Pump Definition and 621 Threads

let's say some amount of heat is absorbed by a refrigerant for phase change at a low pressure. will this heat absorbed be equal to the heat given out by the compressed refrigerant at high pressure? i know that the amount of heat required for phase change from liquid to vapour is less at low...

let's say some amount of heat is absorbed by a refrigerant for phase change at a low pressure. will this heat absorbed be equal to the heat given out by the compressed refrigerant at high pressure? i know that the amount of heat required for phase change from liquid to vapour is less at low...

Hey guys, I've been strugling with a concept recently and was hoping someone familiar with fluid dynamics could answer. I am trying to calculate the flowrate of a flow circuit with a given pump. I have the pump performance curve (flow vs. head) of the pump and I know all the given pipe...

Homework Statement Suppose a large gasoline tank has the shape of a half cylinder 8 feet in diameter and 10 feet long. If the tank is full find the work (W) necessary to pump all the gasoline to the top of ht tank. Assume gasoline wights 42 pounds per cubic foot. Homework Equations W=...

Hello, I am to design a pump for the cooling circuit of a 4-stroke, 4-cylinder gasoline engine. The engine has already been designed. I am currently referring to Pump Handbook (McGraw Hill publications) and trying to get a hold of Centrifugal Pumps-Design & Application (Ross-Lobanoff). One...

Homework Statement A pump, taking water from a large reservoir, is used to spray a jet of water with speed 20 ms^1 and radius 0.05 metres, from a nozzle level with the surface of the reservoir. Calculate the power of the pump. Homework Equations The Attempt at a Solution Alright...

Air weighs about 800 times less than water, 1 litre of water weighs 1000 gms approx. while 1 litre of air weighs 1.25 gms approx. So theoretically it should need less energy ( in fact a lot less) to create a rough vacuum in a given volume than it would need to remove a liquid (water) from the...

Hi, I am working in a pump manufacturer company. When i went on first day to office, i saw inside the pump that its having one small magent attached to stroke rod. Can anyone explain me, hoe magent is useful in that and a small PCB design was also located in the pump. I am eager to know...

Hi Friends, a high quality submersible water pump from Italy, it is 220 volt, 1,100SA, 4.3 amps, and it is grounded into the Earth while in use; and we also have an emergency electrical cut-off that cuts the power in case of an electrical short; but the question is, in a new high quality pump...

Hi Friends, a high quality submersible water pump from Italy, it is 220 volt, 1,100SA, 4.3 amps, and it is grounded into the Earth while in use; and we also have an emergency electrical cut-off that cuts the power in case of an electrical short; but the question is, in a new high quality pump...

Okay, I should just go buy one and look at it, but just wanted to do some background research on it. I want to use it to dose dechlorinator into an aquarium and wanted to think if this will work. Yes, they sell VERY expensive ones for this purpose, but why spend more when you don't have to...

Homework Statement A pump motor is used to pump water at a certain rate from a given pipe. to increase the rate of pumping of water 2 times from same pipe by how much times power of motor must be increased? Homework Equations The Attempt at a Solution

hello I have to deal with a vacuum pump in my graduation project & i don't how ?? shall one help me with all my respect & greetings , i want to know the inlet , the outlet & the electrical connection of this vacuum pump the rest of the pic in is the next reply

a pump capacity of 10 m^3/hr at 30 meters head. what does the 30 meters head mean? thank you..

Homework Statement A pump lifts a liquid of density \rho to a height h and accelerates it from rest to a final velocity v. What power P does the pump deliver to the liquid, if the liquid is being pumped through a pipe with a cross sectional area A? 1. Av\rho + \rhogh 2. Not enough...

I have recently gotten heavily into home beer brewing with some people. To improve on the cooling of the wort (boiled beer before fermentation), I want to pump the boiling liquid through a long copper coil. This coil will be inside a cooler filled with ice and the cooled wort will come out on...

I am designing a digital circuit for water pump control to always top-up the over-head tank by pumping water from the sump. I am using sensors in the over-head tank. I am now wondering why shouldn't I start the motor as soon as the water level in the over-head tank drops just a little below...

submersible 480v pump w/out ground! I came across a 480vac submersible pump (70hp) that was not grounded. This lead me to a question about water and electricity. If the motor lead (one of them) insulation had been damaged and the conductor came in contact with the water, what would be the...

Hi All, I was given the challenge of building a high flow rate pump, but I haven't been able to find any resources were useful. I'd like to control the pump and its pulsatile nature with a LabVIEW VI. I know I'd have to get a stepper motor and a DAQ board, but I'm not sure where to begin. I'd...

A coworker has a well pump that is a 0.5 horsepower, brand new, no issues... He says the normal amp draw is 4 to 5 amps. This is puzzling because it is a 240V pump and the math works out to (746/240 = 3.1/2 = ) 1.55 amps. What is going on?

What is the correct way to put limitation on different aircraft flying conditions with respect to the cavitation point of view of the Fuel booster pump in the aircraft? The pump is immersed in the fuel and the fuel tank is vented to atmosphere(in atmospheric pressure, which will change with...

Homework Statement Hey. I've posted a few questions around here lately, and really appreciate any help! thanks Right, attached is an image showing a simple pump system. pump inlet gauge pressure = Pi = -34.2 kPa nozzle diameter = 5cm rho = 1000kg/m3 Calculate the flow rate 2. The...

If a question asks for the "quantity of work input to the pump" is it acceptable to present the answer as positive. I think so because the direction of energy transfer has been defined in the question itself hence there is no need for a sign on the answer. All that's asked for is the...

I have a general question, it's not homework or anything, we are studying heat pumps and thermal efficiencies and COP. There's an example in my book that has a heat pump that is heating a house and it asks to find the minimum theoretical cost per day. Of course the solution and detailed steps...

