**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**P e** **r c** **e n** **t I** **m p** **a c** **t O** **n E** **n e** **r g** **y**



### Freezer Temperature**Deviation ( °** **F)** 

## Energy Impact of Freezer**Te mperature Deviation**  **from Stable T**

**est Period T**

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

**Power, PI1 (Watts) Ice Mass per** 

**Icemaker Cycle, M** **ICE_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 Temperature ( Maximum Freezer Temperature Difference (** 

**Number of Icemaker Cycles, N Icemaking Test Average Power, PI2 (Watts)**  **Icemaking Test Period, TI2 (minutes) Energy Use Per Ice Mass, EIM (kWh/lb)**  **Annual Icemaking Energy, 365*IET (kWh/yr)**

**Annual Energy Use, 365*E (kWh/yr)** **Icemaking Energy Percent Difference versus Stabilized Test Period Annual Energy Use Percent Difference versus Stabilized Test Period** **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, Single Icemaking-Cycle**  **versus Test Period (°F) Freezer Temperature** **Difference, Single Icemaking-Cycle**  **versus Test Period (°F) Freezer Temperature** **Difference, Single Icemaking-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 **Test Period Average Freezer Temperature (  ̊** **F)** 

### 0.50 0.27 0.24 **Maximum Freezer Temperature Difference (  ̊** **F)** 

### 1.98 0.30 0.08

**Number of Icemaker Cycles, N cyc**  

### 10 9 8 **Icemaking 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 **Annual 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 **Icemaking Energy Percent Difference versus Stabilized Test Period** 

### 6.6% 0.9%

- **Annual Energy Use Percent Difference versus Stabilized Test Period** 

### 0.8% 0.1%

-**Baseline**

**Average Power, PI1**  **(Watts) Ice Mass per** 

**Icemaker Cycle, M** **ICE_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 of Icemaking Cycles**

**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, Single Icemaking-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, N cyc**  

### 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%**Calculations for Test Periods Comprising Groups of Icemaking Cycles Stabilized Test Period**  **Icemaking Cycles 2 through 8**  **Icemaking Cycles 3**

**through 8 Freezer Temperature** **Difference, Single Icemaking-Cycle**  **versus Test Period (°F)**  **Freezer Temperature**

**Difference, Single Icemaking-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, M** **ICE_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 (Watts)**  **Icemaking Test Period, TI2 (minutes) Energy Use Per Ice Mass, EIM (kWh/lb)**  **Annual Icemaking Energy, 365*IET (kWh/yr)**

**Annual Energy Use, 365*E (kWh/yr)** **Icemaking Energy Percent Difference versus Stabilized Test Period Annual Energy Use Percent Difference versus Stabilized Test Period** **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, Single Icemaking-Cycle**  **versus Test Period (°F) Freezer Temperature** **Difference, Single Icemaking-Cycle**  **versus Test Period (°F) Freezer Temperature** **Difference, Single Icemaking-Cycle**  **versus Test Period (°F) Freezer Temperature** **Difference, Single Icemaking-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 **Test Period Average Freezer Temperature (  ̊** **F)** 

### -12.85 -13.80 -13.92 -13.80 **Maximum Freezer Temperature Difference (  ̊** **F)** 

### 7.19 1.24 0.47 0.29

**Number of Icemaker Cycles, N cyc**  

### 12 11 10 9 **Icemaking Test Average Power, PI2 (Watts)** 

### 100.73 100.05 99.94 99.94 **Icemaking Test Period, TI2 (minutes)** 

### 906 800 730 658 **Energy Use Per Ice Mass, EIM (kWh/lb)** 

### 0.176 0.166 0.166 0.166 **Annual Icemaking Energy, 365*IET (kWh/yr)** 

### 115.6 109.1 109.2 109.3

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

### 715.2 708.7 708.8 708.9 **Icemaking Energy Percent Difference versus Stabilized Test Period** 

### 5.9% 0.0% 0.0% 0.2% **Annual Energy Use Percent Difference versus Stabilized Test Period** 

### 0.9% 0.0% 0.0% 0.0%**Stabilized Test Period**

**Icemaking Cycles 5 through 12**  **Freezer Temperature Difference, Single**  **Icemaking-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, M** **ICE_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, N Icemaking Test Average Power, PI2 (Watts)**  **Icemaking Test Period, TI2 (minutes) Energy Use Per Ice Mass, EIM (kWh/lb)**  **Annual Icemaking Energy, 365*IET (kWh/yr)**

**Annual Energy Use, 365*E (kWh/yr)** **Icemaking Energy Percent Difference versus Stabilized Test Period Annual Energy Use Percent Difference versus Stabilized Test Period** **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, Single Icemaking-Cycle**  **versus Test Period (°F)**  **Freezer Temperature**

**Difference, Single Icemaking-Cycle**  **versus Test Period (°F)**  **Freezer Temperature**

**Difference, Single Icemaking-Cycle**  **versus Test Period (°F)**  **Freezer Temperature**

**Difference, Single Icemaking-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 **Test Period Average Freezer Temperature (  ̊** **F)** 

### -9.71 -11.44 -12.07 -12.34 **Maximum Freezer Temperature Difference (  ̊** **F)** 

### 10.21 3.51 1.30 0.51

**Number of Icemaker Cycles, N cyc**  

### 8 7 6 5 **Icemaking Test Average Power, PI2 (Watts)** 

### 115.03 113.47 113.00 112.93 **Icemaking Test Period, TI2 (minutes)** 

### 580 496 420 348 **Energy Use Per Ice Mass, EIM (kWh/lb)** 

### 0.202 0.191 0.187 0.185 **Annual Icemaking Energy, 365*IET (kWh/yr)** 

### 132.9 125.5 122.7 121.8

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

### 732.4 725.1 722.3 721.4 **Icemaking Energy Percent Difference versus Stabilized Test Period** 

### 9.8% 3.7% 1.4% 0.7% **Annual Energy Use Percent Difference versus Stabilized Test Period** 

### 1.6% 0.6% 0.2% 0.1%**Stabilized Test Period**

**Icemaking Cycles 5 through 8**  **Freezer Temperature Difference, Single**  **Icemaking-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

-

-