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For refrigerating appliances, such as refrigerators, freezers, wine-storage appliances, and combined appliances, the labelling is specified in terms of an energy efficiency index EEI, which is an indication of the annual power consumption relative to a reference consumption that is based on the storage volume and the type of appliance (refrigerator or freezer).
Depending on the volume of the freezer, the opening frequency of the users as well as the number of samples, the energy consumption starts from ca. 11 kWh/day and higher. The US government calculates 20 kWh/day. [12] A study performed at the University of Edinburgh showed that the New Brunswick U570 HEF model consumed slightly under 10 kWh/day ...
The most energy-efficient unit made in the US consumes about half a kilowatt-hour per day (equivalent to 20 W continuously). [41] But even ordinary units are reasonably efficient; some smaller units use less than 0.2 kWh per day (equivalent to 8 W continuously).
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. [ 1 ] [ 2 ] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.
The energy consumption figure is an estimate of how much energy (in kilowatt-hours or kWh) the appliance will use over a year, based on assumptions about "average usage". However, actual energy consumption will depend on how an appliance is used and how often it is used.
For example, it is useful to compare the energy efficiency of household appliances whose power consumption varies with time or the season of the year. Another use is to measure the energy produced by a distributed power source. One kilowatt-hour per year equals about 114.08 milliwatts applied constantly during one year.
An EnergyGuide Label. The EnergyGuide provides consumers in the United States information about the energy consumption, efficiency, and operating costs of appliances and consumer products.
The US state of Louisiana had the highest annual electricity purchases per residential customer at 14,774 kWh and the US state of Hawaii had the lowest at 6,178 kWh per residential customer. [1] As of 2008, in an average household in a temperate climate, the yearly use of household energy is comprised as follows: