What is Pump: Definition and 653 Discussions

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.Pumps operate by some mechanism (typically reciprocating or rotary), and consume energy to perform mechanical work moving the fluid. Pumps operate via many energy sources, including manual operation, electricity, engines, or wind power, and come in many sizes, from microscopic for use in medical applications, to large industrial pumps.
Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers and other components of heating, ventilation and air conditioning systems. In the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificial heart and penile prosthesis.
When a casing contains only one revolving impeller, it is called a single-stage pump. When a casing contains two or more revolving impellers, it is called a double- or multi-stage pump.
In biology, many different types of chemical and biomechanical pumps have evolved; biomimicry is sometimes used in developing new types of mechanical pumps.

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  1. H

    Electrohydrodynamic pump and equations

    Hi all. I am reading a paper about electrohydrodynamic pump and I encounter the following equation. Can anyone explain me the physicl meaning of these two equations? I find no clue in understanding them. The first equation is from the manipulation of Maxwell's equation in an...
  2. E

    I need a pump that will shoot LOTS of water extremely far

    what would be a good setup to shoot as much water as possible , as far as possible?
  3. I

    Vacuum Well Pump: Understanding Pressure & Density

    Homework Statement When you look at the manual hand pump, you would push down on a lever and a piston would rise creating a vacuum in the chamber. which would bring the water upward because of atmospheric pressure push the water upward. Now I have two questions about this. My first question...
  4. B

    Servo-controlled, two-way pneumatic pump?

    Hi. I'm a high schooler from Oregon, and I'm in a bit of a dilemma right now. What I'm trying to do is make a 5x5-pin tactile display for a high school physics project. I currently have a Makezine controller that can sink 1A @ 12VDC per analog output, and control 2 stepper motors or 8 servos...
  5. mbrmbrg

    Power of Water Pump (from continuity?)

    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 1.2 cm. The hose passes out through a window 2.9 m above the waterline. What is the power of the pump? Homework Equations R_v=Av R_m=\rho Av where P is...
  6. S

    What is the minimum power required to operate the heat pump?

    Homework Statement It is proposed to heat a house using a heat pump operating between the house (27 degees) and the outside (-13 degrees). The heat loss from the house is 7kW. What is the minimum power required to operate the heat pump?Homework Equations The Attempt at a Solution e=Th/(Th-Tc)...
  7. K

    An Air Conditioner: Refrigerator or Heat Pump?

    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 rest as vapor. It flows...
  8. A

    Is the Clem Conical Pump Engine Actually a Functional Machine?

    I have found a few sites that contains plans for a hydraulic engine that could run itself for a total of nine days. http://www.rexresearch.com/clemengn/clemengn.htm" http://www.keelynet.com/energy/clemindex.htm" Would it be practical to use this as an engine.
  9. C

    How Do Venturi Meters and Filter Pumps Work?

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  10. M

    Understanding Pressure in Water Pump Systems

    Hello people, I have a question regarding operation of a water pump. Say, I have a large hot water pump (for purpose of heating) and that pump "pushes" (don't know correct term) water into system. Thers is one big pipeline consist of two pipes (one for sending and one for receiving water). I...
  11. S

    How Does Heat Pump Performance Vary Between Northern and Southern Climates?

    1. North vs. South. A heat pump is designed for southern climates extracts heat from the outside air, and delivers air at 20C to the inside of the houses. What is the average coefficent of performance of the heat pump: (Consider this to be a Carnot device) a) In the south where the average...
  12. H

    What is the formula for calculating pump power and efficiency?

    Hi all! How do we define the power of a pump? I read a formula from a book which defines the power of the pump as follows: Power of the pump = Maximum back pressure * maximum flow rate / 2 Can anyone explain why the right hand side equals the left hand side? I don't understand why the...
  13. U

    Find Fluid Flow Pump to Hit Plate Radially - 50-75 Knots

    Hello, I cannot figure out which pump or size of pump would fit the need I have. Can you please review the need and recommend a type and pump model/specification that you think would work for this application? I need to have a fluid flow of these specs, I don't have any constraints or...
  14. Ivan Seeking

    Inexpensive heat pump and A/C enhancement

    While in California – the land of air conditioners and swimming pools – I noticed a relatively easy freebee for air conditioners and heat pumps. First. for comparison and perspective, consider that geothermal transfer systems are now used to replace the condenser/evaporator coil in...
  15. C

    Can I Calculate Thrust for Different Pump Sizes?

    Hello All, I am building an ROV and would like to use bilge pumps for the thrusters. I would like to calculate the thrust that a prospective pump is going to create so as to decide which pump to buy. I know that the pump can output 1250 gallons per hour and has a nozzle with a 2" diameter...
  16. ?

