# pump efficiency law

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• ### DOE Pump Efficiency Rulemaking

Rotodynamic Pump Efficiency Prediction Guideline: The HI Pump Efficiency Prediction Committee has begun to gather new pump performance data to update this important guideline that relates pump efficiency to pump type, specific speed, and pump size. Considerations such as surface roughness, internal clearances, mechanical losses, pumpage, impeller design and diameter trim, and thrust …

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• ### Pump Efficiency - uaex.edu

2014-4-16 · Pump Efficiency Pump efficiency is defined as the ratio of water horsepower output from the pump to the shaft horsepower input for the pump. Water horsepower is determined by the flow rate and pressure delivered from the pump. The shaft horsepower is delivered to the pump from the power unit, which usually is an electric motor or internal combustion

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• ### Pump Efficiency—What Is Efficiency?

2012-1-20 · The overall efficiency of a centrifugal pump is simply the ratio of the water (output) power to the shaft (input) power and is illustrated by the equation below: E f = P W P S Where:

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• ### Eight Things to Know About Pump Efficiency

2018-11-20 · The formal rule was introduced in January 2016, with a four-year window for pump manufacturers to comply with the efficiency standards. Manufacturers have a choice between redesigning existing products or discontinuing them. If pump models have not been recently redesigned, the DOE requires re-certification by the manufacturer to ensure compliance.

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• ### (PDF) Evaluating the Approximation of the Affinity

Typical Pump Efficiencies Pump only (brake, no motor) Non-clog centrifugal, 25 hp: 65% Submersible wastewater, 34 hp: 75% Vertical turbine, water, 30 hp: 81% End Suction, water, 30 hp: 75% Bigger is better: add about 5 points at 200 hp Slower is better: add a couple points below 1200 rpm

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• ### Energy Efficiency Considerations in Pumps and Pump

2003-8-25 · 6. Maximum pump efficiency occurs at approximately Q* = 0.6 Qmax . This is the best efficiency point BEP. At any other operating point, efficiency is less, pump head can be higher or lower, and BHP can be higher or lower. 7. At the BEP, Q = Q*, hp …

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• ### Pump Performance Curves and Similarity Laws

The affinity laws are a set of forumlas that predict the impact of a change in rotational speed or impeller diameter on the head and flow produced by a pump and power demanded by a pump. If you know the shape of a pump performance curve at a certain speed or with a certain impeller diameter, you can use the affinity laws to predict the performance ...

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• ### Pump Efficiency - uaex.edu

2014-4-16 · pump efficiency only. Operators may want their pumping unit efficiency to be evaluated for the complete unit. If so, the efficiency of the motor or engine will be included, and the overall efficiency will be lower than pump efficiency. WHP = HQ 3960 Where H is the total head of the water in feet and Q is the flow rate in gallons per minute.

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• ### The second law efficiency of a heat pump system ...

This paper describes various methods of calculating the second law efficiency for a heat pump system using water as a heat source and a heat sink. The arrangement is typical of many industrial, commercial, and residential applications, especially those dealing with waste heat recovery.

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• ### Efficiency Prediction of Centrifugal Pump Using the ...

2019-10-16 · This research is a continuation of efforts aimed at establishing the modified affinity laws for viscosity to predict the pump performance directly from a plot in terms of dimensionless numbers, i.e., flow coefficient, Reynolds number, head coefficient, and efficiency. The group has earlier proposed modified head coefficient affinity law.

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• ### DOE Indexes for Pump Efficiency Require Close

The DOE required changes to this standard, so HI updated the standard (HI 40.6-2016) so it is now aligned with federal law. This pump test standard defines the testing methods to determine the efficiency of a bare pump and allow for the addition of electric motors and variable speed drives based on Nominal Efficiency Tables or actual wire to ...

