Pump Definition and 621 Threads

hi, I've been inspired by this wind generator design: http://www.instructables.com/id/Pringles-Wind-Turbine-Pleech---Version-One/ to make it operate in reverse, that is, feed alternating current and make the thing spin. The purpose of this is to make a pump by putting a wheel (similar to those...

I am building a small device that operates underwater so I am powering it from this...

Homework Statement A heat pump with COP of 2.5 is used to heat a house. When operating, the heat pump cosumes 8kW of electrical power. If the house is losing heat to the outside at an average rate of 40000 kj/h and the temperature of the house is 3 degree celcius when the heat pump is turned...

I want to build a pump system using the water pressure from a 36 inch deep pond (up to 96" weather permitting) to pump water to a holding tank 100 feet above the 36" water level. after reading thru 15 pages of posts "water pumps" etc. on PF my head is spinning. At the dam there is access to...

Hi, I'm doing a science project involving the energy required to run a heat pump for the average size automobile measured in watts. I've been going through sites like mad, but can't find anything helpful. can anyone give me an estimate, or better, a reference to a site with such data on it? I'm...

Hi Guys I am trying to use a water filter in line with a 12V water pump rather than off the mains. The water filter requires 10psi minimum and a maximum of 125psi, I am using 15mm copper pipe and the pump is 800mm from the water filter. I have not yet decided on a pump yet as this is...

I have 5 Solar Concentrator panels I have built with a 1 meter wide by 3 meter long footprint each. The solar absorber tubes are 3/4" Type M Copper piping that is black chrome coated (98% absorptivity) surrounded by a borosilicate glass envelope (92% transmissivity). There is a hard vacuum...

Hiya my question is Why is it impossible with a pump to suck water from a lake if you place the pump 15 meters above the water I think it has somthing to do with gravity but if anyone could explain it in detail that would be great Thanks :)

Homework Statement A pump is electrogenic, meaning that 3 Na ions are pumped in for 2 K ions that pumps out. Given that the active current --> I' (Na) 30 E-9 , find the passive current of Na --> I (Na). Assume cell is in steady state so Vm, [Na] inside and [K] inside is constant...

i need to find 3D pump geomtery in solidworks, catia, or proengineer

hi, i've read somewhere that modern vane pumps' vanes have an area of contact on the housing and the older versions had line contact. does anyone know how this is achieved? why is this better? how is this connected with friction? what types of seals are used, rubber or synthetic? any thought...

Homework Statement The question asks us to advise the company on a heat pump (and give reasons) which is claimed to deliver 1500J to a room at 280K by consuming 50J of work per cycle pumping heat from the surroundings at 270K. I've drawn a diagram of the heat pump, taking heat Q2 from a bath...

Dear Engineering Experts, I saw this pressure washer on youtube : and could not figure out exactly what type of pump is used. I could not find the manufacturer's home page. Websites featuring this are : http://home-solutions.hsn.com/nomad-h2o-on-the-go-power-washer_p-3652885_xp.aspx...

Dear all, I have worked with a challenge for two full days now without managing to solve it. I would be MOST grateful if anyone could help me sort out my confusion concerning the problem. I have a suction hose (100m, Ø 5cm) that is connected to a larger mouthpiece in the end (Ø 30cm). The...

Just a quick question, which mayb be very simple to answer, I have a system which is currently running R134a as the working fluid, are there specfic circulators i have to use to move the fluid around? I have the pressure drop and head for the system calcuated, but am stumped on what pump i...

Homework Statement A 2 Horsepower engine runs a water pump for 24 hours a. What is the work done by the engine? b. What would happen if a 1.0 horsepower was used to pump the same amount of water? W= F * D But i don't know what D is? so how must i solve this? please help! :[

I have completed the first part of the problem below. I am checking to make sure that I have the right thought process... Also the next part of the question asks if the inlet pressure to the pump is -2.36 psi compute the power delivered by the pump to the water...How would I approach that...

