AHAM Update to DOE on Status of IceMaker Energy Test ProcedureNovember 19, 2009IntroductionMay 2009 - AHAM members agree to develop an icemaker energy test procedureJune 2009–Discussion with DOE on feasibility ofincluding ice maker energy in 2014 test procedureJuly 2009HRF1 task force meeting to developJuly2009–-1taskforcemeetingtodeveloppreliminary test procedure (included non-manufacturerstakeholders)August/September 2009 – Initial testing to preliminarytest procedure2Overview of ProcedureAllow ice maker to fill – deactivate harvestSet unit at mid/mid controls settingRun unit until stability is achievedCalculate EP1, T1Allow ice maker to start making iceCollect many hours of data to be evaluatedTime 0 will be at the start of a compressor cycleDetermine where temperature data stabilizesDetermine EP3, T33Determination of Ice Maker EnergyIET = IEP/W x FactorIET = Test cycle energy expended to produce ice in kWh/dayIEP = Energy expended in kWh to produce ice during the testperiodW = Weight in pounds of ice produced and harvestedFactor = Daily ice production factor corresponding to theaverage daily amount of ice produced during normalhousehold use under typical conditionsIEP is normalized to energy per expended per poundof ice4Ice Use FactorData from 3 consumer surveys & 3 fieldtestsDetermined average weighted lb/day afterremoving highest and lowest valueFactor = 1.8 lb/dayTotal sample size = 1555Preliminary Testing51 units tested7 manufacturers7 product classesAverage ice maker energy use = 83 kWh/yearStandard deviation = 28 kWh/year(COV =(34%)Note: Thermodynamic energy required to convert90°F water to 0°F ice is approximately 39 kWh/year6ConcernsVariabilityControl technology (i.e., electronic or standard control)impacts energy useimpactsenergyuseLocation of the ice storage bin impacts energy useCalculated energy is dependent on whichcompressor/ice maker cycles are used to calculateEP3Variation from Manufacturer to Manufacturer(productdesign)Several units did not achieve stability during the testTi i t i t tTimeintensivetest7Next StepsCompare actual tests performed by eachmanufacturer versus the written procedure –end NovemberDetermine language to provide clarification tothe test proced reend Decemberthetestprocedure–endDecemberAdditional testing of units – end FebruaryRound robin testing of one or two unitsendRoundrobintestingofoneortwounits–April8DefinitionsEP1 (10 CFR 430 B, A1) – Energy expendedin kWh during the first part of the testT1 (10 CRF 430 B A1) – length of time, inminutes, of the first part of the testEP3 (new)–Energy expended in kWh duringthe test when the ice maker making andharvesting iceharvestingiceT3 (new) – length of time, in minutes, when icemaker is makingand harvestingiceg9Bin Frequency20 030 040 050 660 1070 580 390 5100 7110 4120 5130 3140 2150 1160 04681012

FrequencyPass1‐DistributionofIceMakerEnergyUseFrequency170 0180 0190 0200 0More00220 30 40 50 60 70 80 90 100 110 120 130 140 150 160Energyuse(kWh/year)AggregationofPass1IceMakerEnergyData‐UpdatedOctober28,2009ByDOEProductClassDataDOEProductClass CountofIET(kWh/day) AverageofIET(kWh/day) AverageofIET(kWh/year) StdDevofIET(kWh/year)COV370.217739.752%5110.228221.827%7150.217527.437%19130.269625.626%ByControl‐Type(Electronicvs.Standard)DataControl‐type CountofIET(kWh/day) AverageofIET(kWh/day) AverageofIET(kWh/year) StdDevofIET(kWh/year)COVElectronic360.238525.029%Standard150.228035.644%ByLocationofIceStorage(FreezerorFreshFood)DataIcestorageCountofIET(kWh/day)AverageofIET(kWh/day) AverageofIET(kWh/year) StdDevofIET(kWh/year)COVFreezer380.227928.035%FreshFood130.269625.626%OverallCountAverageofIET(kWh/day) AverageofIET(kWh/year) StdDevofIET(kWh/year)COV510.238328.234%Severalunitsdidnotachievestabilityduringthetest.Timetoreachstability(forthoseproductsthatwereableto)rangedfrom1‐2hoursto16hours.kWh/lbvaires,dependingonwhetherharvestoccdursduringon‐cycleoroff‐cycle.

## DRAFT

5/18/09

Proposal for consideration by AHAM Refr igerator-Freezer DOE Task Force Re Ice

Production Energy Consumption Measurement

Page 1 of 2 PROPOSED NEW SECTION 5.8.2.2.

5.8.2.2.1 5.8.2.2. Ice Production Energy Consumption . The energy consumption

used to freeze and harvest ice (col lectively referred to as “produce”,

“producing” or “production” of ice) shall be determined by the test

method set forth in this section. For refrigerator-freezers and freezers

equipped with automatic icemakers, the energy determined under this

section shall be added to the per-da y energy consumption as specified in

section 5.8.2.1 such that the combined per-day energy consumption shall

represent the energy consumed by th e test unit under typical room

conditions with the automatic icem aker operational and producing a

normal quantity of ice for an adjusted 24-hour period of operation. This

section shall be used to determine the per-day ice production energy for all

refrigerators, refrigerator-freezers and freezers which are intended for use

with an icemaker, including all units sold to consumers with an installed

icemaker or designed to accept an instal lation of an automatic icemaker in

the field.