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• ### Basic Pump Parameters and the Affinity Laws

2020-4-10 · efficiency, and (3) drive efficiency. The overall pump operational efficiency (4) is the product of the three preceding efficiencies. A complete discussion of hydraulic efficiency will be provided when the subject of power is undertaken. In the context of this course, efficiency means hydraulic efficiency and it will be denoted with the symbol E.

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• ### Pump Performance - an overview | ScienceDirect Topics

Pump efficiency is expressed as pump power output divided by the pump power input, so the overall pump efficiency can be finally computed from the relationship: (7.3) η = ρgQH Tω × 100 % The pump head is a term derived from the Bernoulli formulation, an energy balance around the pump.

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• ### Pump Performance Curves and Similarity Laws

2003-8-25 · 6. Maximum pump efficiency occurs at approximately Q* = 0.6 Qmax . This is the best efficiency point BEP. At any other operating point, efficiency is less, pump head can be higher or lower, and BHP can be higher or lower. 7. At the BEP, Q = Q*, hp …

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• ### Pumps - Natural Resources Canada

2021-5-6 · April 2017 Technical bulletin on developing the standards. Webinar – April 2017. On March 4, 2017, Natural Resources Canada's (NRCan) Office of Energy Efficiency issued a Notice of Intent to amend Canada’s Energy Efficiency Regulations (the Regulations) to align pumps with standards in the United States. This technical bulletin has been released to initiate the consultation process and to ...

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• ### How To Use Affinity Laws to Calculate A New Best ...

2021-5-13 · Using the affinity laws, it is possible to determine approximate curves to estimate the centrifugal pump's new best efficiency point. Centrifugal pump affinity laws provide a method to determine a new pump operating point when a performance curve that indicates performance with different impeller diameters or operating speeds is not available.

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• ### Federal Pump Rule Established| Pool & Spa News

2017-5-24 · After working with manufacturers, utility companies and energy-efficiency advocates, the U.S. Department of Energy has finalized a federal regulation setting forth minimum efficiency standards that a pool pump must meet to enter commerce in the United States.

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• ### Efficiency degrade law under cavitation conditions of ...

Efficiency degrade law under cavitation conditions of centrifugal pump with inducer May 2011 Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering 29(3):185-189

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• ### Efficiency Prediction of Centrifugal Pump Using the ...

2019-10-16 · This research is a continuation of efforts aimed at establishing the modified affinity laws for viscosity to predict the pump performance directly from a plot in terms of dimensionless numbers, i.e., flow coefficient, Reynolds number, head coefficient, and efficiency. The group has earlier proposed modified head coefficient affinity law.

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• ### Pump Laws Review and Equations - Engineers Edge

Pump Laws Review and Equations. Centrifugal pumps generally obey what are known as the pump laws. These laws state that the flow rate or capacity is directly proportional to the pump speed; the discharge head is directly proportional to the square of the pump speed; and the power required by the pump motor is directly proportional to the cube of the pump speed.

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• ### How To Use Affinity Laws to Calculate A New Best ...

2021-5-13 · Using the affinity laws, it is possible to determine approximate curves to estimate the centrifugal pump's new best efficiency point. Centrifugal pump affinity laws provide a method to determine a new pump operating point when a performance curve that indicates performance with different impeller diameters or operating speeds is not available.

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• ### Preservation of Efficiency - Affinity Revisited | Pumps ...

2006-11-6 · This recirculation or “repumping”, as it could be called, reduces the hydraulic efficiency of the pump. The accuracy of the affinity laws is also sacrificed with this reduction in efficiency. According to the affinity laws, the 6-in impeller should produce a BEP flow of 466-GPM at a head of 111-ft; however, as you can see, its flow is just ...

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• ### homework and exercises - Can a heat pump have

2019-7-3 · A heat pump is not a heat engine. It is a heat engine in reverse. It's Coefficient of Performance (the term used instead of efficiency) is normally greater …

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• ### Energy Tips – Pumping Systems

2014-5-22 · to flow. This increase in pressure or head requirements shifts the pump’s operating point to the left along its performance curve, and, typically, away from its best efficiency point. The result is a loss in efficiency. Adjustable speed drives (ASDs) provide an efficient flow control alternative by varying a pump’s rotational speed.