Hi,, I want to ask you about how much pressure inside the water pumb for the engine??, because I want to investigate the load failure?

Hi, I'm new into this forum. I'm planning to do a syringe pump controller to be used with a Labview software. As far as i know, precision flow rate movements higly depends on having the right stepper motor being used. Has anyone done anything similar on this? I'm looking for the right...

hey i have a 5W pv panel and was wondering if i could build some sort of circuit to run my pool pump? was wondering what i would need ... any thoughts would be appreciated

Hello, Was wondering if anybody could help with the following question as I am struggling, and this area is not my strong point. Note this is not homework purely self-study, out of curiosity to help me understand the subject area in more detail. In each minute a pump draws 2.4m^3 of water...

OK, here's my dilemma: I have a pump that requires 3600RPM, 24lb.ft. of torque (optimally) to run it. It was attached to a gasoline powered 16HP motor, and I need it to run off of an electric motor now. Not so difficult, you say? My only power supply is limited to 24VDC. I am looking for...

Homework Statement The floor of a basement in a house is 3.2m blow the grade of a window sill. If the Basement has flooded to a depth of 0.44m and the basement is 10.3m by 18.4m. If the water leaves the pipe at 2.4m/s, how much work was done by the pump. (Density of water is 1000 kg/m^3)...

1. You have a heat pump which has a coefficient of performance (C.O.P.) that is 17% of the maximum achievable. You want to heat your house to 20◦C. At what outside temperature does the heat pump become not useful? 2. C.O.P. = 1/(T1/T0 - 1) T1= Temperature of the outside...

We have a carnot engine with Th = 800 degrees Celsius, and Tc = 50 degrees Celsius. This produces a work which is drives a carnot heat pump which has heat reservoirs at Th' = 50 degrees celsius and Tc' = 0 degress Celsius. What is the ratio of heat absorbed by the Heat Engine to the heat...

i understand that there are times when one should (on paper) pump a network of resistors, capacitors, and inductors with a 1 amp ac current source or a 1 volt ac voltage source in order to determine certain values within the system however, i am having trouble determining when i need to use...

Homework Statement I want to calculate the areas of a hydraulic oil pump which will be used to lift a load(car). My load ratio is 50:1 and i want to transfer this power using a lever. I want the second piston to travel to max position on approximately 40 strokes. Also i want the ratio of the...

I understand that the purpose of a vacuum pump is to remove the gas molecules from a sealed volume to create a partial vacuum, but just what is actually happening to the gas molecules throughout this process? I have been researching online, but have not found any guides that clearly explain the...

Hey folks, I'm trying to do a bit of back-of-the-envelope stuff for a hypothetical slurry pipeline, but it's been a while since I've done any fluid mech./dyn., and I have no confidence in my numbers -- please jump in wherever you catch an error. First of all, I'm making the assumption that...

what kind of a pump is used in creating vacuum in vacuum flasks or thermose. Diffusion pump, Roots Blower, Rotary vane pump

Hi I have a pump which for 0 head will provide a max flow of 12 l/min (0.0002 m^3/s). For the piping I am using (3/8"), by my calculations this gives a theoretical MAX mass flow rate of 0.2 m/s and a MAX velocity of 2.8 m/s. As i understand it, these values are not taking into account (1)...

Homework Statement A heat pump heats a house in winter by extracting heat from the cold outdoors and releasing it into the warm interior. for the transfer of a given amount of heat, (a) how do the entropies of the interior and exterior of the house change (increase or decrease) b)which...

With an average wind speed of 2.67 m/s I am designing a wind turbine which will pump a 1m head of water. I have calculated from the size of my turbine I will be able to pump a volumetric flow of 0.219m^3/s. This is where I am stuck.. I cannot calculate the size of pump which I will need. Can...

Is it possible to create analog of a heat pump which would be able to concentrate potential energy of electrons in one place, using some work, so there would be gain in energy?

Homework Statement When you push down on the handle of a bicycle pump, a piston in the pump cylinder compresses the air inside the cylinder. When the pressure in the cylinder is greater than the pressure inside the inner tube to which the pump is attached, air begins to flow from the pump to...

Hi, I'm having a little bit of trouble. I need to work out the amount of energy the wind provides at an average speed of 2.67m/s when the blades of a turbine are 0.5m in length? Also how would I use this energy in order to calculate the size of a reciporacting pump needed to pump a head of water...

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps. But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a spring is used to make the control shaft of a pump return to its neutral position. Totally the torque to actuate a pump is...

Homework Statement A house is heated by means of a carnot engine operating in reverse (Heat Pump). The outside Temperature (Tc) is 270k, and the required inside temperature (Th) is 300k. If heating the house to this temperature normally requires 10kW of electrical heating, how much power is...

i need some help becoase i become confused according to pump characteristic curve if the flow rate increased the head will decreased the question is how i can increase the flow rate and what is the relation of RPM with head and flow rate

I'm currently doing a testing on hand pump from 2 different brand. Let's say Brand A and brand B. Brand A hand pump is 20cc/cycle with maximum pressure 350 bar, Brand B hand pump is 25cc/cycle with maximum pressure 350bar as well. 1. brand A hand pump easily pump up to 92bar, but after i tried...

If pump's motor load is around 33 ampere and 48 volts, how do you calculate the maximum flow and the head? Note the it is a vertical centrifugal pump

Hi everyone, I am in the process of putting together a water feature and am having trouble selecting the correct pump for the job. The pump will be required to pump water to a vertical distance of approx 7.4 meters. A submersible pump would be best. The pipe coming up from the pump is 12mm in...

Does anyone know what type of pump is used in nuclear plant's pump house?