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Air-conditioner sizes are often given as "tons" of cooling, where 1 ton of cooling equals 12,000 BTU/h (3.5 kW). 1 ton of cooling equals the amount of power that needs to be applied continuously over a 24-hour period to melt 1 ton of ice. The annual cost of electric energy consumed by an air conditioner may be calculated as follows:
It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours. [ 1 ] [ 2 ] The modern definition is exactly 12,000 Btu IT /h (3.516853 kW ).
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
The levelized cost of electricity (LCOE) is a metric that attempts to compare the costs of different methods of electricity generation consistently. Though LCOE is often presented as the minimum constant price at which electricity must be sold to break even over the lifetime of the project, such a cost analysis requires assumptions about the value of various non-financial costs (environmental ...
Following the international credit crisis and spikes in crude oil prices, Pakistan's economy could not withstand the pressure, and on 11 October 2008, the State Bank of Pakistan reported that the country's foreign exchange reserves had gone down by $571.9 million to $7,749.7 million. [64]
The $51 estimate was lower than the European Union's carbon price but higher than the Chinese carbon price. [53] Additionally, the administration set the social cost of methane at $1,500 per tonne. [54] In March 2022, the court allowed the Biden administration to use the social cost of carbon, thus reversing a previous court ruling. [55]
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