ABSTRACT
The main role of refrigerators and freezers is similar to that of houses themselves to maintain a temperature difference between the exterior and the interior. For the purposes of the present calculations both types are considered together as one average type of freezer, with a storage volume of 0.25m3 at a temperature of -20°C. Most of what is said about refrigerators applies to freezers too, except that automatic defrosting is not used in freezers. While insulation has always been thicker in freezers than in refrigerators, increased insulation is still the major possibility for electricity saving. Washing machines belong to a group of appliances (including dishwashers and clothes dryers) in which most of the electricity consumed is used to produce low temperature heat (below 100 C), by means of resistance heating elements.
