Pump Definition and 655 Threads

Homework Statement Consider a heat pump used to heat a house to 70°F when the outside temp is 5°F. The total heat loss from the house is 10000 BTU/hr. Efficiency of the heat pump is 45% of the theoretical maximum. What will be the power used by the pump? Homework Equations e (or cop) =...

hi to all, i have been trying to find some similar project solution on the internet but so far have found nothing, so i am posting here. here is the setup ( see attached picture) : in "fig 1" a metal chamber, perfectly sealed contains inside it a balloon filled with air (red color). the...

Homework Statement A pump is on a line. the data are: P1=-0.4[bar] \gamma=0.8\cdot104[N/m3] V1=3[m/s] \frac{D_1}{D_2}=1.4 HP=30[m] (head of pump) See attached drawing. Homework Equations Bernoulli equation: H_1+\frac{V_1^2}{2g}+\frac{P_1}{\gamma}+H_P=H_2+ \frac{V_2^2}{2g}...

hi i have a problem i have a motor 100hp and constant 2500rpm i need to connect to him hydraulic pump, that will rotate hydraulic motors connected to the wheels. i need to get about 80 N*m on each wheel how to solve this problem? what formulas i need? thank!

Hello everyone, I'm new here, sorry if it's off topic. I need to buy high pressure pump and was asked by supplier these questions. I'm a sales person and physics is not my very strong side :( I've got some answers on it (posted below questions). How can I calculate question 6? If it's...

This is a high school work/power problem that I'm struggling with: An electric pump is used to pump water from a 40m deep hole to the surface. If 1200kg of water is needed every 2 minutes and the water is released at 12 ms-1 at the surface, what should the minimum power of the pump be...

hi everyone In order to calculate the thrust force of a jet pump , what must I know and what is the formula used? thanks :)

Hello, When selecting a pump one should calculate the flow rate of the building supplied. To determine the building's supply one should select the longest piping distance and the the area where the most flow is required, right? or it can be multiple areas «, or one should select all the areas...

I'm going a bit off the reservation to try something experimental when I attempt my own HVAC installation and I'm having some trouble determining a few things. I want to transfer heat from water flowing in a 3/4" copper tube that is submersed in a larger body of water. The copper pipe has a...

Hi all, I have a peristaltic pump that i need to rotate at 26 rev/min. The gear arrangement attached to the pump is calculated at 13.1:1 therefore I am assuming an input speed of 340rev/min is required to produce a reduction in speed to the desired output of 26 rev/min. Gear A (1st...

Hello. I am writing a relatively simple simulation code for looking at transient temperatures in a surge tank, which reflects a real-world system. The tank is hooked up to a recirculation loop with a pump and a heat exchanger. The pump has an average flowrate of 500 GPM. Despite the...

All, I am an engineer that occasionally needs to modify or rework circuit boards. I have a hot air rework station that uses a diaphragm pump to push air through a heating element. The result is air up to 550 degrees celcius. I can effectively rework most circuit boards. Unfortunately the...

Dear All, Appreciate if you can guide me on understanding the ultimate pressure of vacuum pump. I have two models for review. One has ultimate pressure of 1 x 10^-4Torr the other has 2 x 10^-3Torr. From this can it be said that the vacuum capability of the first pump (1 x 10^-4)...

Hi, In the next week I am going to NPL for physics academy and I will be designing and building a prototype electron pump. I've tried to look for articles or books related to electron pumps or how to build them but I simply can't find anything at all. Does anyone have any material at...

I have a 12v DC (rotary vane type) pump that is connected to a 12v auxillary battery. The battery is 12vDC 70Ah and it charges itself with the truck's alternator, which is 12 volts, 35 amps. the pump is 1/4 hp, and it draws 20 amps max. The problem is, the discharge output of the pump is very...

Hi all. This is my first post so please forgive me if I write anything wrong or post on wrong forum. In the attachment below I have a problem. I need to buy a water pump (PUMPA in img) that works on 12 or 24 volt DC current being powered with solar panels. This pump must be able to fill a...

