Division 3 Determination of the AE:

For all refrigerating appliances, except for low noise refrigerating appliances:

The energy consumption shall be determined by testing at an ambient temperature of 16 °C and 32 °C.

To determine the energy consumption, the average air temperatures in each compartment shall be equal to or below the target temperatures specified in Table 3 for each compartment type claimed by the supplier. Values above and below target temperatures may be used to estimate the energy consumption at the target temperature for each relevant compartment by interpolation, as appropriate.

The main components of energy consumption to be determined are:

• a set of steady state power consumption values (P_ss ) in W and rounded to one decimal place, each at a specific ambient temperature and at a set of compartment temperatures, which are not necessarily the target temperatures;

• the representative incremental defrost and recovery energy consumption (ΔΕ_d-f), in Wh and rounded to one decimal place, for products with one or more auto-defrost systems (each with its own defrost control cycle) measured at an ambient temperature of 16 °C (ΔΕ_d-f16) and 32 °C (ΔΕ_d-f32);

• defrost interval (t_d-f ), expressed in h and rounded to three decimal places, for products with one or more defrost systems (each with its own defrost control cycle) measured at an ambient temperature of 16 °C (t_d-f16 ) and 32 °C (t_d-f32 ). t_d-f shall be determined for each system under a certain range of conditions;

• for each test performed the P_ss and ΔΕ^d-f are added together to form a daily energy consumption at a certain ambient temperature E_T = 0,001 × 24 × (P_ss + ΔΕ_d-f/t_d-f ), expressed in kWh/24h, specific to the settings applied;

• E_aux , expressed in kWh/a and rounded to three decimal places. E_aux is limited to the ambient controlled anti-condensation heater and is determined from the heater’s power consumption at a number of ambient temperature and humidity conditions, multiplied with the probability that this ambient temperature and humidity condition occurs and summed; this result is subsequently multiplied with a loss factor to account for heat leakage into the compartment and its subsequent removal by the refrigeration system.

  Table 3
  Storage conditions and target temperature per compartment type
  Notes
  Tmin and Tmax are the average values measured over the test period (average over time and over a set of sensors).
  The average temperature variation over the test period for each sensor shall be no more than ± 0,5 kelvin (K). During a defrost and recovery period the average of all sensors is not permitted to rise more than 1,5 K above the average value of the compartment.
  Tmin and Tmax are instantaneous values during the test period.
  Tmax is the maximum value measured over the test period (maximum over time and over a set of sensors).
  If the compartment is of the auto-defrosting type, the temperature (defined as the maximum of all sensors) is not permitted to rise more than 3,0 K during a defrost and recovery period.
  Tmin and Tmax are the average values measured over the test period (average over time for each sensor) and define the maximum allowed temperature operating range
  n.a.=not applicable
  Group	Compartment type	Note	Storage conditions		Tc
  			Tmin	Tmax
  Name	Name	no.	°C	°C	°C
  Unfrozen compartments	Pantry	f1	+14	+20	+17
  	Wine storage	f2f3	+5	+20	+12
  	Cellar		+2	+14	+12
  	Fresh food		0	+8	+4
  Chill compartment	Chill	f4	-3	+3	+2
  Frozen compartments	0-star & ice-making	f5	n.a.	0	0
  	1-star		n.a.	-6	-6
  	2-star	f6	n.a.	-12	-12
  	3-star		n.a.	-18	-18
  	freezer (4-star)		n.a.	-18	-18

  Each of these parameters shall be determined through a separate test or set of tests. Measurement data is averaged over a test period which is taken after the appliance has been in operation for a certain time. To improve the efficiency and accuracy of testing, the length of the test period shall not be fixed; it shall be such that the appliance is in steady state condition during this test period. This is validated by examining all data within this test period against a set of stability criteria and whether enough data could be collected in this steady state.

  AE, expressed in kWh/a and rounded to two decimal places, shall be calculated as follows:

  AE = 365 × E_daily /L + E_aux

  with

• the load factor L = 0,9 for refrigerating appliances with only frozen compartments and L = 1,0 for all other appliances; and

• with E_daily, expressed in kWh/24h and rounded to three decimal places calculated from E_T at an ambient temperature of 16 °C (E₁₆ ) and at an ambient temperature of 32 °C (E₃₂ ) as follows:

  E_daily = 0,5 × (E₁₆ + E₃₂ )

  where E₁₆ and E₃₂ are derived by interpolation of the energy test at the target temperatures set out in Table 3.

For low noise refrigerating appliances:

The energy consumption shall be determined as provided for in point 3(a), but at an ambient temperature of 25 °C instead of at 16 °C and 32 °C.

E_daily , expressed in kWh/24h and rounded to three decimal places for the calculation of the AE is then as follows:

E_daily = E₂₅

where E₂₅ is E_T at an ambient temperature of 25 °C and derived by interpolation of the energy tests at the target temperatures listed in Table 3.