1.What happen when we connect 3~ phase star connection 415volts pump to single phase 250 volts power supply?,it gets burn?. and 2.How to check motor winding of any motor with multimeter? Thank you.

Homework Statement Some electric-power companies use water to store energy. Water is pumped by reversible turbine pumps from a low to high reservoir. To store the energy produced in 1.0 hour by a 120*106 electric-power plant, how many cubic meters of water will have to be pumped from the lower...

Homework Statement A spherical tank is full of water. If radius r = 3m and height h = 1.5m, find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 \pi)Homework Equations Work is the integral from a to b of f(x)dx. The Attempt at a Solution Volume= area *...

the ends of an 8 foot long water trough are equilateral triangles having sides of length 2 feet. If the trough is full of water, find the work required to pump all the water over the top.

A constant volume of 1800 cf of water needs to be introduced into the base of a 60 ft tall (15x15) water tank. I need to determine the hp/kw needed in order to do this. Can anyone explain the math on determining this? Thx Jeff

I was told that a pump in a heating system that from time to time pushes against closed valves is not good for the pump. If so, how will it affect the pump in the long run?

Hi Folks, It seems there are some differing opinions in my office with respect to the following. If one is to pump water through a long lenth of 1.75" pipe (16000'), how would you go about predicting the temp rise of the water as it flows along the pipe? From what we have found, when...

O.K. this is maybe a large question... I am trying to find out how much energy it would take to do the work of a heat pump compressor that would be required to heat a... let's say 10 ft. x 10 ft. room of a typical house. I know there are a lot of variable here... What I am trying to...

I've always been told that systems that involve a heat pump need to be designed for a delta T of about 10C, not the more usual 20C, apparently because the pump can't lift the temperature more than this. Is this correct, and why is this so?

is it possible to get a cold surface radiating more heat to a hot surface than the hot surface to the cold? 1. Homework Statement Find the net radiation between two surfaces per square metre,1mm apart one surface flat and the other sigsawed with valleys 100 mm across tops and 100mm deep...

Homework Statement An ideal (Carnot) engine has an efficiency of 50 % If it were possible to run it backward as a heat pump, what would be its coefficient of performance? Homework Equations COP = (TL) / (TH - TL ) The Attempt at a Solution no temperatures are given. I just...

Homework Statement You are required to pump water out of a very deep mine. Where should you put the pump? Homework Equations P=P(surface)+rho(g)(h) The Attempt at a Solution I am sure that this is a very easy problem but I can't see mathematically how to solve it. I know that if...

***Building a pump from scratch, engineering competition*** Hello everyone. I have been entered into a competition. The spec is to build a pump that can pump 30 litres of water a minuet for 30 minuet to a height of 4 meters. The pump has to be built over 3 days (18hours) but i have...

I have been working on an idea for a new energy source that I would like to get some input on. I took physics in college about 10 years ago, so I have a general understanding of the concepts, but I am definitely not an expert on thermodynamics. Here is my idea: 1. Use a heat pump(ground...

Hi all, I'm stuggling with a design problem to do with pump selection for a reticulation system at a mine site. Essentially I have to reticulate water from a storage dam to the following areas with the following minimum discharge pressures. - Conveyor washboxes and spraybars ( constant...

I know the formulas for efficiencies e of heat pump (it is e<=Tmax/(Tmax-Tmin)) and refrigerator (e<=Tmin/(Tmax-Tmin)), where Tmax and Tmin are temperatures of warmer and colder (respectively) involved containers. These formulas make me puzzled, as efficiencies seem to be possibly bigger than 1...

Homework Statement Assume that you heat your home with a heat pump whose heat exchanger is at Tc = 2degrees celcius and which maintains the baseboard radiators at Th = 47 degrees celcuiys. If it would cost $1000 to heat the house for one winter with ideal electric heaters (which have a...

