BUILDING TECHNOLOGIE

June 18, 2014

ASRAC Pumps Working Group Meeting

PEI Metric & Test Procedure
2

PEI Calculator

Substantive:• Update minimally compliant motor efficiency tables from 10 CFR 431.25 to refle

published DOE motor standards

• Add minimum efficiency table for submersible motors

• Update C‐Values

– based on aggregated HI and DOE data

– revised for RS‐V

• Update C‐Values to reflect more PEI levels between PEI10 and PEI40

– suggest 10, 15, 20, 25, 30, 35, and 40 and drop C‐Values higher than 40

• Implement tabs to enter tested wire‐to‐water input power data and calculate P

• Implement new motor loss curve equation (slightly different coefficients based 

conservative assumption)

– new NEMA data

Editorial• Change nomenclature to PEI for Index and PER for numerator or denominator v

(consistent with Nomenclature B option presented at the May 28‐29 RegNeg m

• Increase number of rows on each tab to a higher number (2000?)
3

BEP Flow Rate Determination

– In accordance with HI 40.6, sweep through at least seven flow 

from shutoff to maximum flow rate

• HI 40.6 requires points of approximately 40, 60, 75, 90, 100, 110

of the flow rate at the expected BEP of the pump (if the actual B

flow is displaced by more than 5% of the expected value, then th

be repeated).

• Record flow rate, pump head, torque and speed at each point

• Calculate efficiency at each of the points

– BEP is determined by finding maximum of best fit curve of eff

flow rate

% of BEP

flow

Flow Rate

(GPM) Head (ft)

Speed

(RPM)

Torque

(lb‐in)

Hydraulic

Power

(hp)

Shaft input

power (hp) η (

128 1200.59 141.51 1774.10 1977.14 41.76 55.65 75108 1012.80 157.91 1774.63 1782.87 39.31 50.20 78100 939.62 162.58 1774.80 1721.36 37.55 48.47 77

91 851.24 169.44 1775.86 1613.80 35.46 45.47 7776 709.87 178.40 1775.85 1458.85 31.13 41.11 7558 547.19 186.61 1777.84 1251.15 25.10 35.29 7148 449.06 189.67 1778.80 1112.42 20.94 31.40 66
4

Pump Curve Example – Determining BEP

25% 50% 75% 100% 110% 

Percent of BEP Flow
5

Determining Bare Shaft Pump Input Power

– After determining BEP flow, part load power is determined th

regression of pump shaft input power vs flow rate for all data p

50% of BEP flow

• At very low part load, pump shaft input power vs flow rate curve 

• Using best fit linear regression, obtain pump shaft input power f

(QBEP, Q75%, Q110%)

y = 0.031x + 18.805

R2 = 0.9968

0

102030405060

0 500 1000 1500

Pump shaft input power (hp)

Flow rate (GPM)

Above 50% BEP flowBelow 50% BEP flow

% of BEP

flow

Flow R

(GPM

100 940 

75 705 

110 1034 

– Instead could linea

between points to 

input power at part 

– Could also establish 

which interpolation 
6

Pump Curve Example – Determining Bare Shaft Input P

25% 50% 75% 100% 110% 120%

Percent of BEP Flow
7

PER Test Procedure Options

Pump Configuration

Bare Pump* Bare Pump + Motor Bare Pump + 

Test Procedure Options

Tested BarePump +

Calculations

Tested bare pump

performance + DOE

minimum efficiency

motor with assumed

part load losses

Tested bare pump

performance +

manufacturer motor

with assumed part

load losses

Tested 

performance 

motor with as

lo

Tested Pump

withManufacturerMotor

N/A

Tested performance

of bare pump with

manufacturer motor

(wire to water)

Tested perfo

pump with 

motor (w

Tested Pump

with Motorand Controls

N/A N/A

Tested perfo

pump with 

motor and c

syste

Pump Motor

Pump Control M

*Pumps sold with non‐electric drives could be rated as bare pumps
8

×

standardized motor

efficiency and default

part load curve

MOTOR

pump performance data

from pump test at rated

speed

Determining Bare Pump PERCL

×

standardized co

performance 

Controls

• Pi values are the linearly‐fit shaft input power to the pump (speed x torque) at 

• i = 75%, 100%, and 110% of flow rate at BEP of the pump

• Equal weighting

• Standardized Motor Performance

• Enclosed motor that is minimally compliant with DOE’s motor regulation

for general purpose motors (subtype I) for all pumps except ESCC and ge

motors (subtype II) for ESCC pumps

• HP used will be next HP above brake horsepower at 120% of BEP HP

• Poles will be based on speed at which pump is being rated

• Standardized Controls Performance

• Drive efficiency = 100% (since no drive)
9

• Determine bare shaft input power at Q75%, Q100% and Q110% of B

૚.૚࣓ ൅ ࡼࡱ࡮ࡸ ൅ ࡼࡱ࡮ࡼ ࡼࡱ࡮࣓ ൅ ૞ૠ.૙ࡸ ൅ ૞ૠ.૙ࡼ ૞ૠ.૙࣓ ൌ ࡸ࡯ࡾࡱࡼ

Determining Bare Pump Performance

Load Point Flow rate [GPM] Pump brake hp [HP]