5.8.2.2.1 5.8.2.2.2 With the temperature controls se t at the settings provided under

section 5.6.2.1.1 , measure the energy consumption of the test unit during

the test period as specified in sec tion 5.7 with the automatic icemaker

operative and producing ice. Inlet wate r temperature to the icemaker shall

be controlled to 60 ◦ 

## F during the energy testi ng. If consumer activated

controls are provided for manually ad justing the ice production rate, the

energy test shall be performed with the controls set at the fastest ice

production such that the automatic icemak er produces ice at its fastest rate,

consistent with section 5.5.2.f . If consumer activated controls are

provided for manually increasing the i ce production rate above the normal

rate and automatically returning the i ce production rate to the normal rate,

the energy test shall be performed with the controls set at the normal ice

production. If no consumer activated controls are provi ded, ice production

rates shall not be modified during the energy test from the normal ice

production rates during normal consumer use.

5.8.2.2.2 5.8.2.2.3 Determine the energy consumption used to produce ice by

subtracting the energy consum ption measured under section 5.6.2.1 .1

during the test period as specified in section 5.7 with the icemaker in a

normally powered-on condition but prev ented from making or harvesting

ice by a sensed ice bin-full condition. inoperative but disabled due to an

## DRAFT

5/18/09

Proposal for consideration by AHAM Refr igerator-Freezer DOE Task Force Re Ice

Production Energy Consumption Measurement

Page 2 of 2 ice

- bin

- full condition from the energy me asured under 5.8.2.2.1

. This

difference is the ice production ener gy expended in kWh during the test

period (IEP).

5.8.2.2.3 5.8.2.2.4 Weigh the ice produced into the ice storage bucket during the test

period as provided under section 5.8.2.2.1 . Weight (W) shall be measured

in lbs (g)

.

5.8.2.2.4 5.8.2.2.5 Calculate Per-Day Ice Production Energy . The energy

consumption in kWh/day for ice produc tion shall be calculated as follows:

IET = IEP/W × Factor

where

IET = Test cycle energy expe nded to produce ice in kWh/day

IEP = Energy expended in kWh to produce ice during the test period, as

determined under section 5.8.2.2.2.

W = Weight in lbs of the ice produced and harvested into the ice

storage bucket during the test period as provided under section

5.8.2.2.1.

Factor = Daily ice production factor corresponding to the average daily

amount of ice produced during normal household use under

typical conditions (TBD).

5.8.2.2.5 This section 5.8.2.2. shall be us ed to determine the per

- day ice production

energy for all refrigerators, re frigerator

- freezers and freezers which are

intended for use with an icemaker, in cluding all units so ld to consumers

with an installed icemaker or desi gned to accept an installation of an

automatic icemaker in the field.Comments/Observations/Questions from the R

‐ F Summit in May and Further Discussions on

Ice making Energy Testing for HRF

‐ 1 task Force Meeting

– July 14, 2009

1. Need to define normal quantity of ice

To be discussed during July 16 meeting.

2. Inlet water temperature of 60 ° F is no t realistic

– should be the same as test ambient

(90 ° F +/

‐ 1° F)

Seems like water temperature should be the same as the test cell temperature. Any

other temperature would pose an added complexity to the test.

Final proposal on water temperature: 90 degrees F for water temp +/

‐ 3 degrees F.

Final proposal on water pressure: 60 +/

‐ 30 psig.

3. Should be ice bin, not ice bucket

Suggest “ice storage bin.” In the definitions, 3.7 uses “storage bin.”

Need to specify somewhere in standard that the test must be on the ice maker/bin

shipped with the product. Section 5.5.2 in HRF

‐ 1

‐ 2008 covers set

‐ up.

4. Weight should be specified to nearest 0.01 lb

This is the tolerance specified in 5.4.5. Also include metric equivalents (4.5 g) to weight

and all other measurements.

Open item. Look at magnitude of values and additional data. Keep rounding to metric

consistent with policies and procdures.

5. Develop definitions of inoperative and disabled

This has to be consistent with 5.5.2.c) and 5.8.2.2.2. Suggest “inoperative but ON or

energized” may be clearer and better language.

See comments in 5.8.2.2.2

6. Need to clarify when start making ice

– ideally when start defrost. How will ice maker

be initiated without opening the door?

This needs some careful attention to make sure we aren’t missing anything when the

various types of units, controls, and defrost systems are factored in. Seems to ma kes

sense to start the ice making energy test at the same time in the cycle that the

traditional energy test is initiated and to have the same duration (say for the standard

or long term defrost tests but not the variable test segment). Since the unit has to be

stabilized before the tes t, that would preclude opening the door to turn on the

icemaker. Perhaps units can be modified to allow energizing the icemaker without

opening doors? Also, is the storage bin large enough to accommodate all the ice

produced during the test without the icemaker shutting off? Should any ice be in the

bi n when the test starts (see comment below also)?• Run standard energy test at mid

‐ mid and cold/cold or warm/warm to bracket

39/0 degrees F (T1, EP1).

