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  2. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    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 ...

  3. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    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]

  4. British thermal unit - Wikipedia

    en.wikipedia.org/wiki/British_thermal_unit

    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.

  5. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    Hot blast is a method of using heat from the blast furnace exhaust gas to preheat combustion air, saving a considerable amount of fuel. It allowed much higher furnace temperatures and increased the capacity of furnaces. Hot blast allowed blast furnaces to use anthracite or lower grade coal. Anthracite was difficult to light with cold blast.

  6. Austin, Texas - Wikipedia

    en.wikipedia.org/wiki/Austin,_Texas

    There were 276,842 dwelling units at an average density of 1,101 per square mile (425/km 2). There were 265,648 households, out of which 26.8% had children under the age of 18 living with them, 38.1% were married couples living together, 10.8% had a female householder with no husband present, and 46.7% were non-families. 32.8% of all households ...

  7. Coal - Wikipedia

    en.wikipedia.org/wiki/Coal

    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.

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