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  2. Kitchen hood - Wikipedia

    en.wikipedia.org/wiki/Kitchen_hood

    Ducted hoods blow the gases to the outdoors; ductless hoods filter the air, often using activated charcoal, to remove odor and smoke particles from the air and then release the cleaned air back into the kitchen. A ducted system removes of all forms of airborne contamination, while a ductless one recirculates heat and moisture.

  3. Heating, ventilation, and air conditioning - Wikipedia

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

    Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality .

  4. Cold district heating - Wikipedia

    en.wikipedia.org/wiki/Cold_district_heating

    Cold district heating is a technical variant of a district heating network that operates at low transmission temperatures well below those of conventional district heating systems and can provide both space heating and cooling. Transmission temperatures in the range of approx. 10 to 25 °C (50–77 °F) are common, allowing different consumers ...

  5. District cooling - Wikipedia

    en.wikipedia.org/wiki/District_cooling

    The district cooling plant is operated by SP Group's subsidiary, Singapore District Cooling. [17] A second district cooling plant was commissioned in May 2010, [17] which will supply chilled water for the air-conditioning of buildings in the area through pipes housed within the Common Services Tunnel in Marina Bay. The second district cooling ...

  6. Variable refrigerant flow - Wikipedia

    en.wikipedia.org/wiki/Variable_refrigerant_flow

    Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller-based systems.

  7. Demand controlled ventilation - Wikipedia

    en.wikipedia.org/wiki/Demand_controlled_ventilation

    Demand controlled ventilation (DCV) is a feedback control method to maintain indoor air quality that automatically adjusts the ventilation rate provided to a space in response to changes in conditions such as occupant number or indoor pollutant concentration.

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