    Thermodynamis - oil pump efficiency?

    Hi guys, could someone help me on this? I'm stuck :( *A motor draws 35kW electricity, it operates at 90% efficiency. The motor is connected to an oil pump which has an inlet diameter of 8cm & an outlet diameter of 12cm. pressure rise in the oil pump is 400kPa. oil enters the pump at 0.1m^3/s...
  17. E

    Asking about the coupling systems for the pump - electrical motor

    I have a glue pump system need to operate it by an electrical motor , so don't know how to choose the coupling designation ... may be there are some designation tables or other websites helping for that thing . also if there are some EQUATIONS , about that to depend on . with my best wishes
  18. ?

    Thermodynamics oil pump efficiency question

    Hi guys, could someone help me on this? I'm stuck :( *A motor draws 35kW electricity, it operates at 90% efficiency. The motor is connected to an oil pump which has an inlet diameter of 8cm & an outlet diameter of 12cm. pressure rise in the oil pump is 400kPa. oil enters the pump at 0.1m^3/s...
  19. P

    Is a Vertical Increase in Pressure Possible in the Pump Stage of a Steam Engine?

    My textbook shows a PV diagram for a steam engine with the pump stage having no change in volume and with only a vertical increase in pressure. How can that be done. I can only imagine pumping a substance by pushing it inwards hence increasing its pressure but also reducing its volume. How can...
  20. Ivan Seeking

    News A flex-fuel pump in every gas station

    Senator Biden suggested this on Meet The Press today: Mandate that every station must have a flex-fuel pump. This sounds like a very tempting idea. Whether the best approach or not, I think we need to set national goals to convert the US to alternative fuels as the standard within ten years...
  21. DaveC426913

    Plumbing Home project: noise insulating a pump while keeping cooling

    Please move to appropriate forum if necessary. I need some help. Attached is a pic of my standard 1/4hp Hayward pool pump. I want to enclose it to make it quieter. (The sound is being transmitted by air rather than by physical contact.) As a "proof of concept" I stuffed it in a storage bin...
  22. M

    Find difference in pressure in this water intake pump

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  23. J

    Calculating Exit Velocity & Mass Flow Rate of a Water Pump

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  24. N

    Calculating Home Heat Pump Efficiency & kW-hrs of Heat Delivered

    In a home heat pump, heat is absorbed from the Earth by a fluid circulating in buried pipes and delivered to the home interior. Suppose that the heat pump is 40% as efficient as a Carnot refrigerator. If the ground surrounding the pipes is at 5`C and the interior temperature of the house is kept...
  25. H

    Output rating of the pump motor in watts

    -------------------------------------------------------------------------------- A pump is to lift 29.0 kg of water per minute through a height of 3.70 m. What output rating (watts) should the pump motor have? An airplane pilot fell 380 m after jumping without his parachute opening. He...
  26. T

    Pump Down Principle Overview | Cooling System Control

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  27. J

    Calculating Heat Expelled from a Heat Pump

    A heat pump has a coefficient of performance of 7.05. If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, find the heat expelled to the warm indoors. Answer in units of cal. I believe COP (heating mode) : 7.05 and COP = Qh/W Qc = 20 cal so I have to find Qh= ? cal...
  28. D

    C Theatres: Where Movie Magic Happens

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  29. K

    Is Pump Flow Rate in a Closed Loop Constant?

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  30. T

    Heat Pump: A Closer Look at its Working Process

    I'm having real trouble understanding the working process of a heat pump. A liquid with a certain temp flows in a system and gets vaporized, then it is compressed so that pressure and temp increase. Then it is cooled by a substance with lower temp so that it becomes a liquid again, and this...
  31. E

    Can a Tiphon Effect Elevate 1000 Tons of Water to 10 km?

    how would you make 1000 tons of water go all the way up 10 km and then down again with no friction? have you heard about a tiphon? your toilet has one, you would make use of that principle if you wanted to take gas from a car deposit with a plastic tube with an ideal fluid you could make...
  32. C

    Stuck on a 1500hp Pump Problem: Solve for Velocity & Efficiency

    I have been working on this problem for 2 days and can't seem to figure it out.. A 1500hp pump throws a jet of water 125 m into the air. (a) With what speed does the water leave the mouth of the fountain. (b) If the overall efficiency is 60%, how many liters of water per minute are thrown...
  33. S

    Calculate Pump Output in GPM

    The cylinder of a pump has a 6 inch diameter. The stroke is 8 inches in length with 200 strokes per minute. Find the output of the pump in gallons per minute.
  34. C

    Difference between a fan and a pump?