A PUMP OF 0.25HP IS CONNECTED IN THE ABOVE FASHION (REF ATTACHMENT) TO THREE TANKS BY MEANS OF A SINGLE SUCTION PIPE. THE SINGLE SUCTION PIPE IS FURTHER BRANCHED TO THREE SUCTION PIPES, ONE EACH FOR THREE TANKS. THE DESIGN DISCHARGE CAPACITY OF THE PUMP IS APPROXIMATELY 45 LIT/MIN. BUT...

Homework Statement -4" hydraulic cylinder/piston -closing a floodgate 4" in diameter, must exert force F=30,000lb to do so. -Piston stroke is 2'. -Hydraulic fluid specific gravity of 0.9. -Pump efficiency of 0.8 Find A) the pressure on the floodgate and B) the horsepower of the pump...

two tanks were placed. tank one at a higher level and other(tank 2) at lower level. But in tank 2 a pump of flow rate Q ml/min is affixed.what is the flow rate in tank 2. Same as Q /min?

Centrifugal pump as turbine! Dear Friends, Francis turbine and centrifugal pump has got the same (reverse ofcourse) technologies rt. Have they both got the same manufacturing criterion? will centrifugal pumb, if used as a turbine, have the same efficiency as that of francis turbine?

This should be an easy one but here goes... I am trying to easily measure flow rate in a pipe which has an in line centrifugal pump (Grundfos UPS 25-60) creating the head in the system. I have been told that installing a pressure gauge before and directly after the pump will give me system...

Hi, I am trying to understand side stream filtration. Iv been finding it really hard to find out anything on preferential flow (multiphase) through a side stream using a valve to create a pressure drop (general info for my understanding) Im trying to do this without the need for a...

I need to select a pump that will remove all the salt water from the inside of a hollow driven pile. The pile 1500mm diameter and is 30m in length probably containing around 20m sea water. does anyone have any ideas on how i go about choosing the right pump for the job? I have no experience...

1. Pump used to deliver water at 20oC from a pond to center of large field located 100 m from the pond. The desired pump is expected to deliver a max flow rate of 380 L/min through 107 m of a 6 cm steel pipe having an equivalent sand roughness of 0.01mm. Water level in pond during irrigation...

Consider the vessel. It is filled to a depth of 1 foot of water. Write an integral in terms of y (the distance from the bottom) for the work required to pump all the water to the top of the vessel. Water weights 62.4 lbs/ft3. Relevant Equations W = ∫F dx Pressure = density * g * depth F =...

I am going crazy! These websites appear to contradict one another... The lowering of the diaphragm makes the inlet valve of the fuel pump open. With this valve open, fuel is drawn from the gas tank and into the pump. At the same time, the lowering of the diaphragm closes an outlet valve...

in college days it is known that if you want double pressure install the pumps in series if you need double flow install the pumps parallel. but in actual field i have two pumps installed in parallel in Sewer Pump Station one as on duty and the second one is assist. but while both pumps running...

Hi all I hope you can help me here. I am trying to model an elevated vat which is using gravity to supply water to a filler. The pipeline has filters and bends in it which lead to headlosses. The filler supplys a fixed volume of liquid to a bottle at set time intervals. The filler is...

Hi Guys, Been researching peristaltic pumps, but can't find an industry standard in designing them. Wiki (http://en.wikipedia.org/wiki/Peristaltic_pump) has a little bit of maths on the occlusion, and a basic idea on calculating the flow rate and this article explains a little of the theory...

I'm designing a bucket pump for a water well I'll be attaching a pumpjack to. I'm just a regular shop guy so I was kind of stumped on a question of how much upward pressure will be required to move the water up the drop pipe. If the pump cylinder is the same diameter of the drop pipe I figure...

Hello, I'm working on an invention in which I'm trying to build a prototype for. I have very little physics background and nothing in computers which is why I've sought help here. The project seems very basic, but I have no idea where to start. I need help hooking up two hygrometers...

http://img849.imageshack.us/img849/9018/curvess.jpg So pump curve, as flow increases, pressure drops. For the system curve, it's the other way around. How come? How come the pump disobeys the way the system is supposed to behave? The pump is a part of the system, and in the physical world...

The setup I have is a water pump, with a pipe out leading to a nozzle of some sort. I know the mass flow rate of the water through the pump, and wish to calculate the exit velocity of the water from the nozzle. Which other variables do I need to know? Also, what dictates the limit to the...

