Description Value Unit

Daily Ice Consumption Rate 1.8 lb/day

This spreadsheet evaluates the impact of freezer compartment temperature stability on measured energy 

use. DOE ID 1, 2, 3A, and 3B identify four tested automatic icemaker assemblies of three separate 

refrigerator-freezers. The measured annual energy use for the product was calculated from the test data 

using test periods with varying temperature stability. The plot below shows the percent impact on 

measured annual energy use as compared with the energy use measured using test periods in which freezer 

temperature is fully stable. A fully stable condition for the purposes of this assessment required that the 

freezer temperature average for individual cycles deviated from the the test period freezer temperature 

average by no more than 0.25 F (individual compressor cycles were evaluated for products with cycling 

compressors during icemaking, while icemaking cycles were evaluated for products with non-cycling 

compressors during icemaking). The analysis shows that a one percent impact on annual energy use is 

exceeded for freezer temperature instability exceeding roughly 3  ̊F.

0.00%

0.25%

0.50%

0.75%

1.00%

1.25%

1.50%

1.75%

0.0 2.0 4.0 6.0 8.0 10.0 12.0

Percent Im

p

act O

n

E

nerg

y

Freezer Temperature Deviation (°F)

Energy Impact of Freezer Temperature Deviation 

from Stable Test Period Temperature

DOE ID #1 DOE ID#2 DOE ID #3A DOE ID #3B
Baseline Average 

Power, PI1 (Watts)

Ice Mass per 

Icemaker Cycle, 

MICE_CYC (pounds)

Annual Energy Use not 

Including the Energy 

Use Associated with 

Icemaking (kWh/year)

65.30 0.19 598.79

Icemaking Test Data and Calculations for Individual Cycles

Cycle Number

Average Fresh 

Food 

Compartment 

Temperature (°F)

Average Freezer 

Compartment 

Temperature (°F)

Average 

Power, PI2 

(Watts)

Duration 

(minutes)

1 39.57 2.48 99.40 67

2 39.30 0.57 89.09 66

3 39.31 0.32 87.27 66

4 39.32 0.23 87.69 65

5 39.36 0.21 86.77 65

6 39.35 0.28 87.69 65

7 39.27 0.24 87.27 66

8 39.31 0.18 87.16 64

9 39.27 0.23 87.69 65

10 39.27 0.21 88.18 66

Test Period Average Freezer Tempera

Maximum Freezer Temperature Differ

Number of Icemaker Cy

Icemaking Test Average Power, PI2 

Icemaking Test Period, TI2 (m

Energy Use Per Ice Mass, EIM (

Annual Icemaking Energy, 365*IET (

Annual Energy Use, 365*E (

Icemaking Energy Percent Difference versus Stabilized Tes

Annual Energy Use Percent Difference versus Stabilized Tes
Calculations for Test Periods Comprising Groups of Icemaking Cycles

Stabilized Test Period

Icemaking Cycles 1 

through 10

Icemaking Cycles 2 

through 10

Icemaking Cycles 3 

through 10

Energy (kWh)

Energy Use 

Per Ice Mass, 

EIM (kWh/lb)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

0.111 0.20 1.98 - -

0.098 0.14 0.07 0.30 -

0.096 0.13 0.18 0.04 0.08

0.095 0.13 0.27 0.05 0.01

0.094 0.12 0.29 0.07 0.03

0.095 0.13 0.22 0.00 0.04

0.096 0.13 0.26 0.03 0.00

0.093 0.12 0.32 0.09 0.05

0.095 0.13 0.27 0.04 0.01

0.097 0.13 0.29 0.07 0.03

t Period Average Freezer Temperature ( ̊F) 0.50 0.27 0.24

mum Freezer Temperature Difference ( ̊F) 1.98 0.30 0.08

Number of Icemaker Cycles, Ncyc 10 9 8

cemaking Test Average Power, PI2 (Watts) 88.85 87.65 87.47

Icemaking Test Period, TI2 (minutes) 655 588 522

Energy Use Per Ice Mass, EIM (kWh/lb) 0.135 0.128 0.127

nual Icemaking Energy, 365*IET (kWh/yr) 88.9 84.2 83.4

Annual Energy Use, 365*E (kWh/yr) 687.7 683.0 682.2

t Difference versus Stabilized Test Period 6.6% 0.9% -

t Difference versus Stabilized Test Period 0.8% 0.1% -
Baseline 

Average 

Power, PI1 

(Watts)

Ice Mass per 

Icemaker Cycle, 

MICE_CYC (pounds)

Annual Energy Use not 

Including the Energy 

Use Associated with 

Icemaking (kWh/year)

59.77 0.26 617

Data and Calculations for Individual Cycles

Whole Icemaking Cycle Based Values

Cycle Number

Average Power, PI2 

(Watts)

Duration (minutes)

