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Implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for household refrigerating appliances (Text with EEA relevance)

# ANNEX IV — Method for calculating the Energy Efficiency Index

### 1.CLASSIFICATION OF HOUSEHOLD REFRIGERATING APPLIANCES

Household refrigerating appliances are classified in categories as in Table 1. Each category is defined by the specific compartment composition as specified in Table 2 and is independent of the number of doors and/or drawers.

Table 1

### Household refrigerating appliances categories

CategoryDesignation
1Refrigerator with one or more fresh-food storage compartments
2Refrigerator-cellar, cellar and wine storage appliances
3Refrigerator-chiller and refrigerator with a 0-star compartment
4Refrigerator with a 1-star compartment
5Refrigerator with a 2-star compartment
6Refrigerator with a 3-star compartment
7Refrigerator-freezer
8Upright freezer
9Chest freezer
10Multi-use and other refrigerating appliances

Household refrigerating appliances that cannot be classified in categories 1 to 9 because of compartment temperature are classified in Category 10.

Table 2

### Household refrigerating appliance classification and relevant compartment composition

Nominal temperature (for the EEI) (°C)Design T+ 12+ 12+ 5006121818

Category

(number)

Compartment typesOtherWine storageCellarFresh food storageChill0-star/Ice making1-star2-star3-star4-star
Appliance CategoryCompartments composition
REFRIGERATOR WITH ONE OR MORE FRESH-FOOD STORAGE COMPARTMENTSNNNYNNNNNN1
REFRIGERATOR-CELLAR, CELLAR AND WINE STORAGE APPLIANCEOOOYNNNNNN2
OOYNNNNNNN
NYNNNNNNNN
REFRIGERATOR-CHILLER AND REFRIGERATOR WITH A 0-STAR COMPARTMENTOOOYYONNNN3
OOOYOYNNNN
REFRIGERATOR WITH A 1-STAR COMPARTMENTOOOYOOYNNN4
REFRIGERATOR WITH A 2-STAR COMPARTMENTOOOYOOOYNN5
REFRIGERATOR WITH A 3-STAR COMPARTMENTOOOYOOOOYN6
REFRIGERATOR-FREEZEROOOYOOOOOY7
UPRIGHT FREEZERNNNNNNNOY(1)Y8
CHEST FREEZERNNNNNNNONY9
MULTI-USE AND OTHER APPLIANCESOOOOOOOOOO10

Household refrigerating appliances are classified in one or more climate classes as shown in Table 3

Table 3

### Climate classes

ClassSymbolAmbient average temperature °C
Extended temperateSN+ 10 to + 32
TemperateN+ 16 to + 32
SubtropicalST+ 16 to + 38
TropicalT+ 16 to + 43

The refrigerating appliance shall be capable of maintaining the required storage temperatures in the different compartments simultaneously and within the permitted temperature deviations (during the defrost cycle) as defined in Table 4 for the different types of household refrigerating appliances and for the appropriate climate classes.

Multi-use appliances and/or compartments shall be capable of maintaining the required storage temperatures of the different compartment types where these temperatures can be set by the end-user according to the manufacturer’s instructions.

Table 4

### Storage temperatures

Storage temperatures (°C)
Other compartmentWine storage compartmentCellar compartmentFresh-food storage compartmentChill compartmentOne-star compartmentTwo-star compartment/sectionFood freezer and three-star compartment/cabinet
tomtwmatcmt1m, t2m, t3m, tmatcct*t**t***
> + 14+ 5 ≤ twma ≤ + 20+ 8 ≤ tcm ≤ + 140 ≤ t1m, t2m, t3m ≤ + 8; tma ≤ + 4– 2 ≤ tcc ≤ + 3≤ – 6≤ – 12(2)≤ – 18(3)

### 2.CALCULATION OF THE EQUIVALENT VOLUME

The equivalent volume of a household refrigerating appliance is the sum of the equivalent volumes of all compartments. It is calculated in litres and rounded to the nearest integer as:

$${V _{eq}} = {\left [\sum V _{c} \times {\frac{25 - T _{c}}{20}} \times \mathrm{FF} _{c}\right ] \times \mathrm{CC} \times \mathrm{BI}}$$

where:

• n is the number of compartments
• Vc is the storage volume of the compartment(s)
• Tc is the nominal temperature of the compartment(s) as set out in Table 2
• $${\frac{25 - T _{c}}{20}}$$ is the thermodynamic factor as set in Table 5
• FFc, CC and BI are volume correction factors as set out in Table 6.

The thermodynamic correction factor $${\frac{25 - T _{c}}{20}}$$ is the temperature difference between the nominal temperature of a compartment Tc (defined in Table 2) and the ambient temperature under standard test conditions at + 25 °C, expressed as a ratio of the same difference for a fresh-food compartment at + 5 °C.

The thermodynamic factors for the compartments described in Annex I, points (i) to (p), are set out in Table 5.

Table 5

### Thermodynamic factors for refrigerating appliance compartments

CompartmentNominal temperature(25 – Tc)/20
Other compartmentDesign temperature
$${\frac{25 - T _{c}}{20}}$$
Cellar compartment/Wine storage compartment+ 12 °C0,65
Fresh-food storage compartment+ 5 °C1,00
Chill compartment0 °C1,25
Ice-making compartment and 0-star compartment0 °C1,25
One-star compartment– 6 °C1,55
Two-star compartment– 12 °C1,85
Three-star compartment– 18 °C2,15
Food freezer compartment (four-star compartment)– 18 °C2,15

Notes:

1. for multi-use compartments, the thermodynamic factor is determined by the nominal temperature as given in Table 2 of the coldest compartment type capable of being set by the end-user and maintained continuously according to the manufacturer’s instructions;
1. for any two-star section (within a freezer) the thermodynamic factor is determined at Tc = – 12 °C;
1. for other compartments the thermodynamic factor is determined by the coldest design temperature capable of being set by the end-user and maintained continuously according to the manufacturer’s instructions.
Table 6

### Value of the correction factors

Correction factorValueConditions
FF (Frost-free)1,2For frost-free frozen-food storage compartments
1Otherwise
CC (climate class)1,2For T class (tropical) appliances
1,1For ST class (subtropical) appliances
1Otherwise
BI (built-in)1,2For built-in appliances under 58 cm in width
1Otherwise

Notes:

1. FF is the volume correction factor for frost-free compartments.
1. CC is the volume correction factor for a given climate class. If a refrigerating appliance is classified in more than one climate class, the climate class with the highest correction factor is used for the calculation of the equivalent volume.
1. BI is the volume correction factor for built-in appliances.

### 3.CALCULATION OF THE ENERGY EFFICIENCY INDEX

For the calculation of the Energy Efficiency Index (EEI), of a household refrigerating appliance model, the Annual Energy Consumption of the household refrigerating appliance is compared to its Standard Annual Energy Consumption.

1. The Energy Efficiency Index (EEI) is calculated and rounded to the first decimal place, as:

$${\mathrm{EEI}} = {{\frac{\mathrm{AE} _{c}}{\mathrm{SAE} _{c}}} \times 100}$$

where:

2. The Annual Energy Consumption (AEC) is calculated in kWh/year and rounded to two decimal places, as:

AEc = E24h × 365

where:

3. The Standard Annual Energy Consumption (SAEC) is calculated in kWh/year and rounded to two decimal places, as:

SAEc = Veq × M + N + CH

where:

Table 7

CategoryMN
10,233245
20,233245
30,233245
40,643191
50,450245
60,777303
70,777303
80,539315
90,472286
10(4)(5)