Hi everyone. I am having a slight issue with part of a question regarding an experiment that i had to do as part of my course. Basically we were calculating the coeficients and characteristics of a basic centrafugal pump. We used the pump to pump water round a simple system and recorded the...

Hello, I have recently started work as a researcher at a university investigating heat transfer fluids (HTF). One of the tasks is to build a pumping test rig to simulate plant conditions. One of the fluids being tested is a eutectic mix of biphenyl and diphenyl oxide which is similar in density...

Homework Statement I have attached the question with a diagram and answer key. The Attempt at a Solution What I did was found the work needed to pump the water into the bottom half of the sphere from 90-100 and then add that to the work needed to pump the water into the top half of the...

Homework Statement I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use Homework Equations [b]3. The Attempt at a Solution [/b} Uh I just trying 2 figure out the concept so Idk how 2...

Does the local pressure lost endured in an entrance to a container (k =1) equal to the same local pressure lost of an entrance to a hydraulic Centrifugal pump (in basic hydraulic with mostly ideal conditions - neglecting friction). Or do we ignore it as local pressure lost?

Hi all, I was recently given a project at my college intership where I am supposed to model a mechanical singe vane rotary vacuum pump mathematically. The objective of the analysis is to find the work required to run the pump and the resulting net loss of energy from the system. I was told...

Hey everyone, as part of a university project working on renewable energy sources in the garden I am performing some simple fluid dynamics analysis to calculate the pump power needed to feature in this garden water feature. I have designed the schematics of the feature and worked out the...

I'm doing work in microfluidics, and need help selecting a vacuum pump as I have no experience in creating or controlling a vacuum. Let me simplify my device: I have water confined between two plates. One of the plates has a hole, covered with a small patch of material that let's gas through...

Is it possible to "pump" a swing 360 degrees? Homework Statement Is it possible to "pump" a swing so that it turns in a complete circle? Assume if you wish that the seat of the swing is connected to its support by rigid rod rather than a rope or chain. Homework Equations Angular momentum...

Hi, This is a question regarding my employment. A centrifugal pump at the source tank sends fluid 200m using 3" hoses to a recieval tank. When the automatic valve shuts on the recieval tank the pump stops due to it having a pressure sensor.When the pump stops there is 8 Bar pressure on...

Homework Statement If the temperature underground is 5 degrees Celsius and you'd like to keep the house at 20 degrees Celsius, how much work per joule leakage must be done to maintain the house at that temperature? Homework Equations Q/W = 1/(1-(Tc/Th)) The Attempt at a Solution I...

So, I've been thinking a lot on this lately. I want to use two turbochargers, one with just the compressor - and one with both compressor and turbine. Doing calculations at 10 deg C. Doing the math for Norway because commercially avatible evap heat exchangers doesn't really work well in our...

You are the Chief Engineer for a prominent hydraulics consulting company. Your client wants to pay you lots of money to design a system to deliver 1 m3/s from reservoir A at elevation 300 m to reservoir B at 500 m. The distance from A to B is 1000 km and the elevation between the two reservoirs...

Homework Statement I am trying to work out the Cop of a heat pump in an experiment, I recorded the temperatures before and after the Condenser, but am unsure of how to calculate the work input to the condenser Homework Equations cop= heat gained at the condenser/ work input to the...

Question is attached I have spent a great deal of time on this problem and I am hoping someone can help me out. My attempt at problem. first for the heat engine QL/Qw1 = TL/Twaste so efficiency = 1- Tl/Twaste efficiency = 0.93808 and I know that efficiency = Wout/ Qw1 This is as...

Homework Statement Find the work required to empty a 10m high conical tank with a radius at the top of 4m by pumping the water out the top of the tank. The water level is 2m below the top of the tank. Homework Equations \pi r^2 Similar triangles The Attempt at a Solution...

Homework Statement Water is pumped steadily out of a flooded basement at a speed of 5.5 m/s through a uniform hose of radius 1.0 cm. The hose passes out through a window to a street ditch 2.8 m above the waterline. What is the power of the pump? Homework Equations .. The Attempt at a...