U S Department of U

.

S. Department of

Energy Test Procedu

Changes for Condensing Changes for Condensing

Clothes Dryers

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EERE-2007-BT-STD-0010 COMMENT 13
Background

• Code of Federal Regulations Title 10 – E

Part 430 “Energy Conservation Program Consumer Products”

• Subpart A section 430 2 states Subpart A section 430.2 states “Electric c

Electric c

Dryer means a cabinet like appliance desto dry fabrics in a tumble-type Drum with 

air circulation The heat source is electricair circulation. The heat source is electric

the Drum and Blower(s) are driven by an Motor(s)”

• A di D S b B f P 430 Appendix D to Subpart B of Part 430 – U 

Test Method For Measuring The Energy Consumption of Clothes Dryers

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Whirlpool Corp

p y

EERE-2007-BT-STD-0010 COMMENT 13
Background – cont d’

• App p endix D procedure steps which confli

condensing Dryer:

– Paragraph 2.1 of section 2, “Installation” states: Install 

clothes Dryer in accordance with the manufacturer clothes Dryer in accordance with the manufacturer s’ in

in

The Dryer exhaust shall be restricted by adding the AHexhaust simulator described in 3.3.5 of HDL-1............

– Paragraph 2.8 of section 2, “Clothes Dryer preconditio

states: Before any test cycle, operate the Dryer withouload in the non-heat mode for (15) minutes or until the air temperature is varying less than (1) degree F for (1minutes whichever is longer in the test installation locminutes, whichever is longer, in the test installation loc

the ambient conditions within the specified test condititolerances of 2.2

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
Assessment

• The condensing y Dr er falls within the DO

definition for a clothes Dryer and thereforrequired to meet this energy standard

• Define non Define non-exhausted and exhausted Dry

exhausted and exhausted Dry

the DOE standard.

• Paragraph 2.1 of section 2 should state n

exh t dD austed Dryers are exempt f th 

t from the ex

requirement.

• Pa ag ap 8 o sect o , C ot es ye ragraph 2.8 of section 2, “Clothes Drye

preconditioning” needs to be revised to afor dryer preconditioning cycle differencebetween exhausted and non-exhausted D

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Whirlpool Corp

between exhausted and non exhausted D

EERE-2007-BT-STD-0010 COMMENT 13
Condensing Dryer Energ

R l esu

lts

Eurotech model EDC158 Whirlpool model AW

• Class “C” European energy 

rating

• (3.7) FT

3

• Class “B” European 

rating

• (3.7) FT

3

• (240) VAC @ (60) Hz• Unit has NO Air Cycle• (1) unit tested

• (230) VAC @ (50) H• Unit has an Air Cycl• (4) units tested

• Average energy factor = (2.86) 

lbs/Kwh for (3) cold runs

• Average energy factor = 

(3 16) lb /K h f (3) h t

• Average energy fact

lbs/Kwh for (4) cold 

• Average energy fac

(3.16) lb

s/K

w

h

for (3)

h

o

t runs (3 22) lb /K h f (8

• There is a (10.5) percent 

difference between “cold runs 

and hot runs

(3.22) lb

s/K

w

h

for (8

• There is a (5.9) perc

difference between “

and hot runs

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Whirlpool Corp

and hot runs and hot runs

EERE-2007-BT-STD-0010 COMMENT 13
Condensing Dryer Energ

R l ( i d) Resu

lts 

(cont

inued)

Whirlpool model AWZ9995 with additional run

see previous slide for model detail

Previous Data

• (4) unit tested• Average energy factor

= (3 04)

New Data

• (1) unit tested• Avera

ge energy fa

see previous slide for model detail

Average energy factor (3.04)

lbs/Kwh for (4) cold runs

• Average energy factor = 

(3.22) lbs/Kwh for (8) hot runs

A (5 9) t diff

g gy 

lbs/Kwh for (3) cold 

• Average energy fa

lbs/Kwh for (3) hot 

• A (5 4) percent diff

•

A (5.9) percen

t difference 

between cold & hot runs

•

A (5.4) percent diff

between cold & ho

• Average energy fa

lbs/Kwh for (3) pre

conditi d one

d runs w

cycle 

• A (2.9) percent diff

between cold & Pr

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Whirlpool Corp

conditioned runs

EERE-2007-BT-STD-0010 COMMENT 13
Temperature Results Temperature Results

• The Eurotech Condensing Dryer, model # The Eurotech Condensing Dryer, model

#

EDC158, was thermocoupled in (5) locati

• TC#1 - Ambient air OUT of the Condenser system• TC#2 - Ambient air INTO the Condenser system• TC #3 - Drum inlet air after the Condenser but befo

Heater Element

• TC #4 - Drum inlet air coming from the Heater Elem• TC #5 - Drum outlet air leaving the Drum