Q110% 1034 50.89

Q100% 940 47.98

Q75% 705 40.69

ࡸ࡯ࡾࡱࡼ ൌ ૚ ૜ൗ ൈ ૝૙. ૟ૢ࢖ࢎ ൅ ࡸ૙.ૠ૞ ൅ ૚ ૜ൗ ൈ ૝ૠ. ૡૢ࢖ࢎ ൅ ࡼࡱ࡮ࡸ૜ ૚ ൅ ൗ ൈ 
10

Determining Part Load Motor Losses

The fractional motor losses at each load point i (Li) are calculated as the ra

motor losses (Lrated) multiplied by the part‐load loss factor (yi), which is calcubic polynomial* of the load fraction on the motor (xi):

ܮ ௜ൌ ܮ௔௥௧௘ௗ ∗ ݕ݅ ൌ ܮ௔௥௧௘ௗ ∗ ܽ∗ݔ௜ଷ ൅ܾ∗ݔ௜ଶ ൅ܿ∗ݔ ൅ ௜݀

ൌ ܮ௔௥௧௘ௗ ∗ ܽ ∗

ܲ௜

݁ݖܵ݅ݎ݋ݐ݋ܯ

ଷ

൅ܾ∗

ܲ௜

݁ݖܵ݅ݎ݋ݐ݋ܯ

ଶ

൅ܿ∗

ܲ௜

ݎ݋ݐ݋ܯ

Where:

• Li = the fractional load loss of the motor at load point i (hp);

• Lrated = the rated full load motor losses as determined in accorda

DOE test procedure for motors at 10 CFR 431 subpart B (hp);

• yi = the part‐load loss factor;

• xi = the load fraction for the motor at each load point i;

• Pi = the shaft input power to the bare shaft pump (hp);

• MotorSize = the nominal rated output power of the motor (hp); 

• i = Percentage of flow at the best efficiency point (BEP) of the pu

*A different cubic polynomial (i.e. different a, b, c, and d coefficients) cou

assumed based on the rotating speed (2‐pole vs. 4‐pole) and motor desig

vs. TEFC) or a single curve should be assumed for all

motors
11

Cubic Polynomial

Coefficient Conservative ݂(ݔ (Old Motor C

Data

a ‐0.0118 0.192

b 0.3515 0.173

c 0.0599 0.202

d 0.6004 0.432

Motor Loss Curve – Example (ODP Motor 3600 

y = ‐0.0118x3 + 0.3515x2 + 0.0599x + 0.6004

R2 = 1

0

0.10.20.30.40.50.60.70.80.9

1

0 0.2 0.4 0.6 0.8 1

fractional load loss

fractional load power

maximum valuesconservative valuesold curve
12

Motor Efficiency for Non‐Covered Motors• PERmax requires a minimally compliant pump/motor

– Minimum motor efficiency needs to be determined and list

procedure for determination of PEI

– This is applicable for:

• Submersible pumps

• Other pumps?

• To generate non‐covered motor efficiency tables:

– Survey industry literature to determine available motor eff

each hp bin

– Select lowest efficiency available in each hp bin as minimum 

to be used as default motor efficiency

• Could also apply a scaling factor to ensure value is a minimum
13

Accounting for Motor Losses

• Calculate the fractional load loss at each flow point using: ܮ ௜ൌ ܮ

– Where Li is the fractional load loss at each flow point in hp, Lfull,rated is the full 

determined in accordance with 10 CFR 431.25 (subpart B) in hp, and yi is the 

factor for each flow point

• Calculate the fractional input power as follows: ܲ௜௡௜ ൌ ܲ௜ ൅ ܮ௜

– Where Pi is the bare shaft input power in hp and the fractional load loss at ea

Lfull,rated is the full load losses determined in accordance with 10 CFR 431.25 (

– Calculate fractional input power as follows: Piin = Pi + Li

% BEP flow

Bare pump

shaft input

power (hp)

Load

fraction

(xi)

Part load loss

factor (yi)

Fractional load

loss (hp)

F

110 50.89 0.85 0.84 3.45 100 47.98 0.80 0.80 3.27 

75 40.69 0.68 0.69 2.84 
14

Determining Bare Pump Performance ‐ Calcula

• Calculate PERCL by weighting each of the input power v

follows:

• PERCL is based on motor efficiency of 93.6%, obtained 

motor regulation (10 CFR 431.25)

