates t
    7·1 answer
  • A bowling ball has a mass of 5 kg. What happens to its momentum when its speed increases from 1 m/s to 2 m/s?
    12·1 answer
  • A beam of protons moves in a circle of radius 0.20 m. The protons move perpendicular to a 0.36-T magnetic field. (a) What is the
    10·1 answer
  • What is threshold of hearing?
    12·1 answer
  • What is characteristic of a good insulator?
    5·2 answers
  • What would be a disadvantage of asexual reproduction for an organism
    15·1 answer
  • Technician A says that cabin filters are accessible behind the glove compartment. Technician B says that cabin filters are acces
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!