• Run ice maker energy test at mid

‐ mid and cold/cold or warm/warm to bracket

39/0 at stable run conditions.

• Show cabinet stable (T1, EP1

– already done) with ice maker off

• How turn on ice maker? Turn on ice maker (open door and turn on

– switch/bale/other)

– immediately go into harvest cycle. Start measurement to

coincide with a compressor on (remove any energy data before first compressor

on).

• Monitor energy over 3 hours, 6 hours, 9 hours,... 15 hours (if possible) to

understand time necessary for decreasing test variability.

• Compare T1 and T3 (x% difference) in both compartments. If too high, may

need to adjust. If can’t meet criteria

– how deal with? Handled in the past by

saying coldest is the test point. Monitor during this draft phase.

• Weigh amount of ice at end of test.

• Compare differential energy consumption between EP1 and EP3.

• Interpolate to 39/0 with non

‐ IM portion, then add [interpolated to 39/0] IM

part at mid

‐ mid.

• For traditional product (mechanical)

– how deal with defrost? Run defrost to

defrost? Harvest with defrost? Defrost would need to be in baseline, and then it

would be substracted out.

o Assumption 1: water present in ice maker does not affect defrost time

o Assumption 2: removing defrost cycle and harvest after defrost will

have some impact on energy per lb (?)

– but necessary to simplify

approach.

• Specify that W is dependent on the number of cycles included in T3, EP3 test (do

not include cycles prior to first compressor start). Test period

– energy

measurements

– not entire period.

7. What do if product shipped with no ice maker

– this could be a loophole. What energy

is tested/reported? This topic needs more discussion.

It seems like Whirlpool’s 5.8.2.2.5 covers this. If the unit is designed to accept an

icemaker at any point, it has to be tested with it

.

Consumer

– compare at time of purchase

– want to compare unit

‐ to

‐ unit.

Not dealing with how energy added to standard. Issue is how should units be tested to

get ice maker energy number.

Report two numbers? Without and with an icemaker? Reporting could be an issue.

DOE/FTC needs to deal with.

8. Should crushing/dispensing energy be included? The task force decided that this

energy is relatively small compared to that of making ice and will not be included

Suggest postponing this consideration for another rulemaking

This will not be addressed. Too much variation. Formatted: Bulleted + Level: 1 + Aligned at:

4.5 pi + Indent at: 6 pi

Formatted: Font: Bold

Formatted: Bulleted + Level: 1 + Aligned at:

4.5 pi + Indent at: 6 pi

Formatted: Indent: Left: 6 pi

Formatted: Bulleted + Level: 1 + Aligned at:

4.5 pi + Indent at: 6 pi

Formatted: Bulleted + Level: 2 + Aligned at:

7.5 pi + Indent at: 9 pi

Formatted: Bulleted + Level: 1 + Aligned at:

4.5 pi + Indent at: 6 pi

Formatted: Indent: Left: 0 pi9. Ice Storage Bin condition

Whirlpool suggests that the portion of the energy test that does not measure ice making

energy be conducted “with the ice bin filled with ice to trigger a sensed ice

‐ bin

‐ full

condition or with a simulated ice load designed to trigger the ice

‐ bin

‐ fu ll condition and

produce identical results to testing with actual ice.” Thermodynamically, a full ice bin

provides an additional small thermal load that could impact performance (cycling, etc.)

Also, units have various bin capacities resulting different ice thermal loads.

Will be discussed at another session.

10. How to “produce identical results” is somewhat ambiguous and needs further

definition.

10. Will be discussed at another session.

11. Comparison of AHAM test to others

Lindsey Roke: I see some likelihood of a test that measures the energy to actually make

ice rather than just storing it getting into the new IEC standard at some stage. The ideal

situation would be to pick up an existing ice production en ergy

‐ test standard from

somewhere around the world and use it exactly as it is. To the best of my knowledge,

nobody else has yet produced in ice making energy test procedure so this version that

AHAM is developing must be considered a front runner. In that event it will need to be

a me tricated. So it would be good if either the numbers are round numbers in metric

units or there is a wide enough tolerance on them that they can be rounded numbers in

metric units. (So far you have not specified tolerances.). I assume that asking it to be

writ ten straight in metric units would be asking too much.

Japan has a type of test

– IM is manually filled with water. Very different from U.S. This

would be the first automatic IM energy test procedure.

12. Consider the impact of different platforms on the energy consumed to make a

specified quantity of ice.

Determined by testing.

13. What tolerance will the test have? How will adding the ice maker energy test affect

the tolerance of the overall energy test?

13. 14. Determined by testing

15. The test procedure needs to clarify temperature and operational settings for all

compartments and components.

See number 6 above.

14. Operational settings are proposed in 5.8.2.2.1. Formatted: Indent: Left: 3 pi, No bullets or

numbering

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numbering

Formatted: Indent: Left: 0 pi