Kindly check the attachment for the picture of the spray pump. Please link me to the thread/post if this is already discussed elsewhere on the forum. Is the working of this pump has anything to do with vapor pressure? Thanks in advance for any help.

hi guys I am working on a project which requires the transportation of microalgae. I was suggested to use slurry pump for the same. however I wanted to know its mechanism of functioning before jumping on to its purchase. I was not ble to find a satifactory reaponse to my query. I would be...

Homework Statement A bicycle pump is a cylinder 20cm long and 3.0cm in diameter. The pump contains air at 21.0C and 1.0atm. If the outlet at the base of the pump is blocked and the handle is pushed in very quickly, compressing the air to half its original volume, how hot does the air in...

My main question in order to solve this problem is...should kinetic energy be neglected? Ok, so here's the problem question: Sea water with a density of rho = 1025 (kg/m^3) flows through a pump of 0.21 (m^3/s). The pump inlet is 0.25 (m) in diameter. At the inlet the pressure is -0.15 (m of...

Hello, I need some help selecting a vacuum pump. Required specs - 5 CFM - vacuum (0-10 in/mg) - possibility of sucking up small metal particles (size:50-200 microns) - working fluid is argon/air - needs to handle high heat My original feeling was to go with a venturi design made...

if everything emits radiation, if you can stop the radiation from a hot body to a cold one but let the radiation from the cold to the hot you would have a type of heat pump.if you had a sphere (the hot body )with a vacuum in it and a relativey small cold body in the middle perhaps the...

The schematic shows a central heating system. I'm wondering if I can drop the twin pump? If each of the single pumps are powerfull enough to bring the water around through the heat exchanger then why do I need the twin pump?

I need help, I have no background in engineering or fluid mechanics. I desire to find out the availability of a rotary/axial pump which has a size of 2cm X1 cm X1cm which can pump luids from 1 cc/min to 50 cc/min. The pump should be connected to the drive unit by a cable, so that the drive unit...

Hi, Can anyone help me understand the purpose and function of accumulators in a pump system? Also if anyone has any information on the sizing and design of accumulators, it would be helpful.

Submersed water pump for river flows. Two cylinders, one with 1 meter diameter and the other 0.2 m/diameter. Pistons are in the same shaft. Area ratio is of 25 X. The bigger cylinder have a shroud of a diameter of 1.5 meter in both ends and is open on both sides. When we submerse it in the...

I have a project that i am doing that requires that i pump methanol at a temperature of about 140F at a volume of about 1 to 2 gpm and a pressure of around 150 - 200 psi. It must be capable of 'run dry' by which i mean that it may not always have fluid to pump. Can anyone give me a lead on a...

A fountain designed to spray a column of water 11.5 m into the air has a 1.34-cm-diameter nozzle at ground level. The water pump is 2.75 m below the ground. The pipe to the nozzle has a diameter of 2.68 cm. Find the pump pressure necessary if the fountain is to operate as designed. (Assume...

Homework Statement Water is pumped steadily out of a flooded basement at a speed of 5.0 m/s through a uniform hose of radius 1.0 cm. The hose passes out through a window 3.0m above the waterline. What is the power of the pump? Homework Equations The Attempt at a Solution I...

Homework Statement Water is pumped steadily out of a flooded basement at a speed of 5.7m/s, through a uniform hose of radius 1.01cm. The hose passes through a window 2.96m above the waterline. What is the power (in W) delivered by the pump? Homework Equations Continuity and Bernoulli...

Homework Statement HI guys, this is an exam review question from the Fundamentals Engr exam. Not sure how to do it, please help me along so I can learn it too! Water enters a pump steadily at T1=20°C, p1=100 kPa at a rate of 35 L/s and leaves at p2=800 kPa. The flow velocities at the...

Hello, For the course "System Theory" I'm following, I have to identify systems in every day life and explain some of its properties (input, output, internal variables, internal parameters,...). I thought a fountain was a good idea for such a system. The problem is I don't know what water...