    Not sure if this is in the right topic, but does anyone know the difference between a fan and a pump? I'm working on something where I need to distinguish a fan from a pump. I need to do so without limiting the pump to any specific type. Basically I need to allow for a piston & cylinder type...
  35. K

    Constructing an Electromagnetically Actuated Micro Pump

    Does anyone have any ideas on how to construct an electromagnetically actuated micro pump? If so, please post.
  36. S

    Calculate Force on Smaller Cylinder in Hydraulic Pump w/ 500kg Mass

    these are following information given: 2 cylinders with diameters of 50mm and 150mm are connected. specific gravity of oil=0.8 then on top of the cylinder with the larger diameter is a 500kg mass. so the question is on what is the force required on the smaller diameter? another information...
  37. F

    News US wants to pump Iraqi oil to Haifa

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  38. H

    Calculating Cost of 1KWhr Heat from a Reversible Heat Pump

    A perfectly reversible heat pump heats a building at 20deg from the atmosphere at 5deg. If the heat pump is run by an electrical motor whose efficiency is 80%, what is the cost of 1KWhr of heat supplied? (1KWhr of electricity is 6p) I am confused by this qn as I thought the efficiency, e =...
  39. A

    What Is the Coefficient of Performance of a Carnot Heat Pump?

    This question is killing me because I just can't seem to get it. A heat pump is used to heat a house in winter; the inside radiators are at T_h and the outside heat exchanger is at T_c. If it is a perfect (e.g., Carnot cycle) heat pump, what is K_pump, its coefficient of performance? Give...
  40. E

    Pump And Formula for calculations - Need Help Please

    This is the diagram of the mechanical system that i want to calculate the pump and the full Hydraulic system for it ... calculating of pressure and the pump pressure and the electriacal motore for the that H. Pump for holding the coil
  41. P

    Is that a pneumatic pump driving that arm?

    Hi... I've seen a lot of tractors, they seem to have a shiny aluminum on their arms.. Are those pumps?? What are the advantages of using them? And how to configure them, do they power by motor? Please explain in details, thank you.
  42. Y

    How many cycles until pressure decreases k times?

    Air pump is pumping out a gas from a vessel (vessel's volume is V). After each cycle i it pumps out dV. Gas is ideal. T=Const. After how much cycles pressure P will decrease k times? Here is my work. PV = nRT Initially n=n(0) After each cycle n decreases (1-dV/V) times. So, after x...
  43. E

    Modifying Hurricanes and Preventing Tornados: The Giant Pump of the Earth

    I figured out how to modify (weaken) a Hurricane and prevent tornados with a pipeline while using the rotational velocity of the Earth. Actually, the Earth is a Giant Pump.Gravity is greater at the poles of the Earth because the Earth is not spinning with as much velocity. This why you would...
  44. S

    Solving a Water Pump Problem: How Far Can 6.6 HP Pump Water at 220 gal/min?

    can someone give me some clues or help as to how I'm supposed to go about solving the following problem? my professor has not covered any of the material from this chapter, so i have no idea how to even start this. the question is: the motor on a water pump is rated at 6.6 hp. from how far...
  45. E

    Calculating Net Power for a Heat Pump Cycle

    Here's my problem: A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW. a) Determine the net power required to operate the heat pump, in kW. b) Evaluating electricity at 8 cents per kWh, determine the cost of electricity...
  46. E

    Water Pump System: Choosing the Right Electrical Motor

    Dear ... Please Try To Read Those : I have This System Of Water Pump Consist Of An Electrical Motor And A Water Pump For Lifting Water From An Underground To The Upground ... In A Factory Using This Pumped Water For Cooling The Iron That Produced Form The Rolling Machines ... (( Open...
  47. M

    DIY: Adding a Valve to PVC Tube for Bicycle Pump

    I'd like to put a valve (like the ones on tire tubes) that will connect to a bicycle pump onto a PVC tube (on the side, or at the end). Anyone know how I can do this? What fittings will I need? Thanks.
  48. E

    Choose the Right Water Pump for Your Water Pip Line

    Need to know the formula that i can use it to choose Water Pump ... or suitable ((( Water Pump ))) For any water pip line if i have known water tank capacity if i have two water reservoirs and need both to not to reach empty conditions
  49. J

    Slightly off topic pump question

    Ok this is VERY WEIRD so bare with me. I play gaida which is an instruments close to the bagpipes in Bulgaria. I would like to BUY or MAKE a footpump for this because I struggle as I don't have the lung-power to play I have tried the type of foot pump used on a rubber raft but this is...
  50. E

    Sodium Potassium Pump: Why Cells Maintain Ion Balance

    Why do cells tend to mantain low internal concentrations of Na ions and high internal concentration of k ions despite the surrounding fluid being low in k ions but high in na ions?
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