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• ### Heat pump efficiency calculations - Compressor

2021-4-24 · internal compressor efficiency: ηi=0.84 h1= hv(tv) = 402.56 kJ/kg h3 =hl(tsc,pc) =248.6 kJ/kg Now I tried finding out the following: a)Thermal power Q0 at the evaporator b)Compressor power c)efficiency of the heat pump (both COP and refrigeration cycle efficiency ε ) a)Q0=q0*mrf, where q0 = specific heat load, and mrf=mass floware for the ...

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• ### Incorporate Minimum Efficiency Requirements for

2021-5-13 · a Thermal efficiency (E t) is based on Hydronics Institute, Method to Determine Efficiency of Commercial Space Heating Boilers (HI BTS-2000, Rev. 06.07). b Boilers with input greater than 10,000,000 Btu/h are not covered by federal purchasing requirements. Minimum efficiency presented is consistent with ASRHAE 90.1-2016 Table 6.8.1-6

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• ### At What Temperature is a Heat Pump Not Effective?

2018-5-13 · Heat Pump Efficiency Outside Temperature Graph . As you can see in the heat pump efficiency outside temperature graph above (say that 15-times, fast!), as the temperature continues to go down from about 70 degrees (because no one besides my wife would have the heat on when it's above 70...), the demand for heat increases (green line above ...

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• ### Pump Laws Review and Equations - Engineers Edge

Pump Laws Review and Equations. Centrifugal pumps generally obey what are known as the pump laws. These laws state that the flow rate or capacity is directly proportional to the pump speed; the discharge head is directly proportional to the square of the pump speed; and the power required by the pump motor is directly proportional to the cube of the pump speed.

Get Price
• ### The second law efficiency of a heat pump system -

Various methods of calculating the second law efficiency for a heat pump system using water as a heat source and a heat sink are described. The arrangement is typical of many industrial, commercial, and residential applications, especially those dealing with waste heat recovery. An experimental system is used to obtain measurements, and these measurements are evaluated by the various ...

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• ### Centrifugal Pump Efficiency Prediction by Means of ...

2019-7-1 · Centrifugal Pump Efficiency Prediction by Means of Empirical Methods and Exact Navier - Stokes Solutions Fatsis Antonios ... measurements and the third one is a new empirical law which takes into account geometrical and operating centrifugal pump parameters. All …

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• ### Finding Your Pump”s Best Efficiency Point | PI Process ...

2006-1-17 · Part II — The best efficiency point (BEP) is about 85 percent of the shutoff head. The pump should be operated at, or close to, the best efficiency point. The key word here is 'about.' The law has exceptions, depending on the pump design, application, and liquid. However, this covers about 90 percent of all centrifugal pumps.

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• ### Thermodynamic method for measuring turbine/pump

2021-5-9 · The Instrumentation laboratory HRED, IIT Roorkee has recently developed capability to carry out Field efficiency by Thermodynamic testing method as per IEC 60041:1991: in addition to its vast experience of carrying out efficiency testing of over 250 hydropower plants of various capacity in different terrain and states by various other methods of Discharge method for Field efficiency test ...

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• ### Application Research on Testing Efficiency of Main ...

The efficiency of a drainage pump should be tested at regular intervals to master the status of the drainage pump in real time and thus achieve the goal of saving energy. The ultrasonic flowmeter method is traditionally used to measure the flow of the pump. But there are some defects in this kind of method of underground coal mine. This paper first introduces the principle of testing the main ...

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• ### Second Law Efficiency — Computational

2020-9-7 · Second Law Efficiency¶ A power plant receives two heat inputs, 25 kW at 825°C and 50 kW at 240°C, rejects heat to the environment at 20°C, and produces power of 12 kW. Calculate the second-law efficiency of the power plant.

