How Much Power Does a Pump Need to Move Water Adiabatically?

  • Thread starter Thread starter Jack Easton
  • Start date Start date
  • Tags Tags
    Thermodynamics
AI Thread Summary
To determine the power required by a pump to move water adiabatically, the steady flow energy equation must be applied. The scenario involves a pump moving water with a mass flow rate of 3.1 kg/s through a 120 mm diameter pipe, lifting it 3 meters vertically from a pressure of 100 kPa at 18℃ to atmospheric pressure. The process is assumed to be adiabatic and frictionless. Calculating the power involves considering the energy needed to overcome gravitational potential energy and any changes in pressure. The discussion emphasizes the need for a clear application of the steady flow energy equation to solve the problem effectively.
Jack Easton
Messages
3
Reaction score
0
HOMEWORK PROBLEMS REQUIRE USE OF HOMEWORK TEMPLATE. THIS WAS ORIGINALLY POSTED IN WRONG FORUM.
I have been struggling with this question for a while, please could somebody help?
A pump is used to move water through a short pipe of diameter 120 mm as shown in Figure Q2. The water has a temperature of 18℃ and a pressure of 100 kPa (Absolute). The pump moves the water up a vertical distance of 3 m and the water exits to atmospheric pressure. Assuming the process is adiabatic and frictionless, and the required mass flow rate is 3.1 kg/s, determine, using the steady flow energy equation, the power required by the pump.

thanks
 
Physics news on Phys.org
Is there a Figure Q2 which can be posted?
 
this is figure Q2
 

Attachments

  • Screen Shot 2015-06-20 at 19.17.30.png
    Screen Shot 2015-06-20 at 19.17.30.png
    5 KB · Views: 473
Jack Easton said:
I have been struggling with this question for a while, please could somebody help?

A pump is used to move water through a short pipe of diameter 120 mm as shown in Figure Q2. The water has a temperature of 18℃ and a pressure of 100 kPa (Absolute). The pump moves the water up a vertical distance of 3 m and the water exits to atmospheric pressure. Assuming the process is adiabatic and frictionless, and the required mass flow rate is 3.1 kg/s, determine, using the steady flow energy equation, the power required by the pump.

thanks

Have you written the steady flow energy equation for this system?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Using the steady flow energy equation, find the power required
Replies
11
Views
4K
Adiabatic compressed air and energy calculations
2
Replies
60
Views
7K
Pressure of water exiting a hole in PVC
Replies
12
Views
3K
How Much Power Does a Pump Need to Move Water from a Deep Hole?
Replies
2
Views
2K
How Does a Pump Calculate Work When Transitioning from Water to Air Underwater?
Replies
2
Views
3K
Power to raise water from point A to B
Replies
10
Views
2K
How Much Force is Needed to Hold a Hose Emitting Water at 20 m/s?
Replies
8
Views
4K
Force due to a submersible water pump to move an underwater vehicle
Replies
1
Views
3K
How Does Adiabatic Compression Affect Steam and Water Mixtures?
Replies
7
Views
5K
How to calculate (pump) power to maintain a static head?
Replies
6
Views
3K

Hot Threads

Recent Insights

Back
Top