• Then calculate PEICL as a ratio of the pump PERCL and t

a minimally compliant pump:

ൌ ࡸ࡯ࡾࡱࡼ

૚

൅ ࢖ࢎ	૜૞ .૜૝ ૜

૚

൅ ࢖ࢎ	૞૛ .૚૞ ૜

૚

	૞૜ .૝૞ ૜

࢖ࢎ	૚ૠ ૢ. ૝ൌ ࡸ࡯ࡾࡱࡼ

ൌ ࡸ࡯ࡵࡱࡼ

௅஼ܴܧܲ

ௌ௧ௗܴܧܲ

ൌ

݌49.71݄

ௌ௧ௗܴܧܲ
15

×

manufacturer motor

efficiency at full and part

load

MOTOR

Bare Pump + Motor Test Procedure

Ma

pai

wit

pump performance 

data from pump

test at rated speed

standardized

controls

performance = 1

Controls ×

MOTOR PUMP

Ma

me

p

standardized

controls

performance = 1

Controls

×

pump+motor performance data

A

B
16

Determining Bare Pump + Motor PERCL

• Calculate PER using the same method as for the bare shaft pum

– Incorporate the rated motor efficiency rather than DOE minimum 

• Pi values are the tested shaft input power to the pump (speed x 

each load point i

– i = 75%, 100%, and 110% of flow rate at BEP of the pump

– Equal weighting

• Manufacturer Motor Performance

– Lrated is the full load losses of a motor that is paired with the pump

• Standardized Controls Performance

– Drive efficiency = 100% (since no drive)

૚.૚࣓ ൅ ࡼࡱ࡮ࡸ ൅ ࡼࡱ࡮ࡼ ࡼࡱ࡮࣓ ൅ ૞ૠ.૙ࡸ ൅ ૞ૠ.૙ࡼ ૞ૠ.૙࣓ ൌ ࡸ࡯ࡾࡱࡼ

ࡸ࡯ࡾࡱࡼ ൌ ૚ ૜ൗ ൈ ૝૙. ૟ૢ࢖ࢎ ൅ ࡸ૙.ૠ૞ ൅ ૚ ૜ൗ ൈ ૝ૠ. ૡૢ࢖ࢎ ൅ ࡼࡱ࡮ࡸ૜ ૚ ൅ ൗ ൈ 
17

Determining Bare Pump + Motor Performance –Calculation Method

• Assume 60 hp motor with ηmotor,meas = 95% (Lfull,rated = 3.16 hp) and 

as before:

• Then calculate PEICL as a ratio of the pump PERCL and the PERmax f

compliant pump:

ൌ ࡸ࡯ࡾࡱࡼ

૚

൅ ࢖ࢎ	૝ૢ .૛૝ ૜

૚

൅ ࢖ࢎ	૞૞ .૙૞ ૜

૚

ࢎ	૙૟ .૜૞ ૜

࢖ࢎ	૜૙ ૢ.૝ ൌ ࡾࡱࡼ

% BEP flow

Bare pump

shaft input

power (hp)

Load

fraction

(xi)

Part load loss

factor (yi)

Fractional load

loss (hp)

Fr

110 50.89 0.85 0.84 2.66 100 47.98 0.80 0.80 2.51 

75 40.69 0.68 0.69 2.18 

ൌ ࡸ࡯ࡵࡱࡼ

௅஼ܴܧܲ

௫௠௔ܴܧܲ

ൌ

݌49.03݄

௫௠௔ܴܧܲ
18

Accounting for Motor Losses

• The proposed PERCL,PERVL, and PERmax calculations require assum

regarding how motors perform at part load

• Options to address motor efficiency in the PER calculations inclu

*Conservative = will result in a higher PER for calculation

method, as compared to testing

Option Accuracy Simplicity Burden Use only fullload efficiency Low High Low Use full loadlosses and

default losscurves

Medium Medium Medium 

Use measured

part loadefficiencies

High High

High – requires part load motortest procedure (IEEE 112B forpumps with motors and/or CSAC‐838 for pumps with motors

and controls), could consider

AEDM
19

B Controls MOTOR PUMP

Bare Pump + Motor + Controls Test Procedure

Ma

me

p

co

×

manufacturer or default

motor efficiency

A MOTOR

Ma

pai

with 

m

de

pump performance

data from pump test

at rated speed

default controls

performance

× Controls
20

Determining Bare Pump + Motor + Controls PE• Pump Performance

– Pi values are the tested shaft input power to the pump (speed x to

load point i

• i = 25%, 50%, 75%, and 100% of flow rate at BEP of the pump

• 100% of BEP flow is only tested point

• Equal weighting

• Motor Performance (Losses)

– Lrated is the full load losses of a motor that is paired with the pump 

sold with motors and unique part load loss curves

• Controls Performance

– Benefit is captured in calculation of bare shaft input power

– Drive efficiency based on NEMA and HI provided data with assum

curve

ܲܧܴ ௅௏ൌ ߱.ଶହ ܲ௜௡.ଶହ ൅ ߱.ହ଴ ܲ௜௡.ହ଴ ൅ ߱଴.଻ହ ܲ௜௡଴.଻ହ ൅ ߱஻ா௉ ܲ௜௡஻ா௉

ൌ

14 ܲ.ଶହ ൅ ܮ.ଶହ ൅

14 ܲ.ହ଴ ൅ ܮ.ହ଴ ൅

14 ܲ଴.଻ହ ൅ ܮ଴.଻ହ ൅

14 ܲ஻ா௉ 

Where Pi, Li other than 100% BEP are obtained

from control load curve
21

0

50

100150200250300350

0 200 400 600 800 1000 1200 1400

Head (ft)

flow rate (GPM)

Original VFD New VFD LoExample Pum

Best Efficiency Poin

20% of BEP Head

Realized potential savings

Unrealized savings

Control Load Curve• Proposed: load profile with a static offset

– Head with flow is offset: ܪ ൌ ߙܳଶ ൅ ܪௌ௧௔௧௜௖– Assume: static offset is 20% of BEP head (other offsets could be c

– Given QBEP and HBEP, the system curve becomes:

• ܪ ൌ 0.8 ுಳಶು

ொಳಶುమ ܳଶ ൅ 0.2ܪ஻ா௉

• This curve passes through both BEP and the pump head intercept at 
22

Control factor: VFD ‐ Calculations

• The flow at input power to the bare pump are available from th

pump performance:

• Using the control curve, the bare pump shaft input power at 75

flow (660 GPM) is:

• Applied to all rating points yields the following:

ࡳ	૙૝ૢ ൌࡼࡱ࡮ࡽ															;ܘܐ	ૡૢ .ૠ ૝ൌ ࡼࡱ࡮ࡼ

૚ࡼ

࢖ࢋ࢈ࡼ

࢖ࢋ࢈ࡽࡽ ૛ .૙ ൅ ૛ ࢖ࢋ࢈ࡽࡽ ૡ . ૙ൌ

૞ૠ.૙ࡼ

૝ૠ. ૢૡ	࢖ࢎ

ൌ ૙. ૡ

ࡹࡼࡳ	૞૙ૠࡹࡼࡳ	૙૝ૢ

૛

൅ ૙. ૛

ࡹࡼࡳ	૞૙ૠࡹࡼࡳ	૙૝ૢ

ࡼ૙.ૠ૞ ൌ ૝ૠ. ૢૡ	࢖ࢎ૙ . ૡ . ૠ૞ ૛ ൅ ૙. ૛ . ૠ૞ ൌ ૛૜. ૜ૢ	࢖ࢎ

Load Point Flow (GPM) Bare pump input

power (hp)

QBEP 940 47.98

Q75% 705 23.39Q50% 470 9.60Q25% 235 3.00
23

Control factor: VFD ‐ Calculations

• Assuming the motor is a 95% efficient motor (as befor

drive is 96% efficient, the controlled PER (PERVL) is the

• This assumes motor and drive efficiency are combined 

part load losses. Could also:

– Apply controls efficiency directly (no account of part load pe

– Apply separate part load loss/efficiency curve for controls

• Then calculate PEIVL as a ratio of the pump PERVL and t

for a minimally compliant pump:

. ൅ ૙࢖ࢎ	ૢ૜ .૜૛ ૞૛ .૙ ൅ ࢖ࢎ	૚૙ .૛૚ ૞૛ .૙ ൅ 	࢖ࢎ	૝૛ .૞	 ૞૛ .૙ ൌ ࡸࢂࡾࡱࡼ

࢖ࢎ	૜૜ .૜૛ ൌ ࢉࡾࡱࡼ

ൌ ࡸࢂࡵࡱࡼ

௅௏ܴܧܲ

௫௠௔ܴܧܲ

ൌ

݌23.33݄

௫௠௔ܴܧܲ
24

PER Calculation Comparison Summary• PER accounts for savings from control and from more 

motor

Equipment Configuration PER

Bare Pump 49.78Pump + 95% Eff. Motor 49.03

Pump + Motor + VSD 23.33
25

Bare Pump + Motor – Test Method• Referred to as “string test” in HI 14.6

– Test similar to bare shaft test procedure,

except motor input power (Pin,i) is measured

directly

• If motor efficiency changes significantly from rated v

tested PER will vary from calculated value

MOTOR PUMP

Manu

measu

pum

c

standardized controls

performance

Controls ×

Pump+moto

data from 

rated 

ࡼ ૚.૚࣓ ൅ ࡼࡱ࡮,࢔࢏ࡼ ࡼࡱ࡮࣓ ൅ ૞ૠ.૙,࢔࢏ࡼ ૞ૠ.૙࣓ ൌ ࡾࡱࡼ
26

String test data (for pump + motor)• Input electrical power was measured for the exampl

used for the calculation of PER in earlier examples

Load Point Flow (GPM) String test input

power (hp)

Q110% 1034 53.58

QBEP 940 50.46

Q75% 705 42.71

Q50% 470 35.07Q25% 235 27.49

ൌ ࡾࡱࡼ

૚

൅ ࢖ࢎ	૚ૠ .૜ ૝૛

૚

൅ ࢖ࢎ	૟૝ .૙૞ ૜

૚

ࢎ	ૡ ૞.૜ ૞૜

࢖ࢎ	૜૙ ૢ.૝ ൌ ࢉ࢒ࢇࢉࡾࡱࡼ ࢖ࢎ	૛ૢ .ૡ ૝ൌ ࢚࢙ࢋ࢚ࡾࡱࡼ
27

B Controls MOTOR PUMP

Bare Pump + Motor + Controls Test Procedure

Ma

me

p

co

×

manufacturer or default

motor efficiency

A MOTOR

Ma

pai

with 

m

de

pump performance

data from pump test

at rated speed

default controls

performance

× Controls

• General test procedure is similar to HI 40.6 except

• Measure input power to the drive using instruments capabl

measuring current, voltage and real power, designed as per 

61000‐4‐7, and having an accuracy of ± 0.2% of full scale at 

fundamental supply source frequency.

• Any other inputs or changes?
28

Application of Calculation and Testing Based M• Is physical testing more appropriate for some equipment classe

calculation method is more appropriate for others?

– e.g. ESCC pumps, pumps sold with non‐DOE motors

• What to do about pumps sold with motors sized differently fro

specified in the test procedure

Test Method Pros ConsCalculationMethod

Repeatable;Less burdensome

Does not differentiat

controls performancAssumptions regardi

motor/controls effici

changing load requir

Decreased accuracy

Physical TestMethod

Accurate;Differentiates performance of

different motor/controlsequipment at full and part load

Burdensome;Drive test data not av
29

Applying Test Data to Metric
30

Pump Energy Rating (PER) and Index (PEI) NomePump Energy Rating (PER) CL and VL: equally weighted average elec

power to the ‘pump’ measured (or calculated) at the driver input or, 

controls input, over a specified load profile:

Where:

• wi = weight at each load point i

• Pini = power input to the “pump” at the driver, inclusive of the 

present, (hp)

• i = Percentage of flow at the best efficiency point (BEP) of the 

• i = 110%, 100%, 75% of Best Efficiency Point (BEP) flow at 

for uncontrolled pumps

• i = 25%, 50%, 75%, and 100% of BEP flow at nominal spee

sold with motors and controls

Pump Energy Index (PEI) CL and VL: PER CL and VL, for a given pump 

the PERCL for a minimally compliant pump (PERSTD):

௜௡௜ܲ ௜߱෍ ൌ ࡸࢂ/ࡸ࡯ࡾࡱࡼ

௜

ൌ ࡸ࡯ࡵࡱࡼ

௅஼ܴܧܲ

஽்ௌܴܧܲ

ൌ ࡸࢂࡵࡱࡼ

௅௏ܴܧܲ

஽்ௌܴܧܲ
31

Determining PEICL for an Uncontrolled Pump

• Pump Performance

– Pi values are the tested shaft input power to the pump (speed x torque) at ea

• i = 75%, 100%, and 110% of flow rate at BEP of the pump

• Equal weighting

• Motor Performance (Losses)

– Lrated is the full load losses of a motor that is paired with the pump for pumps 

– Lrated is the full load losses of an enclosed motor that is minimally compliant w

regulations (10 CFR 431.25) for general purpose motors (subtype I) for all pu

and general purpose motors (subtype II) for ESCC pumps

ܲܫܧ ௅஼ൌ ఠబ.ళఱ ௉೔೙బ.ళఱ ାఠಳಶು ௉೔೙ಳಶು ାఠభ.భ ௉೔೙భ.భ ௉ாோ೘ೌೣ

ൌ

߱଴.଻ହ ܲ௜௡଴.଻ହ ൅ ߱஻ா௉ ܲ௜௡஻ா௉ ൅ ߱ଵ.ଵ ܲ௜௡ଵ.ଵ

߱଴.଻ହ

ܲு௬ௗ௥௢,଴.଻ହ

0.95 ∗ ߟ௣௨௠௣ ൅ ܮ଴.଻ହ ൅ ߱஻ா௉

ܲு௬ௗ௥௢,஻ா௉

ߟ௣௨௠௣ ൅ ܮ஻ா௉ ൅ ߱ଵ.ଵ

ܲு௬ௗ௥௢

0.985 ∗ ߟ

=

భయ

∗ ௉బ.ళఱା௅బ.ళఱ ାభయ∗ ௉ಳಶುା௅ಳಶು ାభయ∗ ௉భ.భା௅భ.భ

భయ

∗

ುಹ೤೏ೝ೚,బ.ళఱ

బ.వఱ∗ആ೛ೠ೘೛ା௅బ.ళఱ ାభయ∗ ುಹ೤೏ೝ೚,ಳಶು ആ೛ೠ೘೛ ା௅ಳಶು ାభయ∗ ುಹ೤೏ೝ೚,భ.భ బ.వఴఱ∗ആ೛ೠ೘೛ା௅భ.భ

• No Controls Performance
32

Determining PEIVL for a Controlled Pump

ൌ௏௅ ܫܧܲ

1

η௖௧௥௟

߱଴.ଶହ ܲ௜௡଴.ଶହ ൅ ߱଴.ହ଴ ܲ௜௡଴.ହ଴ ൅ ߱଴.଻ହ ܲ௜௡଴.଻ହ ൅ ߱஻ா௉ ܲ

߱଴.଻ହ

ܲு௬ௗ௥௢,଴.଻ହ

0.95 ∗ ߟ௣௨௠௣ ൅ ܮ଴.଻ହ ൅ ߱஻ா௉

ܲு௬ௗ௥௢,஻ா௉

ߟ௣௨௠௣ ൅ ܮ஻ா௉ ൅ ߱ଵ.ଵ

ܲ

0.9

=

ଵ

஗೎೟ೝ೗

భర

௉೔೙బ.మఱ ାభర ௉೔೙బ.ఱబ ାభర ௉೔೙బ.ళఱ ାభర ௉೔೙ಳಶು

ఠబ.ళఱ

ುಹ೤೏ೝ೚,బ.ళఱ

బ.వఱ∗ആ೛ೠ೘೛ା௅బ.ళఱ ାఠಳಶು

ುಹ೤೏ೝ೚,ಳಶು

ആ೛ೠ೘೛

ା௅ಳಶು ାఠభ.భ

ುಹ೤೏ೝ೚,భ.భ

బ.వఴఱ∗ആ೛ೠ೘೛

• Pump Performance

– Pi values are the tested shaft input power to the pump (speed x torque) at ea

• i = 25%, 50%, 75%, and 100% of flow rate at BEP of the pump

• Equal weighting

• Motor Performance (Losses)

– Lrated is the full load losses of a motor that is paired with the pump for pumps 

• Controls Performance

– Benefit is captured in calculation of bare shaft input power

– Will account for drive efficiency
33

Minimally Compliant Pump

• PER for a minimally compliant pump

– Based on PER Standard set through Standards analysis

– Assumes a pump curve shape for the minimally compliant pump and always 

controls

– Motor losses are that of a minimally compliant enclosed motor for the appr

– The minimally compliant pump efficiency is calculated for each pump type b

of flow and speed

ܲܧܴ௔௠௫ ൌ ߱଴.଻ହ

ܲு௬ௗ௥௢,଴.଻ହ

0.95 ∗ ߟ௣௨௠௣,௠௜௡ ൅ ܮ଴.଻ହ ൅ ߱஻ா௉

ܲு௬ௗ௥௢,஻ா௉

௣௠௨௣ߟ

൅ ܮ஻ா௉ ൅ ߱ଵ.ଵ

ܲு

0.985 

ߟ௣௨௠௣ ൌ 88.59 ∗ ln ܰݏ ൅ 13.46 ∗ ln ܳ௠௘௧௥௜௖ െ 11.48 ∗ ln ܰݏ ଶ െ 0.85 ∗ ln ܳ 

∗ ln ܳ െܥ

• Where:

– Ns is the specific speed of the pump in metric units,

– Q is the flow rate of the pump at BEP in m3/hr,

– C is the C‐value of the surface, which is set based on the speed of rotation o

– All values are for the pump at 50 Hz
34

Test Procedure Recommendations

• Pump test procedure should be in accordance with HI 40.6 for d

bare pump performance

– VOTE: 13 YES, 2 ABSTAIN, 1 ABSENT

• Pump Energy Rating (PER) CL and VL: equally weighted average 

power to the ‘pump’ measured (or calculated) at the driver inpu

present, controls input, over a specified load profile:

– Where:

– wi = weight at each load point i

– Pini = power input to the “pump” at the driver, inclusive of the controls 

– i = Percentage of flow at the best efficiency point (BEP) of the pump

• i = 110%, 100%, 75% of Best Efficiency Point (BEP) flow at nomina

uncontrolled pumps

• i = 25%, 50%, 75%, and 100% of BEP flow at nominal speed for pu

motors and controls

• Pump Energy Index (PEI) CL and VL: PERCL and PERVL, for a given 

over the PERCL for a minimally compliant pump (PERSTD) serving the 

hydraulic load:

– VOTE: 14 YES, 1 ABSTAIN, 1 ABSENT

ൌ ࡸ࡯ࡵࡱࡼ

௅஼ܴܧܲ

஽்ௌܴܧܲ

ൌ ࡸࢂࡵࡱࡼ

௅௏ܴܧܲ

஽்ௌܴܧܲ

௜௡௜ܲ ௜߱෍ ൌ ࡸ࡯ࡾࡱࡼ

௜

ࡸࢂࡾࡱࡼ
35

Label Recommendations

Pump Configuration

Bare Pump* Bare Pump + Motor Bare Pump + Mo

Standard PEICL (w/ std. motor) PEICL PEILabel

PEICL

(w/ std. motor),

Model number, and

Impeller diameter

for each unit

PEICL,

Model number, and

Impeller diameter for

each unit

PEI

Model num

Impeller diam

un

Pump Motor

Pump Control Moto

• Pumps are labeled based on the configuration in which they are s

• Uncontrolled pumps ‐> Constant Load Pump Energy Index (P

• Controlled pumps ‐> Variable Load Pump Energy Index (PEIVL

• The following information would be required to be included on a 

nameplate:

VOTE: 13 YES, 2 ABSTAIN, 1 ABSENT
36

Recommended Data to be Included in Certification

Reports/Database

• Manufacturer name• Model number(s)

• Equipment class

• PEICL or PEIVL as applicable

• BEP flow rate and head

• Rated speed• Number of stages tested• Full impeller diameter

• Whether the PEICL or PEIVL is calculated or tested

• Input power to the pump at each load point i (ܲ௜௡௜)

VOTE: 13 YES, 2 ABSTAIN, 1 ABSENT
37

Number of Stages for Testing of VT‐S and RS‐V • Certification for RS‐V and VT‐S pumps shall be based 

testing with the following number of stages:

– RS‐V = 3 stages

– VT‐S = 9 stages

– Unless a model is not available with that specific number o

the given scope, in which case the model will be tested and 

with the next higher number of stages.

VOTE: 14 YES, 1 ABSTAIN, 1 ABSENT
38

Recommendations Regarding Circulators & Poo

• Previous proposal

– ASRAC approved negotiation by the end of the year

• Revised proposed process on circulators

– EE advocates and manufacturers will informally discuss a circ

proposal to present to DOE as a preferred path

• EE advocates will send proposal for circulator scope and objecti

• Pump/circulator manufacturers will consider at Oct/Feb HI mee

respond

• Availability of informal analytical support an important variable

– ASRAC approved negotiation by the end of the year as a back 

• Proposed timeline

– Circulators NOPR by July 2015

– Demonstration of intent to initiate rulemaking on pool pump

– Subject to availability of DOE resources
39

Metric: Standard vs. Label
40

Metric Goals

1. Be objectively measureable

2. Represent the

performance of thecovered equipment

3. Differentiate performance among pump

models and pump configurations

(e.g. pumps sold with controls)

4. Communicate information

about pump performance tothe consumer

– May not be all the information

a consumer uses to make adecision

5. Compare the

efficiency ofa given pump

model to aminimum standard level

Metric

Test

Procedure

Tested

Performance

of Pump A

Tested

Performance

of Pump B

Bare Pump

Efficiency

or Energy

Use

Mot

Efficie

or En

Us

‘Pump’

Efficiency

or Energy

Use

=
41

Application of Standard vs. Label

Metric Goals Standard LabelBe objectively measureableRepresent the

performance of the

covered equipment

PEICL or PEIVL depending

on pump configuration

Represents the per

the equipment in b

(variable load) and 

(constant load) app

Differentiate performance

among pump models and

pump configurations (e.g.pumps sold with controls)

Communicate informationabout pump performance

to the consumer

N/A Consumer can com

performance with c

variable load to a c

application with no 

Compare the efficiency of agiven pump model to a

minimum standard level

PEI is an index to

standard level, socomparison is inherentin metric value

N/A
42

Potential Impacts on Market

• Consumers/Contractors: Providing both the PEICL and 

the label will provide information to consumers regarimproved performance of pumps with controls in varload applications

– may not be all the information a consumer uses to make a d

but is an indicator of the opportunity for savings

• Utilities: Utilities could choose to incentivize a PEIVL o

certain value for variable load applications to encoura

use of VFDs (which will have a different system curve 

other controls) and a PEICL of a certain value for constapplications
43

Other Label or Reporting Options• Energy use/yr

– Establishing weights as operating hours at each weight

• Assume an annual number of operating hours/yr

• Still equally weighted over 3 or 4 load points for uncontrolled 

controlled pumps

ࡸ࡯ࡾࡱࡼ/ࡸࢂ ൌ ෍߱௜ ܲ௜௡௜ ൌ ߱଴.଻ହ ܲ௜௡଴.଻ହ ൅ ߱஻ா௉ ܲ௜௡஻ா௉ ൅ ߱ଵ.ଵ ܲ௜௡ଵ

௜

ൌ

1	ܹ݇

݌݄	1.34

∗ ߱଴.଻ହ ܲ௜௡଴.଻ହ ൅ ߱஻ா௉ ܲ௜௡஻ா௉ ൅ ߱ଵ.ଵ ܲ௜௡ଵ.ଵ

ൌ

1	ܹ݇

݌݄	1.34

∗ 1,000	݄ݏݎ ∗ 	ܲ଴௡௜.଻ହ ൅ 1,000	݄ݏݎ ∗ 	ܲ஻௡௜ா௉ ൅ 1,000	݄ݏݎ ∗ ܲ

ൌ

1	ܹ݇

݌݄	1.34

ݏݎ݄	1,000 ൅ ݌3.40݄ ൅ ݌݄	47.66 ∗ 	ݏݎ݄	1,000 ൅ ݌3.01݄ ൅ ݌݄	40.16 ∗ 	ݏݎ݄	1,000 ∗

࢘࢟/ࢎࢃ࢑	ૠૡૠ , ૚૚૙ൌ ࡸ࡯ࡾࡱࡼ

࢘࢟/ࢎࢃ࢑	૙ૢ૝ ,ૡ ૝ൌ ࡸࢂࡾࡱࡼ
44

Back Up Slides
45

Generating a Motor Loss Curve

• Use part load motor efficiency at 25%, 50%, 75%, and 

rated load

– Used efficiency values from NEMA motor manufacturers

݁ݓ݋ܲ	݁݀ݐܴܽ	݂݋	100% 75%, 50%, 25%, ൌ ݔ

• Obtain the part load fraction of total motor loss

௅ிߟെ1 ݔ ߟെ1 ∗ ݔ ߟ ௅ிߟ ∗ݔൌ ݔ ݂
46

Generating a Default Motor Loss Curve

• Find the maximum values of ݂ ݔ for each load fractio

across the entire power range

• Create a polynomial curve from the maximum points

– Scale the curve ݂ ݔ௔௠ ௫ by a scaling factor (ݏ. ݂. (to obtain va

0.95 ൌ ݂. .ݏ	݁ݎ݄݁ݓ , ݂. .ݏ െ 1 ൅ ݂. .ݏ ∗ ௫ ௠௔ݔ ݂ ൌ ௦ ௖௢௡ݔ ݂ –

• Plot these values of ݂ ݔ for all four load points and d

coefficients of the best fit cubic polynomial

݀൅ݔ∗ܿ൅ ଶݔ∗ܾ൅ ଷݔ∗ܽൌ ݔ ݂
47

Cubic Polynomial

Coefficient Conservative ݂(ݔ (Old Motor C

Data

a ‐0.185 ‐0.130

b 0.7329 0.533

c ‐0.1565 ‐0.020

d 0.6086 0.618

Motor Loss Curve – Example (TEFC Motor 3600 

y = ‐0.185x3 + 0.7329x2 ‐ 0.1565x + 0.6086

R2 = 1

0

0.10.20.30.40.50.60.70.80.9

1

0 0.2 0.4 0.6 0.8 1

fractional load loss

fractional load power

maximum valuesconservativevaluesold curve
48

Cubic Polynomial

Coefficient Conservative ݂(ݔ (Old Motor C

Data

a ‐0.3831 ‐0.096

b 1.0539 0.562

c ‐0.3656 0.155

d 0.6948 0.377

Motor Loss Curve – Example (ODP Motor 1800 

y = ‐0.3831x3 + 1.0539x2 ‐ 0.3656x + 0.6948

R2 = 1

0

0.10.20.30.40.50.60.70.80.9

1

0 0.2 0.4 0.6 0.8 1

fractional load loss

fractional load power

maximum valuesconservativevaluesold curve
49

Cubic Polynomial

Coefficient Conservative ݂(ݔ (Old Motor C

Data

a ‐0.313 ‐0.288

b 0.9542 1.170

c ‐0.3111 ‐0.599

d 0.6699 0.717

Motor Loss Curve – Example (TEFC Motor 1800 

y = ‐0.313x3 + 0.9542x2 ‐ 0.3111x + 0.6699

R2 = 1

0

0.10.20.30.40.50.60.70.80.9

1

0 0.2 0.4 0.6 0.8 1

fractional load loss

fractional load power

maximum valuesconservativevaluesold curve
50

Motor Losses by HP

55.060.065.070.075.080.085.090.095.0

100.0

25% 50% 75% 100

Motor Efficiency

Percentage of Motor Load