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• ### Second Law Problems - Michigan State University

2002-3-26 · 9. The pressure of water is increased by the use of a pump from 14 to 40 psia. A rise in the water temperature from 60°F to 60.2°F is observed. Determine the irreversibility, the second law efficiency, and the isentropic efficiency of the pump.

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• ### Second Law of Thermodynamics

2017-10-20 · Thermal Efficiency The fraction of the heat input that is converted to net work ... The objective of a heat pump, is to maintain a heated space at a high temperature. 7 Spring 2003 ECE309: Chapter 5 13 ... A device that violates the first law of thermodynamics is called a perpetual-motion machine of the first kind

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• ### Federal Register :: Energy Conservation Program:

2018-9-11 · As amended by the Energy Efficiency Improvement Act of 2015, Public Law 114-11 (April 30, 2015), the Energy Policy and Conservation Act (EPCA or, in context, the Act), Public Law 94-163 (42 U.S.C. 6291-6309, as codified), authorizes DOE to issue a direct final rule establishing an energy conservation standard for a product on receipt of a ...

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• ### DOE Pump Efficiency Rulemaking

Rotodynamic Pump Efficiency Prediction Guideline: The HI Pump Efficiency Prediction Committee has begun to gather new pump performance data to update this important guideline that relates pump efficiency to pump type, specific speed, and pump size. Considerations such as surface roughness, internal clearances, mechanical losses, pumpage, impeller design and diameter trim, and thrust …

Get Price
• ### Pump Efficiency - uaex.edu

2014-4-16 · Pump Efficiency Pump efficiency is defined as the ratio of water horsepower output from the pump to the shaft horsepower input for the pump. Water horsepower is determined by the flow rate and pressure delivered from the pump. The shaft horsepower is delivered to the pump from the power unit, which usually is an electric motor or internal combustion

Get Price
• ### Pump Efficiency—What Is Efficiency?

2012-1-20 · The overall efficiency of a centrifugal pump is simply the ratio of the water (output) power to the shaft (input) power and is illustrated by the equation below: E f = P W P S Where:

Get Price
• ### Eight Things to Know About Pump Efficiency

2018-11-20 · The formal rule was introduced in January 2016, with a four-year window for pump manufacturers to comply with the efficiency standards. Manufacturers have a choice between redesigning existing products or discontinuing them. If pump models have not been recently redesigned, the DOE requires re-certification by the manufacturer to ensure compliance.

Get Price
• ### (PDF) Evaluating the Approximation of the Affinity

2013-12-1 · The pump affinity laws are widely used in adjusting pump performance curves from one pump or speed to another. In most cases, they work fairly well …

Get Price
• ### Energy Efficiency Considerations in Pumps and Pump

Typical Pump Efficiencies Pump only (brake, no motor) Non-clog centrifugal, 25 hp: 65% Submersible wastewater, 34 hp: 75% Vertical turbine, water, 30 hp: 81% End Suction, water, 30 hp: 75% Bigger is better: add about 5 points at 200 hp Slower is better: add a couple points below 1200 rpm

Get Price
• ### Pump Performance Curves and Similarity Laws

2003-8-25 · 6. Maximum pump efficiency occurs at approximately Q* = 0.6 Qmax . This is the best efficiency point BEP. At any other operating point, efficiency is less, pump head can be higher or lower, and BHP can be higher or lower. 7. At the BEP, Q = Q*, hp …

Get Price
• ### How To Use Affinity Laws to Calculate A New Best ...

2021-5-13 · Using the affinity laws, it is possible to determine approximate curves to estimate the centrifugal pump's new best efficiency point. Centrifugal pump affinity laws provide a method to determine a new pump operating point when a performance curve that indicates performance with different impeller diameters or operating speeds is not available.

Get Price
• ### Affinity Laws | Intro to Pumps

The affinity laws are a set of forumlas that predict the impact of a change in rotational speed or impeller diameter on the head and flow produced by a pump and power demanded by a pump. If you know the shape of a pump performance curve at a certain speed or with a certain impeller diameter, you can use the affinity laws to predict the performance ...