• See next slide for graphical view of the See next slide for graphical view of the

Condensing system

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
Thermocouple Location

Thermocouple Location

Condenser

Ambient Air In (Heat Exchan

(cold)

TC#2 

Heater

Element

Drum

TC#1

Ambient Air Out

(Hot) 

TC#5 

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
Temperature Data

E h urotec

h - C D li C 

Cotton 

D

elicate 

C

Eurotech EDC158 Condensing Dryer

C tt D li t C l C

otton 

D

elicate 

Cycle

130140150

Condenser, Outlet Condenser, Inlet Drum, Condenser to Element Drum, Inlet 

8090

100110120

(Degrees F

304050607080

Temperature (

0

1020

30

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 

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Time (minutes)

EERE-2007-BT-STD-0010 COMMENT 13
Temperature Data

Whi l l Whi

r

lpoo

l - Ai C l r 

Cyc

l

e

Whirlpool ADZ9995 Condensing Dryer

Air Cy g cle after Energy Test

120140

Condensing Air Outlet Condensing Air Inlet Outlet - Inlet

End of Energy Test

80

100

(degrees F) (80) degrees F

4060

Temperature (15) minutes

(11) D diff ti l ft (15) i t

0

20

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 

(11)

Degree differential after (15) minut

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Time (minutes)

EERE-2007-BT-STD-0010 COMMENT 13
Preliminary Summary Preliminary Summary

• Condensin

g y Dr

yer models are sold both w

and without “Air” Cycles 

• For a condensing Dryer model with an “A

cycle the current procedure is potentially cycle, the current procedure is potentially 

the condensing air system is considered exhaust

• Wh t h ld b d ith d i D Wh

a

t s

hould

be 

done with con

densing 

Dr

with NO “Air” cycle?

• E

u opea e gy Sta da ds ay add es

ropean En

e

rgy Sta

nda

rds may add

res

condensing Dryer pre-conditioning issue address other condensing Dryer test procdifferences between exhausted Dryers

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differences between exhausted Dryers

EERE-2007-BT-STD-0010 COMMENT 13
Other Potential Resources 

C id ? onsider

?

• European Energy Standards may ad

European Energy Standards may ad

the condensing Dryer pre-conditioni

issue and other condensing Dryer teissue and other condensing Dryer te

procedure differences between exha

Dryers

• EN 61121:2005 is the latest standar

Dryer Energy in Europe Dryer Energy in Europe

09/04/200712 of 22

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

Cd i D on

dens

ing 

Dryers

• Section 6.1 Section 6.1

“General General

” states: states:

– “ The measurements shall be carried out on a 

Dryer installed and used in accordance with t

manufacturer’s instructions, except as requirestandard”

– “ Where the tumble Dryer is intended for use 

a duct (i.e. the tumble Dryer is intended to be 

into the room) the tumble Dryer shall be testesupplied without a duct” 

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

C d i D ( i Con

dens

ing 

Dryers 

(cont

in

• Section 6 2 3 Section

6.2.3

“Resources and Ambie

Resources and Ambie

Conditions - Ambient Temperature” 

–

“The ambient temperature of the room 

The ambient temperature of the room 

vicinity of the Dryer shall be maintained 2

) °C throu

ghout the test. The measur

ambient temperature shall be recordedthis can be done by leaving the machinambient conditions for at least (12) hou

– (23) °C = (73.4) °F ± (3.6) °F 

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

C d i D ( i Con

dens

ing 

Dryers 

(cont

in

• Section 9 1 Section

9.1

“Performance Tests Performance Tests

- Ge

Ge

states:

–

“Tumble Dryers shall be configured wit

Tumble Dryers shall be configured wit

without a duct as specified in section 6

–

“ All tests shall be started with the tumb

All tests shall be started with the tumb

Dryer at ambient temperature accordin6.2.3.”

09/04/200715 of 22

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

C d i D ( i Con

dens

ing 

Dryers 

(cont

in

• Section 9.2.1 “Procedure for drying performanc

D i T t G l” t t Drying 

Tes

ts 

General” s

t

a

tes:

– “For automatic tumble Dryers, those programmes are 

which aim to achieve the final moisture values given in 

–

“Table 3: Dry cotton has a nominal final moisture conte

Table 3: Dry cotton has

a nominal final moisture conte

percent with an allowable range for final moisture contto (+3) percent.”

– “The minimum number of valid cycles shall be five. Th

result f th lid l d f f th l ti lts o

f the valid cycles are use

d

for 

further evaluatio

according to clause 10. If the Dryer is automatically stduring a cycle and the reason is that the condensation of water, the fact is reported and the test is stopped.”

– “Note: If the manufacturer gives the option to use a co

tumble Dryer both with or without condensation box, thshould be tested with the condensation box.” 

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EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

C d i D ( i Con

dens

ing 

Dryers 

(cont

in

• Section 9.2.2 “Procedure for dr

y gp in

g

performanc

Condensation Efficiency” states:

– “The condensation efficiency for a condenser tumble D

be measured using the Dry Cotton programme and se

selected to achieve the “dry cotton” result (this means equivalent timer setting for a timer Dryer) in the drying 

– “The mass of the test load is measured immediately b

after the cycle The mass of the moisture condensed after the cycle. The mass of the moisture condensed 

cycle and collected in the container is determined. Thcycle after a period of non-operation longer than (36) hnot be used for evaluation.”

– “During the time between two cycles, the door of the tu

Dryer shall be closed except for loading”

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EERE-2007-BT-STD-0010 COMMENT 13
EN 61121:2005 Related t

C d i D ( i Con

dens

ing 

Dryers 

(cont

in

• Section 10.5 “Evaluation and Calculation 

Condensation Efficiency” states:

– “Efficiency of condensation, C, is determined 

according to 9 2 2 as the ratio between the waccording to

9.2.2 as the ratio between the w

produced during the cycle Ww, relative to the mass of water evaporated from the load”

– “ C /( = Ww /( Wi 

–

Wf) is calculated 

for each cy

expressed as percentage”

– “Efficienc

y of condensation is the mean value 

minimum of four valid cycles. Note: Due to threquirement the first run of a condensation eftest has normall

y to be discarded ”

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y

EERE-2007-BT-STD-0010 COMMENT 13
Whirlpool Whirlpool s’ Condensi

Condensi

Dryer Test Procedur

Proposal to DOE

Ch t anges to

Appendix D to Subpart B of Part 

430, Title 10

Clothes Dryer Energy Standard

09/04/200719 of 22

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
Whirlpool’s Condensing Dr

P l DOE Proposa

l to DOE

• Section 1 must incorporate definitions of an exhausted Dryer, no

exhausted Dryer and a condensing Dryer exhausted Dryer, and

a condensing Dryer

– An exhausted Dryer has a blower system which is intended to deliv

moist air from the Drum cavity into a duct system external to the Dryduct system is exhausted into the outdoors.

–

A non-exhausted Dr

y 

er is intended to be used without an external d

and has no provision to connect to such a duct system. 

– A condensing Dryer is a non-exhausted tumble Dryer in which the a

the drying process is dehumidified by using room ambient air for co

blower system used for circulating room ambient air is independent 

moist air from the Drum cavity moist air from the Drum cavity.

• Paragraph 2.1 of Section 2 must be updated to include non-exha

Dryers

– Where the tumble Dryer is defined as a non-exhausted Dryer and is 

use without a duct. The tumble Dr

y p er shall be tested as supplied w

– Where the tumble Dryer is defined as an exhausted Dryer and is int

with a duct The Dryer exhaust shall be restricted by adding the AHAsimulator described in 3.3.5 of HDL-1................

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Whirlpool Corp

EERE-2007-BT-STD-0010 COMMENT 13
Whirlpool’s Condensing D

Proposal for DOE (contin

• To align with the European energy proce

To align with the European energy proce

Paragraph 2.8 of section 2 should incorpothe following condensing Dryer pre-condi

cycle

– For condensing Dryers, the Dryer steady stat

t t t b l t bi t tempera

ture mus

t

be equal to ambien

t room 

temperature according to 2.2 before the start test runs. Note: this can be done by leaving t

machine at ambient room conditions for at leahours between tests but not more than (36) hbetween tests

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Whirlpool Corp

between tests

EERE-2007-BT-STD-0010 COMMENT 13
Whirlpool’s Condensing Dr

P l DOE ( i Proposa

l to DOE

(cont

inue

• To align with the European energy procedure and for con

results (per Luise Christmann of Whirlpool Schorndorf) thresults (per Luise Christmann of Whirlpool Schorndorf), th

energy procedure should incorporate the following condentest procedure steps

– If the manufacturer gives the option to use a condensing tum

b th ith ith t d ti b th D h ll b t b

oth with or without con

densation 

box, the 

Dryer s

h

all

be tes

condensation box

– If the Dryer is automatically stopped during a cycle and the r

that the condensation box is full of water, the test is stopped

run is invalid run is invalid

– During the time between two cycles, the door of the tumble 

be closed except for loading

– The first cycle after a period of non-operation longer than (3

shall not be used for evaluation shall not be used for evaluation

– Results from the first test run on an unused (dry) condensing 

invalid and cannot be used for the energy efficiency calculat

– The Condenser unit of the Dryer must remain in place and n

out of the Dryer for any reason between tests

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out of the Dryer for any reason between tests.

EERE-2007-BT-STD-0010 COMMENT 13