Where Does the Energy Go in an Electric High Pressure Water Motor or Pump?

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Discussion Overview

The discussion revolves around the energy loss mechanisms in electrical high pressure water motors or pumps, specifically in the context of pressure washers. Participants explore various factors contributing to energy loss, including heat, friction, and efficiency considerations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests that energy loss may primarily occur due to heat/electrical losses in the motor, followed by friction of water in pipes and noise.
  • Another participant questions the possibility of a universal answer, noting that factors such as motor sizing, efficiency, flow rates, and pipe lengths can all influence energy loss.
  • There is agreement that the discussion pertains specifically to pressure washers.
  • A participant inquires about any comparisons made between electrical input and pressure washer output to quantify energy loss.
  • One participant describes common pressure washers as using positive displacement pumps, indicating that the largest energy loss typically arises from creating differential pressure, with additional losses likely occurring in the drive motor.
  • Fluid losses are suggested to be minimal due to relatively low flow rates.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of the question and the various factors that can affect energy loss, but no consensus is reached on a definitive cause or ranking of losses.

Contextual Notes

Limitations include the dependence on specific configurations of motors and pumps, as well as the need for quantitative measurements to assess energy loss accurately.

Patrick Jago
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In an electrical high pressure water motor or pump what is the main cause of energy loss.
Originally I was thinking along the lines of
1st heat/electrical losses in motor.
2nd Friction of the water in pipes.
3rd noise. But I'm torn between the first 2 ? Tho
 
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How could there be a universal answer?

  1. The Motor can be over /under sized, or high /low efficiency.
  2. High or low flow rates.
  3. Long or short pipe runs.
  4. Losses measured at the pump outlet or at the pipe ends.
 
Agreed

Although this question in particular is concerning a pressure washer.
 
Patrick Jago said:
Agreed

Although this question in particular is concerning a pressure washer.
Have you done any comparison yet of electrical input and PV output? to obtain for a quantitative value for the loss.
 
Most common pressure washers are simple positive displacement pumps with pistons, check valves used to control flow into and out of the cylinders. If that's what you're talking about then the biggest loss is usually creating the differential pressure. After that I would suspect it's losses in the drive motor. Fluid losses are probably minimal since flow rates are relatively low.
 

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