Get Price
• ### Pump Affinity Laws - Engineering ToolBox

2021-5-7 · Turbo machines affinity laws can be used to calculate volume capacity, head or power consumption in centrifugal pumps with changing speed or wheel diameters. The Affinity Laws of centrifugal pumps or fans indicates the influence on volume capacity, head (pressure) and/or power consumption of a pump or fan due to.

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• ### The second law efficiency of a heat pump system

Downloadable (with restrictions)! This paper describes various methods of calculating the second law efficiency for a heat pump system using water as a heat source and a heat sink. The arrangement is typical of many industrial, commercial, and residential applications, especially those dealing with waste heat recovery. An experimental system is used to obtain measurements, and these ...

Get Price
• ### Affinity Law and Efficiency of a Pump Curve | Physics

2016-2-12 · Homework Statement (Pump Curve given as attachment) [/B] Find the point where the pump is delivering 1,200 gpm at 45 ft of head. I. What is the pump efficiency (read from the pump curve data)? ii. What is the hp delivered to the water? iii. What is the shaft hp required to drive the pump...

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• ### Energy Efficiency Considerations in Pumps and Pump

Improving Pump Efficiency Don’t Design it Wrong Invest in a good predesign Decide how it will operate before messing around with layouts and equipment selection Pick pumps to operate efficiently operate at conditions where the pump will actually operate most of the time Consider variable speed drives or smaller pumps to

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• ### DOE Pump Regulations | Jandy

Effective July 19, 2021, new U.S. Department of Energy (DOE) regulations will go into effect that require Dedicated Purpose Pool Pumps (DP3) manufactured in or imported into the U.S. meet minimum energy-efficiency standards. There is no distinction in the regulations between variable-speed and non-variable speed pumps. The regulations simply require dedicated purpose pool pumps to meet minimum ...

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• ### HEADS AND EFFICIENCIES OF A CENTRIFUGAL PUMP

2021-5-12 · Overall efficiency will be defined as the ratio of power output of the pump to the power input to the pump. Power output of the pump in KW = Weight of water lifted (W) x H m /1000 Power input to the pump = Power supplied by the electric motor = S.P.

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• ### Experiment 9: Centrifugal Pump

2013-4-25 · whether the efficiency would lie above the line or to the right of the pump performance curve. Join the marked points to form a smooth curve. Repeat for other efficiency values. for example 35%.45% and 5090. to give a family of efficiency curves. Create and/or print a second head-flow rate graph for all pump frequencies.

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• ### Second Law of Thermodynamics - Simon Fraser University

2015-9-30 · The efficiency of all reversible heat engines operating between the two same reservoirs are the same. The thermal efficiency of a heat engine (reversible or irreversible) is: H L th Q Q 1 For the Carnot cycle, it can be shown: H L th Carnot T T , 1 Fig. 6: P‐v diagram for the Carnot cycle.

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• ### Heat Pump - Georgia State University

2018-10-27 · Heat Pump A heat pump is a device which applies external work to extract an amount of heat Q C from a cold reservoir and delivers heat Q H to a hot reservoir. A heat pump is subject to the same limitations from the second law of thermodynamics as any other heat engine and therefore a maximum efficiency can be calculated from the Carnot cycle.Heat Pumps are usually characterized by …

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• ### Pump Ed 101

2016-11-12 · On the pump side it computes specific speed, suction specific speed, min & max acceptable flow, actual pump efficiency and cost per 1000 gallons pumped just name a few. On the motor side it computes HP, torque, kVA, power cost per hour, voltage unbalance and …

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• ### Enhancing energy efficiency in buildings - BMWi

Pump replacement The German government provides funding for the replacement of old heat and hot water pumps with high-efficiency ones. Optimising heating systems The German government also provides funding for persons wishing to submit their existing heating systems to …

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