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A refrigerator sold today uses about 70% less electricity as one sold in 1970. [11] It has been estimated that these standards have saved American taxpayers over $300 Billion in energy savings. [11] Overall these standards have reduced total American energy use by 3.6%, or about 3.6 quadrillion BTU"s every year.
The per capita data for many countries may be slightly inaccurate as population data may not be for the same year as the consumption data. Population data were obtained mainly from the IMF [ 3 ] in 2021 with some exceptions, in which case they were obtained from the Wikipedia pages for the corresponding countries/territories.
(72,000 BTU/h) × (1000 h/year) × ($0.12/kW·h) ÷ (10 BTU/W·h) ÷ (1000 W/kW) = $860/year. Example 2. A residence near Chicago has an air conditioner with a cooling capacity of 4 tons and an SEER rating of 10. The unit is operated 120 days each year for 8 hours per day (960 hours per year), and the electric energy cost is $0.10 per kilowatt ...
But even ordinary units are reasonably efficient; some smaller units use less than 0.2 kWh per day (equivalent to 8 W continuously). Larger units, especially those with large freezers and icemakers, may use as much as 4 kW·h per day (equivalent to 170 W continuously).
The COP of absorption chillers can be improved by adding a second or third stage. Double and triple effect chillers are significantly more efficient than single effect chillers, and can surpass a COP of 1. They require higher pressure and higher temperature steam, but this is still a relatively small 10 pounds of steam per hour per ton of cooling.
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).
The data are given in kilograms of oil equivalent per year, and gigajoules per year, and in watts, as average equivalent power. Notes on conversions. 1 kg of oil equivalent (kgoe) = 11.63 kWh or 1 kWh = 0.08598 kgoe [2] 1000 kgoe = 42 GJ; 1 GJ/a = 31.7 W average; 1 W average = 8.76 kWh per year (365 × 24 Wh per year)
Standby power used by consumer electronics and appliances while they are turned off accounts for an estimated 5 to 10% of household electricity consumption, adding an estimated $3 billion to annual energy costs in the US. "In the average home, 75% of the electricity used to power home electronics is consumed while the products are turned off." [8]
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