The lengths we go to...
When it comes to testing freezers, it is important to find out how quickly each appliance will freeze a load of food placed inside and how long it will keep that food frozen in the event of a power cut.
In our labs, each freezer model is run in for at least 24 hours in a room in which the ambient temperature is 25°C.
Testers then load the freezer with gel packs - to which are fitted temperature sensors - to simulate the food that would typically be stored in these appliances. Tests involve measuring the length of time it takes for a heavy load (20kg/100l of net volume) and a light load (4kg/100l of net volume) of gel packs to reach -16°C and -18°C.
To gauge how well insulated the freezer is, our testers fill the freezer with gel packs and allow them to reach -18°C before turning off the power to simulate a power cut. Measurements are then taken for how long before the temperature rises to -9°C - the point at which food would need to be thrown away.