Best efficiency point and operating point for pumps, Civil Engineering

Assignment Help:

Q. Best efficiency point and operating point for pumps?

In a pumping system, a system curve can be derived based on static head needed to lift up the fluid and variable head because of possible head losses. Pump curves that relate the performance of pumping to head against discharge can be attained from pump suppliers. When system curve is superimposed on the pump curve, intersection point is defined as operating point (or duty point). Operating point may not be essentially the same as best efficiency point. Best efficiency point is a function of the pump itself and it's the point of lowest internal friction inside pump at the time of pumping. These losses are persuaded by adverse pressure, shock losses and friction. 

Losses owing to adverse pressure gradient take place in pumps as the pressure of flow increases from inlet to outlet of pumps and flow travels from a region of low to high pressure. It causes the formation of shear layers and flow separation. Flow oscillation can also take place that accounts for noise and vibration of pumps. Effect of adverse pressure gradient is more substantial in low flow condition. 

For shock losses, they are persuaded when inflow into pumps isn't radial and comprises swirl. In an ideal situation, flow within the pump must be parallel to impellers such that flow angle is very close to impeller angle. Deviation of the above situation from design causes energy losses and vibration.

1627_Best efficiency point and operating point for pumps.png

Fig: A diagram showing point of best efficiency ≠ operating point


Related Discussions:- Best efficiency point and operating point for pumps

Engineering mechanics, Characteristics of couple #Minimum 150 words accepte...

Characteristics of couple #Minimum 150 words accepted#

State the term - constant eccentricity, State the term - constant eccentric...

State the term - constant eccentricity A pre-stressed concrete beam has a width of 300 mm and an overall depth of 450 mm. The permissible stresses in tension and compression du

Explain the ion exchange water softening, Explain the Ion Exchange water So...

Explain the Ion Exchange water Softening Softening is usually done using a resin (natural or synthetic long chain chemical with a sodium ion attached). When water containing ha

Regression, I would like to ask what is regression and its function?

I would like to ask what is regression and its function?

Rcc structure, neea BM & SF CALCULATIONS & DWNGS

neea BM & SF CALCULATIONS & DWNGS

Explain the cross sectional area of flow, Cross-sectional area of flow (ft ...

Cross-sectional area of flow (ft 2 ) (A) For rectangular channels = (w)(d). For trapezoidal channels, divide the flow area into two side triangles and one center rectangle, so

#title., desirable properties in green concrete

desirable properties in green concrete

Matrix method of analysis, Ask question #Explalin a joint frame by stiffne...

Ask question #Explalin a joint frame by stiffness method

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd