BUILDING TECHNOLOGIE

May 14, 2014

ASRAC Pumps Working Group Webinar Meeting

Metric: From Test Stand to PER
2

Overview

To Discuss Today:• Metric nomenclature

• How to use revised calculator

In Slide Deck for Review:

• Examples for different pump configurations

– Motor and driver part load loss factor

– Testing vs calculation options

To Discuss at Next RegNeg Meeting (May 28th and 29th):

• Impact of test procedure and metric on standard

• Comparison of MEI and PER

• Comments on material presented on May 14th webinar

• Implementation of PERCL and PERVL
3

Metric Applicability to Pump Configurations

Pump Configuration

Bare Pump* Bare Pump + Motor Bare Pump + 

Metric CoverageBare Pump PERCL Does not include motor efficiency Does not d

losses 

Bare Pump + Driver PERCL (w/ std. driver) PERCL Does not d

losses 

Bare Pump + Driver +

Controls

PERCL

(w/ std. driver

and controls)

PERCL

(w/ std. controls) P

Pump Motor

Pump Control M

• Define a unique, but similar, metric for controlled versus uncont

pumps

• Uncontrolled pumps ‐> Constant Load Pump Energy Rating 

• Controlled pumps ‐> Variable Load Pump Energy Rating (PE

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

bare pumps
4

Pump Energy Rating (PER) and Index (PEI) NomPump 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 (PERmax):

௜௡௜ܲ ௜߱෍ ൌ ࡸࢂ/ࡸ࡯ࡾࡱࡼ

௜

ൌ ࡸࢂ/ࡸ࡯ࡵࡱࡼ

௅௏/௅஼ܴܧܲ

௫௠௔ܴܧܲ
5

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 

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
6

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

– Could still account for drive efficiency
7

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
8

Pump Curve Example – Determining Bare Shaft Input P

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

Percent of BEP Flow
9

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 PumpwithManufacturerMotor

N/A

Tested performance

of bare pump with

manufacturer motor

(wire to water)

Tested perfo

pump with 

motor (w

Tested Pumpwith 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