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  2. Freeze stat - Wikipedia

    en.wikipedia.org/wiki/Freeze_stat

    Air coil freeze stat. A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing.Freeze stats can be used on both refrigerant-to-air, and refrigerant-to-liquid type heat exchangers and serve different purposes with similar goals for each.

  3. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  4. Antifreeze - Wikipedia

    en.wikipedia.org/wiki/Antifreeze

    It however has only a 100 Kelvin liquid range, and it expands upon freezing. To address these problems, alternative coolants with improved properties were developed. Freezing and boiling points are colligative properties of a solution, which depend on the concentration of dissolved substances. Salts lower the melting points of aqueous solutions.

  5. 20 Cleaning Products That Are a Complete Waste of Money - AOL

    www.aol.com/20-cleaning-products-complete-waste...

    Why they're a waste: No one likes the thought of breathing in dirty air, but filter-free air purifiers that rely on ionizers simply don't effectively trap and remove allergens, experts say. Worse ...

  6. World Refrigeration Day - Wikipedia

    en.wikipedia.org/wiki/World_Refrigeration_Day

    World Refrigeration Day is an international day established by the World Refrigeration Day Secretariat in Derbyshire, England.Held annually on 26 June, it was created to raise awareness about the importance of refrigeration technologies in everyday life and to raise the profile of the refrigeration, air-conditioning and heat-pump sector. [1]

  7. Chiller - Wikipedia

    en.wikipedia.org/wiki/Chiller

    A liquid (glycol based) chiller with an air cooled condenser on the rooftop of a medium size commercial building. In air conditioning systems, chilled coolant, usually chilled water mixed with ethylene glycol, from a chiller in an air conditioning or cooling plant is typically distributed to heat exchangers, or coils, in air handlers or other types of terminal devices which cool the air in ...

  8. Condenser (heat transfer) - Wikipedia

    en.wikipedia.org/wiki/Condenser_(heat_transfer)

    For example, a refrigerator uses a condenser to get rid of heat extracted from the interior of the unit to the outside air. Condensers are used in air conditioning, industrial chemical processes such as distillation, steam power plants, and other heat-exchange systems. The use of cooling water or surrounding air as the coolant is common in many ...

  9. 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.