Pump Definition and 655 Threads

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 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. Both surfaces perfect black bodies with a perfect vacuum inbetween.The flat surface been at 273 degrees kelvin and...

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...

Homework Statement Find the minimum wind speed for the windmill to pump water. The pump is connected to a gear at a point 0.16m from the center. The radius of this gear (Gear 1) is 0.2m and the gear which it interlocks with is 0.1m (Gear 2). They intersect each other perpendicular to one...

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 numerical solution of poisson equation with application to the pumping of water from drains 1. time 2. Amount of water has been pumped Homework Equations The poisson equation The Attempt at a Solution 1. I know i have to use iteration 2. I am still...

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...

For those who don't know, I'm an HVAC engineer. From time to time, the issue of heat pump efficiency comes up. When picking a system, obviously efficiency (cost) is important, so we need to decide between, usually, heat pumps (air source) and gas for a small split system. The government has a...

Homework Statement Air conditioners operate on the same principle as refrigerators. Consider an air conditioner that has 7.00 kg of refrigerant flowing through its circuit each cycle. The refrigerant enters the evaporator coils in phase equilibrium, with 54.0 % of its mass as liquid and the...

What does it take to manufacture such a syringe pump? What kind of motor is usually used in these systems? http://www.macros.com.tw/p_kds.asp

Thermo --> Heat Pump, confirmation. Homework Statement A cooling unit for a fridge has a 100 W power input. Environment temperature is 298 K. The heat which enters the fridge due to defective isolation is 350 W. What is the minimal temperature the fridge can reach? Homework Equations...

pump add air into the flat tire in the gas station. The compressed air is at 180 psia and 60F(+460). the tire is initially at vaccum, therefore p0=0 psia. Air is added into the tire until it reaches Pf =32.9 psig which is (23.9+14.7=47.6 psia), then stopped . this process is adiobatic which...

Tank Problem -- Pump at the END? I will try to post more relevant data if possible but my main issue is this: I have a pump that receives water from a reservoir--so basically a gravity feed into an open-air tank. The tank itself is supposed to feed into a pump (that is located at the very...

A bicycle pump contains air at STP. As the tire is pumped up, the volume of air decreases by 30% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change? Select the correct answer. a. 1.4 b. 0.7 c. 2.6 d. 0.9 e. 2 What...

I am having problems with a pump installed. I am trying to determine if it is to large for the application because there is a lot of cavitation during the process. I have the pump information 60GPM with a 5Hp Motor. RPM is 1725. How can i calculate lbs/hr of the fluid flowing?

hi guys. I need some basic information about a pump that will be able to transport a nickel slurry up around 1-2m high. the mass flow rate of the slurry is 27 kg/s with a density of 1218 kg/m^3. the temperature of the slurry is 25 deg c. What is the best type of pump to use in this...

When I select a water pump for a pipe, I select the pump that matches the pipes nominell diameter. A DN100 pump for a DN100 pipe for instance. It only seems natural to me. But I see that others usually go down on the pump size, a DN65 or DN80 pump for a DN100 pipe for instance. Why is this...

Homework Statement on a venturi pump the fluid, air or water move through a narrow tube and increases speed and also decreases pressure. Now I have read before that the dynamic pressure and the static pressure are added to get the total pressure. How fast does the fluid have to flow to create...

could anyone please tell me how a manual/hand water pump works? thanks

Fluid - Determining pump power for pipeline with constant head gentlemen, i need some help to solve for part b as attached. The friction factor for pipe 1 & 2are 0.003106 and 0.003438 respectively and the Z value calculated is 9.997m of water. With a 20% increase in flow rate for the piping...

Hi, I'm currently an art student at the University of Houston, and I've run into a bit of a roadblock. I'm working on an installation in which an audio signal from a headphone jack will be sent to an A/V Receiver Unit. From the A/V unit, the wiring for the left speaker will be hooked up to...

1. A heat pump is being used to keep the temperature inside a house at 23 C, while the tmeperature ouside is -6.0 C. The heat pump is providing heat inot the house at the rate of 8.8 kW with a coefficient of performance of 5.6. A) What power input (in KW) is needed to run the heat pump? B)...

Homework Statement A hemi-spherical tank with a 5 foot radius is full of water. Given than water weighs 62.5 pounds per cubic foot, find the work required to pump the water out of the tank Homework Equations Radius = 5 so range will be 0 to 5. Formula should be pi * r^2 for each...

Hi, Is it more efficient to run a heat pump in a house 24/7 or turn it off at night time and during work. All the pros seem to say its more efficient running them 24/7 I can't understand that as there is more heat loss with the greater heat differential running it 24/7 Thanks Darren

About those hydraulic devices that are used for lifting cars and such; how can you calculate the maximum speed at which those will operate?

This kind of belongs to halfbakery.com, but it is down now. (I found on archive.org that) hydraulic pump (like the kind used to lift cars) forces and the surface areas of the two ends works by the equation F1 = F2(A1/A2). Say you had a .025 m^2 (end 1) surface on one end of a hydraulic pump...

hay everyone i have a research on centrifugal pump and specifically on the pump volute. this research is for fundamentals of manufacturing course, i need some help with finding the appropriate sources of information. so does anyone know a good book or a website that is not in...