Test Period 

Energy, EPI2 

(kWh)

Average Fresh 

Food 

Compartment 

Temperature 

(°F)

1 88.35 71.98 0.106 37.82

2 88.55 70.47 0.104 37.42

3 88.42 71.93 0.106 37.28

4 89.21 71.97 0.107 37.20

5 88.69 72.38 0.107 37.15

6 89.40 72.48 0.108 37.07

7 89.34 72.53 0.108 37.00

8 89.92 72.73 0.109 36.93
Calculations for Test Periods Comprising Groups 

Whole Compressor Cycle Based Values

Icemaking Cycles 1 

through 8

Average 

Freezer 

Compartment 

Temperature 

(°F)

Average 

Power, PI3 

(Watts)

Duration 

(minutes)

Energy, EPI3 

(kWh)

Energy Use 

Per Ice Mass, 

EIM 

(kWh/lb)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

0.63 89.14 70.00 0.104 0.132 0.59

1.04 90.26 68.47 0.103 0.133 0.18

1.21 89.70 68.90 0.103 0.134 0.01

1.30 88.45 69.87 0.103 0.132 0.08

1.39 88.31 69.30 0.102 0.131 0.16

1.37 88.64 70.40 0.104 0.133 0.15

1.40 88.68 70.37 0.104 0.134 0.18

1.45 89.21 70.62 0.105 0.136 0.22

Test Period Average Freezer Temperature ( ̊F) 1.22

Maximum Freezer Temperature Difference ( ̊F) 0.59

Number of Icemaker Cycles, Ncyc 8

Compressor-Cycle-Based Test Period Average Power, PI3 (Watts) 89.05

Icemaker-Based Test Period Energy Use, EPI2 (kWh) 0.86

Energy Use Per Ice Mass, EIM (kWh/lb) 0.133

Annual Icemaking Energy, 365*IET (kWh/yr) 87.6

Annual Energy Use, 365*E (kWh/yr) 704.4

Icemaking Energy Percent Difference versus Stabilized Test Period 0.1%

Annual Energy Use Percent Difference versus Stabilized Test Period 0.0%
ns for Test Periods Comprising Groups of Icemaking Cycles

Stabilized Test Period

Icemaking Cycles 2 

through 8

Icemaking Cycles 3 

through 8

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

- -

0.27 -

0.10 0.14

0.01 0.05

0.08 0.03

0.06 0.02

0.09 0.05

0.14 0.09

1.31 1.35

0.27 0.14

7 6

89.03 88.83

0.75 0.65

0.133 0.133

87.6 87.6

704.5 704.5

0.0% -

0.0% -
Baseline Average 

Power, PI1 

(Watts)

Ice Mass per 

Icemaker Cycle, 

MICE_CYC (pounds)

Annual Energy Use 

not Including the 

Energy Use Associated 

with Icemaking 

(kWh/year)

66.68 0.24 599.59

Icemaking Test Data and Calculations for Individual Cycles

Cycle Number

Average Fresh 

Food 

Compartment 

Temperature (°F)

Average Freezer 

Compartment 

Temperature (°F)

Average 

Power, PI2 

(Watts)

Duration 

(minutes)

Energy (kWh)

1 40.67 -5.66 105.85 106.00 0.187

2 40.13 -12.57 101.14 70.00 0.118

3 40.01 -13.45 100.00 72.00 0.120

4 40.03 -13.83 100.54 74.00 0.124

5 40.05 -14.03 100.00 72.00 0.120

6 40.08 -14.08 99.40 70.02 0.116

7 40.11 -13.93 98.33 72.00 0.118

8 40.12 -13.90 100.54 74.00 0.124

9 40.14 -13.93 100.27 73.00 0.122

10 40.17 -13.98 99.45 73.00 0.121

11 40.14 -13.99 100.80 75.00 0.126

12 40.22 -14.09 100.00 75.00 0.125

Test Period Average Freezer Temperature (

Maximum Freezer Temperature Difference (

Number of Icemaker Cycles, N

Icemaking Test Average Power, PI2 (Wat

Icemaking Test Period, TI2 (minute

Energy Use Per Ice Mass, EIM (kWh/l

Annual Icemaking Energy, 365*IET (kWh/y

Annual Energy Use, 365*E (kWh/y

Icemaking Energy Percent Difference versus Stabilized Test Peri

Annual Energy Use Percent Difference versus Stabilized Test Peri
Calculations for Test Periods Comprising Groups of Icemaking Cycles

