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Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...
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]
1 ton of cooling, a common unit in North American refrigeration and air conditioning applications, is 12,000 Btu/h (3.52 kW). It is the rate of heat transfer needed to freeze 1 short ton (907 kg) of water into ice in 24 hours.
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Air pollution from coal storage and handling costs the US almost 200 dollars for every extra ton stored, due to PM2.5. [183] Coal pollution costs the €43 billion each year. [ 184 ] Measures to cut air pollution benefit individuals financially and the economies of countries [ 185 ] [ 186 ] such as China.
An estimate of 2.2–3 tons of copper slag is generated per ton of copper produced, resulting in around 24.6 tons of slag per year, which is regarded as waste. [36] [37] Environmental impact of slag include copper paralysis, which leads to death due to gastric hemorrhage, if ingested by humans. It may also cause acute dermatitis upon skin exposure.
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