Cool storage in private homes (Opbevaring på køl i private hjem)


Process description       

The present data refer cool storage in modern household refrigerators and freezers in Denmark. The considered refrigerators are build-in type and do not provide other functions than cooling. All considered freezers are up-right type and do not provide other functions than freezing.

Data collection and treatment

Producers of cooling equipment for private households provide information about electricity consumption per year as well as capacity in terms of internal storage volume. This information has been collected by NVE for a number of brands and put together in at table in order to identify energy marks for various products available in the Danish market.  

The electricity consumption for a given product Ep can be roughly estimated by following formula:

Ep = Ed/SC × 100%/u × Vp × t


Ed is the electricity consumption of the refrigerator or freezer (kWh per day)

SC is the storage capacity of the refrigerator or freezer (litres)

u is the degree of utilisation of the refrigerator (%)

Vp is the volume of the considered product (litres)

t is the time of the storage (days) and

Ed/SC = Evd (the daily electricity consumption per l storage capacity, wh per liter per day).

Technical scope

Electricity consumption for maintaining the cool is included. Cooling from room temperature to storage temperature has not been taken into account. Saving of house heating during winter time due to heat production from the cooling aggregate has not been taken into account. Other inputs and outputs have not been included.


Energy consumption for cool storage in private households has decreased significantly during the last decades and since the data are derived from new equipment (2002) the present data are only representative to new equipment. The data do only represent a small selection of equipment with different capacity and energy mark.


Electricity consumption for cool storage per unit of stored product is determined by five main factors: the storage temperature and room temperature, the daily praxis of the user, the applied cooling technology, the condition of the equipment and the utilisation of the cooling capacity and electricity consumption can vary a lot depending on the actual conditions. The present the data are measured under standard conditions and do only provide an order of magnitude of electricity consumption.

Electricity consumption

Electricity consumption and storage capacity of various refrigerators and freezers available in the Danish market in 2002.
  Energy mark Storage
Capacity, SC
Electricity consumption, Ed kWh per day Electricity consumption, Evd
Wh per litre per day
Refrigerators A 145 0.39 2.7
B 146 0.57 3.9
C 146 0.65 4.5
A 251 0.45 1.8
B 257 0.59 2.3
C 255 0.70 2.7
Freezers A 95 0.57 6.0
B 94 0.77 8.2
C 90 0.90 10
D 93 1.03 11
A 263 0.82 3.1
B 263 1.11 4.2
C 269 1.34 5.0


Markedsoversigt med EU's energimærkning: Fryseskabe, indbygning. Can be obtained from NVE. In Danish.

Markedsoversigt med EU's energimærkning: Køle-/svaleskabe, indbygning. Can be obtained from NVE. In Danish.

Administrative information:

Data URL:
Version no.: 1.00
Authors: Per H. Nielsen,
2.-0 LCA consultants.
Data entry: Data have been entered in this format by Per H. Nielsen.

Data completed: July 2003.