Icemaking Cycles 1 

through 12

Icemaking Cycles 2 

through 12

Icemaking Cycles 3 

through 12

Icemaking Cycles 4 

through 12

Energy Use 

Per Ice Mass, 

EIM (kWh/lb)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

0.28 7.19 - - -

0.17 0.28 1.24 - -

0.16 0.60 0.35 0.47 -

0.17 0.98 0.02 0.10 0.02

0.16 1.18 0.22 0.11 0.22

0.16 1.23 0.27 0.16 0.27

0.16 1.08 0.12 0.01 0.12

0.17 1.05 0.10 0.02 0.10

0.17 1.08 0.13 0.01 0.13

0.16 1.13 0.18 0.06 0.18

0.18 1.14 0.19 0.07 0.19

0.17 1.24 0.29 0.17 0.29

e Freezer Temperature ( ̊F) -12.85 -13.80 -13.92 -13.80

emperature Difference ( ̊F) 7.19 1.24 0.47 0.29

er of Icemaker Cycles, Ncyc 12 11 10 9

Average Power, PI2 (Watts) 100.73 100.05 99.94 99.94

Test Period, TI2 (minutes) 906 800 730 658

er Ice Mass, EIM (kWh/lb) 0.176 0.166 0.166 0.166

 Energy, 365*IET (kWh/yr) 115.6 109.1 109.2 109.3

nergy Use, 365*E (kWh/yr) 715.2 708.7 708.8 708.9

sus Stabilized Test Period 5.9% 0.0% 0.0% 0.2%

sus Stabilized Test Period 0.9% 0.0% 0.0% 0.0%
Stabilized Test Period

Icemaking Cycles 5 

through 12

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period (°F)

-

-

-

-

0.11

0.16

0.01

0.02

0.01

0.06

0.07

0.17

-13.92

0.17

8

99.94

584

0.166

109.2

708.7

-

-
Baseline 

Average Power, 

PI1 (Watts)

Ice Mass per 

Icemaker 

Cycle, MICE_CYC 

(pounds)

Annual Energy Use not 

Including the Energy Use 

Associated with 

Icemaking (kWh/year)

68.35 0.28 600

Icemaking Test Data and Calculations for Individual Cycles

Cycle Number

Average Fresh 

Food 

Compartment 

Temperature 

(°F)

Average Freezer 

Compartment 

Temperature (°F)

Average 

Power, PI2 

(Watts)

Duration 

(minutes)

Energy (kWh)

1 41.16 0.50 124.26 84.02 0.17

2 40.24 -7.92 116.05 76.00 0.15

3 39.97 -10.78 113.33 72.00 0.14

4 39.80 -11.83 113.24 71.00 0.13

5 39.73 -12.26 112.29 70.00 0.13

6 39.73 -12.47 112.17 69.00 0.13

7 39.71 -12.56 113.91 69.00 0.13

8 39.74 -12.60 113.04 69.00 0.13

Test Period Average Freezer Temperature 

Maximum Freezer Temperature Difference 

Number of Icemaker Cycles, 

Icemaking Test Average Power, PI2 (W

Icemaking Test Period, TI2 (minu

Energy Use Per Ice Mass, EIM (kWh

Annual Icemaking Energy, 365*IET (kWh

Annual Energy Use, 365*E (kWh

Icemaking Energy Percent Difference versus Stabilized Test Pe

Annual Energy Use Percent Difference versus Stabilized Test Pe
Calculations for Test Periods Comprising Groups of Icemaking Cycles

Icemaking Cycles 1 

through 8

Icemaking Cycles 2 

through 8

Icemaking Cycles 3 

through 8

Icemaking Cycles 4 

through 8

Energy Use Per 

Ice Mass, EIM 

(kWh/lb)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

0.28 10.21 - - -

0.22 1.79 3.51 - -

0.19 1.07 0.66 1.30 -

0.19 2.13 0.40 0.24 0.51

0.18 2.56 0.83 0.19 0.08

0.18 2.76 1.03 0.39 0.12

0.19 2.85 1.12 0.49 0.22

0.18 2.89 1.16 0.53 0.26

ge Freezer Temperature ( ̊F) -9.71 -11.44 -12.07 -12.34

Temperature Difference ( ̊F) 10.21 3.51 1.30 0.51

ber of Icemaker Cycles, Ncyc 8 7 6 5

Average Power, PI2 (Watts) 115.03 113.47 113.00 112.93

g Test Period, TI2 (minutes) 580 496 420 348

Per Ice Mass, EIM (kWh/lb) 0.202 0.191 0.187 0.185

g Energy, 365*IET (kWh/yr) 132.9 125.5 122.7 121.8

Energy Use, 365*E (kWh/yr) 732.4 725.1 722.3 721.4

rsus Stabilized Test Period 9.8% 3.7% 1.4% 0.7%

rsus Stabilized Test Period 1.6% 0.6% 0.2% 0.1%
Stabilized Test Period

Icemaking Cycles 5 

through 8

Freezer Temperature 

Difference, SingleIcemaking-Cycle 

versus Test Period 

(°F)

-

-

-

-

0.21

0.01

0.09

0.13

-12.47

0.21

4

112.85

277

0.184

121.0

720.6

-

-